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Eckstein F, Putz R, Wirth W. Sexual dimorphism in peri-articular tissue anatomy - More keys to understanding sex-differences in osteoarthritis? OSTEOARTHRITIS AND CARTILAGE OPEN 2024; 6:100485. [PMID: 38946793 PMCID: PMC11214405 DOI: 10.1016/j.ocarto.2024.100485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Accepted: 05/07/2024] [Indexed: 07/02/2024] Open
Abstract
Objective Osteoarthritis prevalence differs between women and men; whether this is the result of differences in pre-morbid articular or peri-articular anatomical morphotypes remains enigmatic. Albeit sex within humans cannot be reduced to female/male, this review focusses to the sexual dimorphism of peri-articular tissues, given lack of literature on non-binary subjects. Methods Based on a Pubmed search and input from experts, we selected relevant articles based on the authors' judgement of relevance, interest, and quality; no "hard" bibliometric measures were used to evaluate the quality or importance of the work. Emphasis was on clinical studies, with most (imaging) data being available for the knee and thigh. Results The literature on sexual dimorphism of peri-articular tissues is reviewed: 1) bone size/shape, 2) subchondral/subarticular bone, 3) synovial membrane and infra-patellar fad-pad (IPFP), 4) muscle/adipose tissue, and 5) peri-articular tissue response to treatment. Conclusions Relevant sex-specific differences exist for 3D bone shape and IPFP size, even after normalization to body weight. Presence of effusion- and Hoffa-synovitis is associated with greater risk of incident knee osteoarthritis in overweight women, but not in men. When normalized to bone size, men exhibit greater muscle, and women greater adipose tissue measures relative to the opposite sex. Reduced thigh muscle specific strength is associated with incident knee osteoarthritis and knee replacement in women, but not in men. These observations may explain why women with muscle strength deficits have a poorer prognosis than men with similar deficits. A "one size/sex fits all" approach must be urgently abandoned in osteoarthritis research.
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Affiliation(s)
- Felix Eckstein
- Research Program for Musculoskeletal Imaging, Center for Anatomy and Cell Biology, Paracelsus Medical University, Salzburg, Austria
- Ludwig Boltzmann Institute for Arthritis and Rehabilitation (LBIAR), Paracelsus Medical University, Salzburg, Austria
- Chondrometrics GmbH, Ainring, Germany
| | - Reinhard Putz
- Anatomische Anstalt, Ludwig Maximilians Universität München, Munich, Germany
| | - Wolfgang Wirth
- Research Program for Musculoskeletal Imaging, Center for Anatomy and Cell Biology, Paracelsus Medical University, Salzburg, Austria
- Ludwig Boltzmann Institute for Arthritis and Rehabilitation (LBIAR), Paracelsus Medical University, Salzburg, Austria
- Chondrometrics GmbH, Ainring, Germany
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Bashekah KA, Zagzoug ME, Banaja AW, Alghamdi AA, Mishiming OS, Jan MA, Kemawi OA, Alharbi BA, Althagafi AA, Aljifri SM. Prevalence and Characteristics of Knee Osteoarthritis Among the General Public in Saudi Arabia. Cureus 2023; 15:e47666. [PMID: 38021677 PMCID: PMC10670982 DOI: 10.7759/cureus.47666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/25/2023] [Indexed: 12/01/2023] Open
Abstract
Background Knee osteoarthritis (OA) is a chronic and progressive knee joint condition that is influenced by multiple factors. This research aims to examine the prevalence and characteristics of knee OA among the general public in Saudi Arabia. Methodology This cross-sectional online survey was conducted in September 2023 in Saudi Arabia. This research used a previously developed questionnaire to validate the diagnosis of OA, which was performed in accordance with the diagnostic criteria established by the American College of Rheumatology (ACR). The Western Ontario and McMaster Universities Arthritis Index questionnaire (WOMAC) was used to examine the severity and characteristics of knee OA patients. A binary logistic regression analysis was conducted to determine the variables that influence the severity of knee OA and the likelihood of developing OA. Results A total of 1,019 individuals participated in this study. Around one-third of the participants (34.5%) fulfilled the ACR criteria for knee OA diagnosis. Overall, the mean WOMAC score was 34.1 (18.8) out of 96, which represents 35.5% of the maximum obtainable score and demonstrates a low degree of knee OA severity. The mean pain sub-scale score was 7.4 (3.8) out of 20, which represents 37.0% of the maximum obtainable score and demonstrates a low level of pain intensity. The mean stiffness sub-scale score was 2.7 (1.8) out of 8, which represents 33.8% of the maximum obtainable score and demonstrates a low degree of stiffness in joints. The mean physical function sub-scale score was 24.0 (14.0) out of 68, which represents 35.3% of the maximum obtainable score and demonstrates a low level of physical function difficulty. Females, older participants (above 40 years), those with high body mass index (28.8 kg/cm2 and higher), non-smokers, those with comorbidities, those who did not practice daily physical activity, those who had a family history of knee OA, and those who suffered from flat feet, rheumatoid arthritis, gout, lupus, or back or hip pain were more likely to develop knee OA and have severe OA (p < 0.05). Conclusions The findings of this study demonstrated a significant prevalence rate of knee OA and highlighted a discrepancy between the rates obtained by diagnostic criteria and those determined through clinical diagnosis. Several significant factors that contribute to the development of OA encompass lifestyle choices such as food and exercise, familial predisposition, genetic influences, and the presence of comorbidities. To effectively tackle this intricate matter, it is imperative to adopt a patient-centered strategy and prioritize early intervention.
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Almhdie-Imjabbar A, Podsiadlo P, Ljuhar R, Jennane R, Nguyen KL, Toumi H, Saarakkala S, Lespessailles E. Trabecular bone texture analysis of conventional radiographs in the assessment of knee osteoarthritis: review and viewpoint. Arthritis Res Ther 2021; 23:208. [PMID: 34362427 PMCID: PMC8344203 DOI: 10.1186/s13075-021-02594-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 07/28/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Trabecular bone texture analysis (TBTA) has been identified as an imaging biomarker that provides information on trabecular bone changes due to knee osteoarthritis (KOA). Consequently, it is important to conduct a comprehensive review that would permit a better understanding of this unfamiliar image analysis technique in the area of KOA research. We examined how TBTA, conducted on knee radiographs, is associated to (i) KOA incidence and progression, (ii) total knee arthroplasty, and (iii) KOA treatment responses. The primary aims of this study are twofold: to provide (i) a narrative review of the studies conducted on radiographic KOA using TBTA, and (ii) a viewpoint on future research priorities. METHOD Literature searches were performed in the PubMed electronic database. Studies published between June 1991 and March 2020 and related to traditional and fractal image analysis of trabecular bone texture (TBT) on knee radiographs were identified. RESULTS The search resulted in 219 papers. After title and abstract scanning, 39 studies were found eligible and then classified in accordance to six criteria: cross-sectional evaluation of osteoarthritis and non-osteoarthritis knees, understanding of bone microarchitecture, prediction of KOA progression, KOA incidence, and total knee arthroplasty and association with treatment response. Numerous studies have reported the relevance of TBTA as a potential bioimaging marker in the prediction of KOA incidence and progression. However, only a few studies have focused on the association of TBTA with both OA treatment responses and the prediction of knee joint replacement. CONCLUSION Clear evidence of biological plausibility for TBTA in KOA is already established. The review confirms the consistent association between TBT and important KOA endpoints such as KOA radiographic incidence and progression. TBTA could provide markers for enrichment of clinical trials enhancing the screening of KOA progressors. Major advances were made towards a fully automated assessment of KOA.
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Affiliation(s)
- Ahmad Almhdie-Imjabbar
- EA 4708- I3MTO Laboratory, University of Orleans, Orleans, France
- Translational Medicine Research Platform, PRIMMO, Regional Hospital of Orleans, Orleans, France
| | - Pawel Podsiadlo
- Tribology Laboratory, School of Civil and Mechanical Engineering, Curtin University, Bentley, WA, 6102, Australia
| | | | - Rachid Jennane
- EA 4708- I3MTO Laboratory, University of Orleans, Orleans, France
- Translational Medicine Research Platform, PRIMMO, Regional Hospital of Orleans, Orleans, France
| | - Khac-Lan Nguyen
- EA 4708- I3MTO Laboratory, University of Orleans, Orleans, France
- Translational Medicine Research Platform, PRIMMO, Regional Hospital of Orleans, Orleans, France
| | - Hechmi Toumi
- EA 4708- I3MTO Laboratory, University of Orleans, Orleans, France
- Translational Medicine Research Platform, PRIMMO, Regional Hospital of Orleans, Orleans, France
- Department of Rheumatology, Regional Hospital of Orleans, Orleans, France
| | - Simo Saarakkala
- Physics and Technology, Research Unit of Medical Imaging, University of Oulu, Oulu, Finland
- Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland
| | - Eric Lespessailles
- EA 4708- I3MTO Laboratory, University of Orleans, Orleans, France.
- Translational Medicine Research Platform, PRIMMO, Regional Hospital of Orleans, Orleans, France.
- Department of Rheumatology, Regional Hospital of Orleans, Orleans, France.
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Conesa-Buendía FM, Mediero A, Fujikawa R, Esbrit P, Mulero F, Mahillo-Fernández I, Mues AOD. Beneficial effects of manually assisted chiropractic adjusting instrument in a rabbit model of osteoarthritis. Sci Rep 2020; 10:13237. [PMID: 32764579 PMCID: PMC7413258 DOI: 10.1038/s41598-020-70219-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 07/20/2020] [Indexed: 12/12/2022] Open
Abstract
Osteoarthritis (OA) is a degenerative disease characterized by injury of all joint tissues. Our previous study showed that in experimental osteoporosis, chiropractic manipulation (CM) exerts protective effects on bone. We here assessed whether CM might ameliorate OA by improving subchondral bone sclerosis, cartilage integrity and synovitis. Male New-Zealand rabbits underwent knee surgery to induce OA by anterior cruciate ligament injury. CM was performed using the chiropractic instrument ActivatorV 3 times/week for 8 weeks as follows: force 2 setting was applied to the tibial tubercle of the rabbit right hind limb (TM-OA), whereas the corresponding left hind limb received a false manipulation (FM-OA) consisting of ActivatorV firing in the air and slightly touching the tibial tubercle. After sacrifice, subchondral bone integrity was assessed in the tibiae by microCT and histology. Cartilage damage and synovitis were estimated by Mankin's and Krenn's scores, respectively, and histological techniques. Bone mineral density and content in both cortical and trabecular compartments of subchondral bone decreased in OA rabbits compared to controls, but partially reversed in the TM-OA group. Trabecular bone parameters in the latter group also showed a significant improvement compared to FM-OA group. Moreover RANKL, OPG, ALP and TRAP protein expression in subchondral bone significantly decreased in TM-OA rabbits with respect to FM-OA group. CM was associated with lower Mankin's and Krenn's scores and macrophage infiltrate together with a decreased protein expression of pro-inflammatory, fibrotic and angiogenic factors, in TM-OA rabbits with respect to FM-OA. Our results suggest that CM may mitigate OA progression by improving subchondral bone as well as cartilage and synovial membrane status.
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Affiliation(s)
- F M Conesa-Buendía
- Bone and Joint Research Unit, Institute of Health Research (IIS-Fundación Jiménez Díaz), Madrid, Spain
| | - A Mediero
- Bone and Joint Research Unit, Institute of Health Research (IIS-Fundación Jiménez Díaz), Madrid, Spain
| | - R Fujikawa
- Madrid College of Chiropractic-Real Centro Universitario Escorial-María Cristina, Paseo de los Alamillos, 2, 28200, San Lorenzo de El Escorial, Madrid, Spain
| | - P Esbrit
- Bone and Joint Research Unit, Institute of Health Research (IIS-Fundación Jiménez Díaz), Madrid, Spain
| | - F Mulero
- Molecular Imaging Unit, Spanish National Cancer Research Center (CNIO), Madrid, Spain
| | - I Mahillo-Fernández
- Epidemiology and Biostatistics Unit (IIS-Fundación Jiménez Díaz), Madrid, Spain
| | - Arantxa Ortega-De Mues
- Madrid College of Chiropractic-Real Centro Universitario Escorial-María Cristina, Paseo de los Alamillos, 2, 28200, San Lorenzo de El Escorial, Madrid, Spain.
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El-Gendy SAA, Alsafy MAM, Rutland CS, El-Khamary AN, Abu-Ahmed HM, El-Kammar MH. Morphological and Imaging Evaluation of the Metacarpophalangeal and Metatarsophalangeal Joints in Healthy and Lame Donkeys. J Equine Vet Sci 2019; 88:102904. [PMID: 32303299 DOI: 10.1016/j.jevs.2019.102904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 10/14/2019] [Accepted: 12/20/2019] [Indexed: 11/25/2022]
Abstract
The donkey is of socio-economic value yet imaging techniques in both healthy and abnormal limbs are a limiting factor in research and medicine. The objective was to determine anatomical features of both healthy and clinically abnormal donkey metacarpophalangeal and metatarsophalangeal joints (n = 13) using anatomical dissection, casting, X-ray and computed tomography. The joint capsule contained two palmar/plantar and two dorsal recesses. The proximal-palmar or plantar recess was larger than the distodorsal recess and potential sites of approaches to the recesses were determined. Soft tissue structures were distinguished using computed tomography at 300 mA, which was superior to 120 mA. This methodology gave better assessments of the synovial tendon sheath, joint recesses, and cruciate, collateral, and short sesamoidean ligaments. Computed tomography provided outstanding discrimination between the cortex and medulla of the third metacarpal, the proximal sesamoid bones, the proximal phalanx, and excellent details of the osseous structures. Although the joints appeared free from exostosis using X-ray; the position and extension of exostosis in pathologically affected donkeys (a novel finding) were revealed using computed tomography with 300 mA in comparison to 120 mA. The study also provided an anatomical record of the metacarpophalangeal and metatarsophalangeal joints using the latest technology, which could impact on clinical situations including anesthesia injection sites.
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Affiliation(s)
- Samir A A El-Gendy
- Faculty of Veterinary Medicine, Department of Anatomy and Embryology, Alexandria University, Alexandria, Egypt.
| | - Mohamed A M Alsafy
- Faculty of Veterinary Medicine, Department of Anatomy and Embryology, Alexandria University, Alexandria, Egypt
| | - Catrin Sian Rutland
- Faculty of Medicine, School of Veterinary Medicine and Science, University of Nottingham, Nottingham, UK.
| | - Ahmad N El-Khamary
- Faculty of Veterinary Medicine, Department of Surgery, Damanhur University, Damanhur, Egypt
| | - Howaida M Abu-Ahmed
- Faculty of Veterinary Medicine, Department of Surgery, Alexandria University, Alexandria, Egypt
| | - Mahmoud H El-Kammar
- Faculty of Veterinary Medicine, Department of Surgery, Alexandria University, Alexandria, Egypt
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Bone Density and Texture from Minimally Post-Processed Knee Radiographs in Subjects with Knee Osteoarthritis. Ann Biomed Eng 2019; 47:1181-1190. [PMID: 30767134 PMCID: PMC6453872 DOI: 10.1007/s10439-019-02227-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 02/06/2019] [Indexed: 11/25/2022]
Abstract
Plain radiography is the most common modality to assess the stage of osteoarthritis. Our aims were to assess the relationship of radiography-based bone density and texture between radiographs with minimal and clinical post-processing, and to compare the differences in bone characteristics between controls and subjects with knee osteoarthritis or medial tibial bone marrow lesions (BMLs). Tibial bone density and texture was evaluated from radiographs with both minimal and clinical post-processing in 109 subjects with and without osteoarthritis. Bone texture was evaluated using fractal signature analysis. Significant correlations (p < 0.001) were found in all regions (between 0.94 and 0.97) for calibrated bone density between radiographs with minimal and clinical post-processing. Correlations varied between 0.51 and 0.97 (p < 0.001) for FDVer texture parameter and between − 0.10 and 0.97 for FDHor. Bone density and texture were different (p < 0.05) between controls and subjects with osteoarthritis or BMLs mainly in medial tibial regions. When classifying healthy and osteoarthritic subjects using a machine learning-based elastic net model with bone characteristics, area under the receiver operating characteristics (ROCAUC) curve was 0.77. For classifying controls and subjects with BMLs, ROCAUC was 0.85. In conclusion, differences in bone density and texture can be assessed from knee radiographs when using minimal post-processing.
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Tsai PH, Wong CC, Chan WP, Lu TW. The value of MR T2* measurements in normal and osteoarthritic knee cartilage: effects of age, sex, and location. Eur Radiol 2019; 29:4514-4522. [DOI: 10.1007/s00330-018-5826-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 09/24/2018] [Accepted: 10/11/2018] [Indexed: 02/07/2023]
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Birch CE, Mensch KS, Desarno MJ, Beynnon BD, Tourville TW. Subchondral trabecular bone integrity changes following ACL injury and reconstruction: a cohort study with a nested, matched case-control analysis. Osteoarthritis Cartilage 2018; 26:762-769. [PMID: 29572129 PMCID: PMC5962427 DOI: 10.1016/j.joca.2018.02.905] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 01/31/2018] [Accepted: 02/27/2018] [Indexed: 02/02/2023]
Abstract
OBJECTIVE There is limited information regarding changes in bone architecture following anterior cruciate ligament (ACL) injury. The objective of this study was to evaluate differences in tibial fractal signature in the medial and lateral compartments following ACL injury and describe how these values change following ACL-reconstruction and return to activity. DESIGN This was a prospective cohort study with a nested case-control analysis. ACL-injured subjects and matched controls were evaluated at pre-surgical baseline and post ACL reconstruction follow-up at a mean of 46 months. Serial Fractal Dimensions (FD) of tibial subchondral bone architecture were calculated in medial and lateral regions of interest in the horizontal and vertical dimensions. RESULTS In the medial and lateral compartments, there were significant differences in the vertical FD signature for ACL-injured subjects at final follow-up, when compared to the contralateral healthy tibia (medial P < 0.0001; lateral P < 0.0001) and the control group (medial P = 0.01; lateral P < 0.0001). Similarly, in the lateral compartment, there were significant differences in the horizontal FD profile for ACL-injured subjects at final follow-up, when compared to the contralateral healthy tibia (P = 0.003) and the controls (P < 0.0001). There were no significant side-to-side differences in FDs among healthy control subjects in the medial or lateral compartments at baseline or final follow-up. CONCLUSION At 46-month follow-up, FD profiles are significantly different, and show an overall lower FD signature, for ACL-injured knees when compared to the contralateral healthy knee and uninjured controls. Additionally, this study provided the first side-to-side symmetry data of medial and lateral FD values in healthy controls.
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Affiliation(s)
- C E Birch
- University of Vermont, Department of Orthopaedics and Rehabilitation, San Antonio, TX, USA.
| | - K S Mensch
- University of Texas Health Science Center at San Antonio, Department of Orthopaedics, Burlington, VT, USA.
| | - M J Desarno
- University of Vermont, Department of Medical Biostatistics, Burlington, VT, USA.
| | - B D Beynnon
- University of Vermont, Department of Orthopaedics and Rehabilitation, San Antonio, TX, USA.
| | - T W Tourville
- University of Vermont, Department of Orthopaedics and Rehabilitation, San Antonio, TX, USA; University of Vermont, Department of Rehabilitation and Movement Science, Burlington, VT, USA.
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Chen Y, Hu Y, Yu YE, Zhang X, Watts T, Zhou B, Wang J, Wang T, Zhao W, Chiu KY, Leung FK, Cao X, Macaulay W, Nishiyama KK, Shane E, Lu WW, Guo XE. Subchondral Trabecular Rod Loss and Plate Thickening in the Development of Osteoarthritis. J Bone Miner Res 2018; 33:316-327. [PMID: 29044705 DOI: 10.1002/jbmr.3313] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Revised: 10/10/2017] [Accepted: 10/14/2017] [Indexed: 12/21/2022]
Abstract
Developing effective treatment for osteoarthritis (OA), a prevalent and disabling disease, has remained a challenge, primarily because of limited understanding of its pathogenesis and late diagnosis. In the subchondral bone, rapid bone loss after traumatic injuries and bone sclerosis at the advanced stage of OA are well-recognized hallmarks of the disease. Recent studies have further demonstrated the crucial contribution of subchondral bone in the development of OA. However, the microstructural basis of these bone changes has not been examined thoroughly, and the paradox of how abnormal resorption can eventually lead to bone sclerosis remains unanswered. By applying a novel microstructural analysis technique, individual trabecula segmentation (ITS), to micro-computed tomography (μCT) images of human OA knees, we have identified a drastic loss of rod-like trabeculae and thickening of plate-like trabeculae that persisted in all regions of the tibial plateau, underneath both severely damaged and still intact cartilage. The simultaneous reduction in trabecular rods and thickening of trabecular plates provide important insights to the dynamic and paradoxical subchondral bone changes observed in OA. Furthermore, using an established guinea pig model of spontaneous OA, we discovered similar trabecular rod loss and plate thickening that preceded cartilage degradation. Thus, our study suggests that rod-and-plate microstructural changes in the subchondral trabecular bone may play an important role in the development of OA and that advanced microstructural analysis techniques such as ITS are necessary in detecting these early but subtle changes. With emerging high-resolution skeletal imaging modalities such as the high-resolution peripheral quantitative computed tomography (HR-pQCT), trabecular rod loss identified by ITS could potentially be used as a marker in assessing the progression of OA in future longitudinal studies or clinical diagnosis. © 2017 American Society for Bone and Mineral Research.
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Affiliation(s)
- Yan Chen
- Bone Bioengineering Laboratory, Department of Biomedical Engineering, Columbia University, New York, NY, USA.,Department of Orthopedics and Traumatology, The University of Hong Kong, Hong Kong.,Department of Bone and Joint Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Yizhong Hu
- Bone Bioengineering Laboratory, Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Y Eric Yu
- Bone Bioengineering Laboratory, Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Xingjian Zhang
- Bone Bioengineering Laboratory, Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Tezita Watts
- Bone Bioengineering Laboratory, Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Bin Zhou
- Bone Bioengineering Laboratory, Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Ji Wang
- Bone Bioengineering Laboratory, Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Ting Wang
- Department of Orthopedics and Traumatology, The University of Hong Kong, Hong Kong
| | - Weiwei Zhao
- Department of Orthopedics and Traumatology, The University of Hong Kong, Hong Kong
| | - Kwong Yuen Chiu
- Department of Orthopedics and Traumatology, The University of Hong Kong, Hong Kong
| | - Frankie Kl Leung
- Department of Orthopedics and Traumatology, The University of Hong Kong, Hong Kong
| | - Xu Cao
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - William Macaulay
- Department of Orthopedic Surgery, New York University Langone/Hospital for Joint Diseases, New York, NY, USA
| | - Kyle K Nishiyama
- Division of Endocrinology, Department of Medicine, Columbia University, New York, NY, USA
| | - Elizabeth Shane
- Division of Endocrinology, Department of Medicine, Columbia University, New York, NY, USA
| | - William W Lu
- Department of Orthopedics and Traumatology, The University of Hong Kong, Hong Kong
| | - X Edward Guo
- Bone Bioengineering Laboratory, Department of Biomedical Engineering, Columbia University, New York, NY, USA
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Podsiadlo P, Nevitt MC, Wolski M, Stachowiak GW, Lynch JA, Tolstykh I, Felson DT, Segal NA, Lewis CE, Englund M. Baseline trabecular bone and its relation to incident radiographic knee osteoarthritis and increase in joint space narrowing score: directional fractal signature analysis in the MOST study. Osteoarthritis Cartilage 2016; 24:1736-1744. [PMID: 27163445 PMCID: PMC5482364 DOI: 10.1016/j.joca.2016.05.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 04/01/2016] [Accepted: 05/02/2016] [Indexed: 02/02/2023]
Abstract
PURPOSE To explore the association of baseline trabecular bone structure with incident tibiofemoral (TF) osteoarthritis (OA) and with increase in joint space narrowing (JSN) score. METHODS The Multicenter Osteoarthritis Study (MOST) includes subjects with or at risk for knee OA. Knee radiographs were scored for Kellgren-Lawrence (KL) grade and JSN at baseline, 30, 60 and 84 months. Knees (KL ≤ 1) at baseline were assessed for incident OA (KL ≥ 2) and increases in JSN score. For each knee image at baseline, a variance orientation transform method (VOT) was applied to subchondral tibial bone regions of medial and lateral compartments. Seventeen fractal parameters were calculated per region. Associations of each parameter with OA incidence and with medial and lateral JSN increases were explored using logistic regression. Analyses were stratified by digitized film (DF) vs computer radiography (CR) and adjusted for confounders. RESULTS Of 894 knees with CR and 1158 knees with DF, 195 (22%) and 303 (26%) developed incident OA. Higher medial bone roughness was associated with increased odds of OA incidence at 60 and 84 months and also, medial and lateral JSN increases (primarily vertical). Lower medial and lateral anisotropy was associated with increased odds of medial and lateral JSN increase. Compared to DF, CR had more associations and also, similar results at overlapping scales. CONCLUSION Baseline trabecular bone texture was associated with incident radiographic OA and increase of JSN scores independently of risk factors for knee OA. Higher roughness and lower anisotropy were associated with increased odds for radiographic OA change.
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Affiliation(s)
| | - M C Nevitt
- University of California San Francisco, San Francisco, CA, USA
| | - M Wolski
- Curtin University, Bentley, Australia
| | | | - J A Lynch
- University of California San Francisco, San Francisco, CA, USA
| | - I Tolstykh
- University of California San Francisco, San Francisco, CA, USA
| | - D T Felson
- Boston University School of Medicine, Boston, MA, USA
| | - N A Segal
- University of Iowa, Iowa City, IA, USA
| | - C E Lewis
- University of Alabama, Birmingham, AL, USA
| | - M Englund
- Boston University School of Medicine, Boston, MA, USA; Clinical Sciences Lund, Lund University, Lund, Sweden
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Anderson MJ, Diko S, Baehr LM, Baar K, Bodine SC, Christiansen BA. Contribution of mechanical unloading to trabecular bone loss following non-invasive knee injury in mice. J Orthop Res 2016; 34:1680-1687. [PMID: 26826014 PMCID: PMC5603199 DOI: 10.1002/jor.23178] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 01/28/2016] [Indexed: 02/04/2023]
Abstract
Development of osteoarthritis commonly involves degeneration of epiphyseal trabecular bone. In previous studies, we observed 30-44% loss of epiphyseal trabecular bone (BV/TV) from the distal femur within 1 week following non-invasive knee injury in mice. Mechanical unloading (disuse) may contribute to this bone loss; however, it is unclear to what extent the injured limb is unloaded following injury, and whether disuse can fully account for the observed magnitude of bone loss. In this study, we investigated the contribution of mechanical unloading to trabecular bone changes observed following non-invasive knee injury in mice (female C57BL/6N). We investigated changes in gait during treadmill walking, and changes in voluntary activity level using Open Field analysis at 4, 14, 28, and 42 days post-injury. We also quantified epiphyseal trabecular bone using μCT and weighed lower-limb muscles to quantify atrophy following knee injury in both ground control and hindlimb unloaded (HLU) mice. Gait analysis revealed a slightly altered stride pattern in the injured limb, with a decreased stance phase and increased swing phase. However, Open Field analysis revealed no differences in voluntary movement between injured and sham mice at any time point. Both knee injury and HLU resulted in comparable magnitudes of trabecular bone loss; however, HLU resulted in considerably more muscle loss than knee injury, suggesting another mechanism contributing to bone loss following injury. Altogether, these data suggest that mechanical unloading likely contributes to trabecular bone loss following non-invasive knee injury, but the magnitude of this bone loss cannot be fully explained by disuse. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1680-1687, 2016.
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Affiliation(s)
- Matthew J. Anderson
- University of California-Davis Medical Center, Department of Orthopaedic Surgery
| | - Sindi Diko
- University of California-Davis Medical Center, Department of Orthopaedic Surgery
| | - Leslie M. Baehr
- University of California-Davis, Department of Neurobiology, Physiology, and Behavior; Department of Physiology and Membrane Biology
| | - Keith Baar
- University of California-Davis, Department of Neurobiology, Physiology, and Behavior; Department of Physiology and Membrane Biology
| | - Sue C. Bodine
- University of California-Davis, Department of Neurobiology, Physiology, and Behavior; Department of Physiology and Membrane Biology
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12
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De Lasalle J, Alexander K, Olive J, Laverty S. COMPARISONS AMONG RADIOGRAPHY, ULTRASONOGRAPHY AND COMPUTED TOMOGRAPHY FOR EX VIVO CHARACTERIZATION OF STIFLE OSTEOARTHRITIS IN THE HORSE. Vet Radiol Ultrasound 2016; 57:489-501. [DOI: 10.1111/vru.12370] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Accepted: 01/28/2016] [Indexed: 01/12/2023] Open
Affiliation(s)
- Julie De Lasalle
- Department of Clinical Sciences, Faculty of Veterinary Medicine; University of Montreal; 3200 Sicotte, PO Box 5000 Saint-Hyacinthe QC Canada
- Comparative Orthopedic Research Laboratory, Faculty of Veterinary Medicine; University of Montreal; 3200 Sicotte, PO Box 5000 Saint-Hyacinthe J2S 7C6, QC Canada
| | - Kate Alexander
- Department of Clinical Sciences, Faculty of Veterinary Medicine; University of Montreal; 3200 Sicotte, PO Box 5000 Saint-Hyacinthe QC Canada
| | - Julien Olive
- Department of Clinical Sciences, Faculty of Veterinary Medicine; University of Montreal; 3200 Sicotte, PO Box 5000 Saint-Hyacinthe QC Canada
| | - Sheila Laverty
- Department of Clinical Sciences, Faculty of Veterinary Medicine; University of Montreal; 3200 Sicotte, PO Box 5000 Saint-Hyacinthe QC Canada
- Comparative Orthopedic Research Laboratory, Faculty of Veterinary Medicine; University of Montreal; 3200 Sicotte, PO Box 5000 Saint-Hyacinthe J2S 7C6, QC Canada
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13
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Amini M, Nazemi SM, Lanovaz JL, Kontulainen S, Masri BA, Wilson DR, Szyszkowski W, Johnston JD. Individual and combined effects of OA-related subchondral bone alterations on proximal tibial surface stiffness: a parametric finite element modeling study. Med Eng Phys 2016; 37:783-91. [PMID: 26074327 DOI: 10.1016/j.medengphy.2015.05.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Revised: 04/01/2015] [Accepted: 05/11/2015] [Indexed: 10/23/2022]
Abstract
The role of subchondral bone in OA pathogenesis is unclear. While some OA-related changes to morphology and material properties in different bone regions have been described, the effect of these alterations on subchondral bone surface stiffness has not been investigated. The objectives of this study were to characterize the individual (Objective 1) and combined (Objective 2) effects of OA-related morphological and mechanical alterations to subchondral and epiphyseal bone on surface stiffness of the proximal tibia. We developed and validated a parametric FE model of the proximal tibia using quantitative CT images of 10 fresh-frozen cadaveric specimens and in situ macro-indentation testing. Using this validated FE model, we estimated the individual and combined roles of OA-related alterations in subchondral cortical thickness and elastic modulus, and subchondral trabecular and epiphyseal trabecular elastic moduli on local surface stiffness. A 20% increase in subchondral cortical or subchondral trabecular elastic moduli resulted in little change in stiffness (1% increase). A 20% reduction in epiphyseal trabecular elastic modulus, however, resulted in an 11% reduction in stiffness. Our parametric analysis suggests that subchondral bone stiffness is affected primarily by epiphyseal trabecular bone elastic modulus rather than subchondral cortical and trabecular morphology or mechanical properties. Our results suggest that observed OA-related alterations to epiphyseal trabecular bone (e.g., lower mineralization, bone volume fraction, density and elastic modulus) may contribute to OA proximal tibiae being less stiff than normal.
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Affiliation(s)
- Morteza Amini
- Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, S7N 1G9, Canada
| | - S Majid Nazemi
- Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, S7N 1G9, Canada
| | - Joel L Lanovaz
- College of Kinesiology, University of Saskatchewan, Saskatoon, Canada
| | - Saija Kontulainen
- College of Kinesiology, University of Saskatchewan, Saskatoon, Canada
| | - Bassam A Masri
- Department of Orthopedics and Centre for Hip Health and Mobility, University of British Columbia, Vancouver, Canada
| | - David R Wilson
- Department of Orthopedics and Centre for Hip Health and Mobility, University of British Columbia, Vancouver, Canada
| | - Walerian Szyszkowski
- Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, S7N 1G9, Canada
| | - James D Johnston
- Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, S7N 1G9, Canada.
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14
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Hudelmaier M, Wirth W. Differences in subchondral bone size after one year in osteoarthritic and healthy knees. Osteoarthritis Cartilage 2016; 24:623-30. [PMID: 26564574 PMCID: PMC5572564 DOI: 10.1016/j.joca.2015.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 09/25/2015] [Accepted: 11/02/2015] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Increase of subchondral bone area (tAB) in OA has been reported, but it remains unclear if this is specific to OA. We investigated differences in knee tAB after one year in healthy subjects and in those with radiographic OA (rOA). METHOD MR images of 899 right knees from the OA Initiative were acquired at baseline and one year follow-up (year-1). Medial and lateral tibial cartilage (MT and LT) and weight-bearing femoral cartilage (cMF and cLF) were segmented and tAB computed. Subjects were stratified into: healthy controls, pre-rOA (K&L grades 0 and 1, with OA risk factors), established rOA (K&L grades 2-4), and independently with regards to joint space narrowing (without, with medial, lateral and bilateral JSN). Primary analysis tested if tAB was different between baseline and year-1 in rOA. Exploratory analyses investigated whether: (1) tAB changes differed between healthy controls and those with rOA; (2) tAB differences were greater in higher K&L grades; and (3) tAB was different between baseline and year-1 in JSN. Significance was set at P < 0.0125. RESULTS Differences in tAB were found in rOA in MT, cMF and cLF (ranging from +0.2% to +0.4%; P < 0.001), but not in healthy controls or pre-rOA. Rates of change did not differ between groups. Within the JSN groups differences of 0.2-0.4% were found in the femur (P < 0.05). CONCLUSION We find that knee tABs differ in rOA between baseline and year-1, but the change was not greater than in healthy knees, and is restricted to the femur in JSN.
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Affiliation(s)
- Martin Hudelmaier
- Institute of Anatomy & Musculoskeletal Research, Paracelsus Medical University (PMU) Salzburg, Austria,Chondrometrics GmbH, Ainring, Germany
| | - Wolfgang Wirth
- Institute of Anatomy & Musculoskeletal Research, Paracelsus Medical University (PMU) Salzburg, Austria,Chondrometrics GmbH, Ainring, Germany
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15
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MacKay JW, Murray PJ, Kasmai B, Johnson G, Donell ST, Toms AP. MRI texture analysis of subchondral bone at the tibial plateau. Eur Radiol 2015; 26:3034-45. [PMID: 26679180 DOI: 10.1007/s00330-015-4142-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 11/23/2015] [Accepted: 11/27/2015] [Indexed: 12/20/2022]
Abstract
OBJECTIVES To determine the feasibility of MRI texture analysis as a method of quantifying subchondral bone architecture in knee osteoarthritis (OA). METHODS Asymptomatic subjects aged 20-30 (group 1, n = 10), symptomatic patients aged 40-50 (group 2, n = 10) and patients scheduled for knee replacement aged 55-85 (group 3, n = 10) underwent high spatial resolution T1-weighted coronal 3T knee MRI. Regions of interest were created in the medial (MT) and lateral (LT) tibial subchondral bone from which 20 texture parameters were calculated. T2 mapping of the tibial cartilage was performed in groups 1 and 2. Mean parameter values were compared between groups using ANOVA. Linear discriminant analysis (LDA) was used to evaluate the ability of texture analysis to classify subjects correctly. RESULTS Significant differences in 18/20 and 12/20 subchondral bone texture parameters were demonstrated between groups at the MT and LT respectively. There was no significant difference in mean MT or LT cartilage T2 values between group 1 and group 2. LDA demonstrated subject classification accuracy of 97 % (95 % CI 91-100 %). CONCLUSION MRI texture analysis of tibial subchondral bone may allow detection of alteration in subchondral bone architecture in OA. This has potential applications in understanding OA pathogenesis and assessing response to treatment. KEY POINTS • Improved techniques to monitor OA disease progression and treatment response are desirable • Subchondral bone (SB) may play significant role in the development of OA • MRI texture analysis is a method of quantifying changes in SB architecture • Pilot study showed that this technique is feasible and reliable • Significant differences in SB texture were demonstrated between individuals with/without OA.
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Affiliation(s)
- James W MacKay
- Radiology Academy, Department of Radiology, Norfolk & Norwich University Hospital, Colney Lane, Norwich, Norfolk, NR4 7UB, UK.
| | - Philip J Murray
- Radiology Academy, Department of Radiology, Norfolk & Norwich University Hospital, Colney Lane, Norwich, Norfolk, NR4 7UB, UK
| | - Bahman Kasmai
- Radiology Academy, Department of Radiology, Norfolk & Norwich University Hospital, Colney Lane, Norwich, Norfolk, NR4 7UB, UK
| | - Glyn Johnson
- Radiology Academy, Department of Radiology, Norfolk & Norwich University Hospital, Colney Lane, Norwich, Norfolk, NR4 7UB, UK.,Norwich Medical School, University of East Anglia, Norwich, UK
| | - Simon T Donell
- Norwich Medical School, University of East Anglia, Norwich, UK.,Department of Trauma & Orthopaedics, Norfolk & Norwich University Hospital, Norwich, UK
| | - Andoni P Toms
- Radiology Academy, Department of Radiology, Norfolk & Norwich University Hospital, Colney Lane, Norwich, Norfolk, NR4 7UB, UK.,Norwich Medical School, University of East Anglia, Norwich, UK
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16
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Roemer FW, Jarraya M, Niu J, Duryea J, Lynch JA, Guermazi A. Knee joint subchondral bone structure alterations in active athletes: a cross-sectional case-control study. Osteoarthritis Cartilage 2015; 23:2184-2190. [PMID: 26187571 DOI: 10.1016/j.joca.2015.07.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 06/12/2015] [Accepted: 07/07/2015] [Indexed: 02/02/2023]
Abstract
OBJECTIVE It has been shown that trabecular bone structure parameters extracted from radiographs known as fractal signature analysis (FSA) are able to predict structural outcomes such as radiographic osteoarthritis (OA) progression. Little is known about their involvement in early disease or about differences between subjects exposed to increased joint loading such as young active athletes compared to non-athletes. Aim was to compare horizontal and vertical dimensions of bone texture considering athlete status, gender, previous anterior cruciate ligament (ACL) surgery and age. DESIGN Included were 685 patients of which 135 consecutive athletes (82% soccer players) 18-36 years old and 550 non-athletes controls in the same age range had knee radiography for assessment of subacute or chronic knee complaints. Regions of interest (ROI) were placed in the subchondral medial and lateral tibial plateaus. Fractal signatures were calculated in the horizontal and vertical dimensions. Curve fitting algorithms were applied taking into account all four risk factors in the same model adjusting for each other. RESULTS For the horizontal dimensions significant differences were observed for gender (estimate (E) 0.098 (95% confidence interval(CI)) (-0.009, 0.008), P < .0001), previous ACL surgery (E -0.031, 95% CI (-0.043, -0.019), P < .0001) and highest age group (E -0.039, 95% CI (-0.048, -0.029), P < .0001). For vertical dimensions, significant differences were shown for athletes (E -0.012, 95% CI (-0.020, -0.004), P < .0001), gender (E 0.056, 95% CI (0.049, 0.062), P < .0001), and age range from 28 to 32 years (E -0.028, 95% CI (-0.037, -0.019), P < .0001). CONCLUSIONS Trabecular bone structure differs between athletes and non-athletes, in regard to previous ACL surgery, gender and higher age.
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Affiliation(s)
- F W Roemer
- Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar; Quantitative Imaging Center (QIC), Department of Radiology, Boston University School of Medicine, Boston, MA, USA; Department of Radiology, University of Erlangen-Nuremberg, Erlangen, Germany.
| | - M Jarraya
- Quantitative Imaging Center (QIC), Department of Radiology, Boston University School of Medicine, Boston, MA, USA
| | - J Niu
- Clinical Epidemiology and Training Unit, Department of Medicine, Boston University School of Medicine, Boston, MA, USA
| | - J Duryea
- Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - J A Lynch
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USA
| | - A Guermazi
- Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar; Quantitative Imaging Center (QIC), Department of Radiology, Boston University School of Medicine, Boston, MA, USA
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17
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Hirvasniemi J, Thevenot J, Kokkonen HT, Finnilä MA, Venäläinen MS, Jämsä T, Korhonen RK, Töyräs J, Saarakkala S. Correlation of Subchondral Bone Density and Structure from Plain Radiographs with Micro Computed Tomography Ex Vivo. Ann Biomed Eng 2015; 44:1698-709. [PMID: 26369637 PMCID: PMC4696139 DOI: 10.1007/s10439-015-1452-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 09/04/2015] [Indexed: 12/01/2022]
Abstract
Osteoarthritis causes changes in the subchondral bone structure and composition. Plain radiography is a cheap, fast, and widely available imaging method. Bone tissue can be well seen from plain radiograph, which however is only a 2D projection of the actual 3D structure. Therefore, the aim was to investigate the relationship between bone density- and structure-related parameters from 2D plain radiograph and 3D bone parameters assessed from micro computed tomography (µCT) ex vivo. Right tibiae from eleven cadavers without any diagnosed joint disease were imaged using radiography and with µCT. Bone density- and structure-related parameters were calculated from four different locations from the radiographs of proximal tibia and compared with the volumetric bone microarchitecture from the corresponding regions. Bone density from the plain radiograph was significantly related with the bone volume fraction (r = 0.86; n = 44; p < 0.01). Mean homogeneity index for orientation of local binary patterns (HIangle,mean) and fractal dimension of vertical structures (FDVer) were related (p < 0.01) with connectivity density (HIangle,mean: r = −0.73, FDVer: r = 0.69) and trabecular separation (HIangle,mean: r = 0.73, FDVer: r = −0.70) when all ROIs were pooled together (n = 44). Bone density and structure in tibia from standard clinically available 2D radiographs are significantly correlated with true 3D microstructure of bone.
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Affiliation(s)
- Jukka Hirvasniemi
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, POB 5000, 90014, Oulu, Finland. .,Infotech Oulu, University of Oulu, Oulu, Finland.
| | - Jérôme Thevenot
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, POB 5000, 90014, Oulu, Finland
| | - Harri T Kokkonen
- Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
| | - Mikko A Finnilä
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, POB 5000, 90014, Oulu, Finland.,Department of Applied Physics, University of Eastern Finland, Kuopio, Finland.,Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Mikko S Venäläinen
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland.,Cancer Center, Kuopio University Hospital, Kuopio, Finland
| | - Timo Jämsä
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, POB 5000, 90014, Oulu, Finland.,Infotech Oulu, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland.,Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland
| | - Rami K Korhonen
- Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland.,Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
| | - Juha Töyräs
- Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland.,Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
| | - Simo Saarakkala
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, POB 5000, 90014, Oulu, Finland.,Infotech Oulu, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland.,Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland
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18
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Li G, Zheng Q, Landao-Bassonga E, Cheng TS, Pavlos NJ, Ma Y, Zhang C, Zheng MH. Influence of age and gender on microarchitecture and bone remodeling in subchondral bone of the osteoarthritic femoral head. Bone 2015; 77:91-7. [PMID: 25892484 DOI: 10.1016/j.bone.2015.04.019] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 04/09/2015] [Accepted: 04/12/2015] [Indexed: 12/22/2022]
Abstract
INTRODUCTION Age and gender have been reported to have a remarkable impact on bone homeostasis. However, subchondral bone, which plays a pivotal role in the initiation and progression of OA, has been poorly investigated. This study was to investigate age- and gender-related changes of microarchitecture and bone remodeling in subchondral bone in OA. METHODS Subchondral trabecular bone (STB) and deeper trabecular bone (DTB) specimens were extracted in the load-bearing region of femoral heads from 110 patients with OA. Micro-CT and histomorphometry were performed to analyze microarchitectural and bone remodeling changes of all specimens. RESULTS Compared to DTB, STB showed more sclerotic microarchitecture, more active bone remodeling and higher frequency of bone cysts. There were no gender differences for both microarchitecture and bone remodeling in STB. However, gender differences were found in DTB, with thinner Tb.Th, higher Tb.N, higher OS/BV and ES/BV in males. In both STB and DTB, no correlation between microarchitecture and age was found in both genders. However, bone remodeling of STB increased significantly with age in males, while bone remodeling of DTB increased significantly with age in females. No age or gender preference was found in subchondral bone cyst (SBC) frequency. The cyst volume fraction was correlated with neither age nor gender. CONCLUSIONS There were differences in microarchitecture and bone remodeling between STB and DTB, which may be due to the distinct biomechanical and biochemical functions of these two bone structures in maintaining joint homeostasis. OA changed the normal age- and gender-dependence of bone homeostasis in joints, in a site-specific manner.
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Affiliation(s)
- Guangyi Li
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China; Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia
| | - Qiujian Zheng
- Division of Orthopaedic Surgery, Guangdong General Hospital, Guangzhou, China
| | - Euphemie Landao-Bassonga
- Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia
| | - Tak S Cheng
- Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia
| | - Nathan J Pavlos
- Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia
| | - Yuanchen Ma
- Division of Orthopaedic Surgery, Guangdong General Hospital, Guangzhou, China
| | - Changqing Zhang
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.
| | - Ming H Zheng
- Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia.
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19
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Khorasani MS, Diko S, Hsia AW, Anderson MJ, Genetos DC, Haudenschild DR, Christiansen BA. Effect of alendronate on post-traumatic osteoarthritis induced by anterior cruciate ligament rupture in mice. Arthritis Res Ther 2015; 17:30. [PMID: 25888819 PMCID: PMC4355375 DOI: 10.1186/s13075-015-0546-0] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 01/26/2015] [Indexed: 12/30/2022] Open
Abstract
Introduction Previous studies in animal models of osteoarthritis suggest that alendronate (ALN) has antiresorptive and chondroprotective effects, and can reduce osteophyte formation. However, these studies used non-physiologic injury methods, and did not investigate early time points during which bone is rapidly remodeled prior to cartilage degeneration. The current study utilized a non-invasive model of knee injury in mice to investigate the effect of ALN treatment on subchondral bone changes, articular cartilage degeneration, and osteophyte formation following injury. Methods Non-invasive knee injury via tibial compression overload or sham injury was performed on a total of 90 mice. Mice were treated with twice weekly subcutaneous injections of low-dose ALN (40 μg/kg/dose), high-dose ALN (1,000 μg/kg/dose), or vehicle, starting immediately after injury until sacrifice at 7, 14 or 56 days. Trabecular bone of the femoral epiphysis, subchondral cortical bone, and osteophyte volume were quantified using micro-computed tomography (μCT). Whole-joint histology was performed at all time points to analyze articular cartilage and joint degeneration. Blood was collected at sacrifice, and serum was analyzed for biomarkers of bone formation and resorption. Results μCT analysis revealed significant loss of trabecular bone from the femoral epiphysis 7 and 14 days post-injury, which was effectively prevented by high-dose ALN treatment. High-dose ALN treatment was also able to reduce subchondral bone thickening 56 days post-injury, and was able to partially preserve articular cartilage 14 days post-injury. However, ALN treatment was not able to reduce osteophyte formation at 56 days post-injury, nor was it able to prevent articular cartilage and joint degeneration at this time point. Analysis of serum biomarkers revealed an increase in bone resorption at 7 and 14 days post-injury, with no change in bone formation at any time points. Conclusions High-dose ALN treatment was able to prevent early trabecular bone loss and cartilage degeneration following non-invasive knee injury, but was not able to mitigate long-term joint degeneration. These data contribute to understanding the effect of bisphosphonates on the development of osteoarthritis, and may support the use of anti-resorptive drugs to prevent joint degeneration following injury, although further investigation is warranted.
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Affiliation(s)
- Mohammad S Khorasani
- Department of Orthopaedic Surgery, University of California-Davis Medical Center, 4635 2nd Ave, Suite 2000, Sacramento, CA, 95817, USA.
| | - Sindi Diko
- Department of Orthopaedic Surgery, University of California-Davis Medical Center, 4635 2nd Ave, Suite 2000, Sacramento, CA, 95817, USA.
| | - Allison W Hsia
- Department of Orthopaedic Surgery, University of California-Davis Medical Center, 4635 2nd Ave, Suite 2000, Sacramento, CA, 95817, USA.
| | - Matthew J Anderson
- Department of Orthopaedic Surgery, University of California-Davis Medical Center, 4635 2nd Ave, Suite 2000, Sacramento, CA, 95817, USA.
| | - Damian C Genetos
- Department of Orthopaedic Surgery, University of California-Davis Medical Center, 4635 2nd Ave, Suite 2000, Sacramento, CA, 95817, USA.
| | - Dominik R Haudenschild
- Department of Orthopaedic Surgery, University of California-Davis Medical Center, 4635 2nd Ave, Suite 2000, Sacramento, CA, 95817, USA.
| | - Blaine A Christiansen
- Department of Orthopaedic Surgery, University of California-Davis Medical Center, 4635 2nd Ave, Suite 2000, Sacramento, CA, 95817, USA.
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20
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Li G, Ma Y, Cheng TS, Landao-Bassonga E, Qin A, Pavlos NJ, Zhang C, Zheng Q, Zheng MH. Identical subchondral bone microarchitecture pattern with increased bone resorption in rheumatoid arthritis as compared to osteoarthritis. Osteoarthritis Cartilage 2014; 22:2083-92. [PMID: 25205016 DOI: 10.1016/j.joca.2014.08.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 08/21/2014] [Accepted: 08/29/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVES To analyze the differences in microarchitecture and bone remodeling of subchondral bone in femoral heads from patients with rheumatoid arthritis (RA) and osteoarthritis (OA). DESIGNS Peri-articular bone samples, including subchondral trabecular bone (STB) and deeper trabecular bone (DTB) were extracted from the load-bearing region of femoral heads from 20 patients with RA and 40 patients with OA during hip replacement surgery. Micro-CT, histomorphometry and backscatter scanning electron microscopy (BSEM) were performed to assess microarchitecture and bone histology parameters. RESULTS In both RA and OA, STB showed more sclerotic microarchitecture and more active bone remodeling, compared to DTB. RA and OA showed similar microarchitecture characteristics in both STB and DTB, despite STB in RA exhibiting higher bone resorption. In addition, there was no difference in the frequency of bone cysts in STB between RA and OA. In STB, the trabecular bone surrounding subchondral bone cysts (Cys-Tb) was more sclerotic than the trabecular bone found distant to cysts (Peri-Tb), with a higher level of bone remodeling. Both Cys-Tb region and Peri-Tb region were detected to have similar microarchitectural and bone remodeling characteristics in RA and OA. CONCLUSIONS Apart from higher bone resorption in the general subchondral bone of RA samples, the peri-articular bone exhibited similar microarchitectural and bone remodeling characteristics in RA and OA.
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Affiliation(s)
- G Li
- Department of Orthopaedics, Shanghai Jiao Tong University Affiliated the Sixth People's Hospital, Shanghai, China; Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia.
| | - Y Ma
- Division of Orthopaedic Surgery, Guangdong General Hospital, Guangzhou, China.
| | - T S Cheng
- Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia.
| | - E Landao-Bassonga
- Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia.
| | - A Qin
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedics, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - N J Pavlos
- Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia.
| | - C Zhang
- Department of Orthopaedics, Shanghai Jiao Tong University Affiliated the Sixth People's Hospital, Shanghai, China.
| | - Q Zheng
- Division of Orthopaedic Surgery, Guangdong General Hospital, Guangzhou, China.
| | - M H Zheng
- Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Perth, Australia.
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Quantification of differences in bone texture from plain radiographs in knees with and without osteoarthritis. Osteoarthritis Cartilage 2014; 22:1724-31. [PMID: 25278081 PMCID: PMC4587537 DOI: 10.1016/j.joca.2014.06.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 05/26/2014] [Accepted: 06/22/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To quantify differences in bone texture between subjects with different stages of knee osteoarthritis (OA) and age- and gender-matched controls from plain radiographs using advanced image analysis methods. DESIGN Altogether 203 knees were imaged using constant X-ray parameters and graded according to Kellgren-Lawrence (KL) grading scale (KL0: n = 110, KL1: n = 28, KL2: n = 27, KL3: n = 31, KL4: n = 7). Bone density-related and structure-related parameters were calculated from medial and lateral tibial subchondral bone plate and trabecular bone and from femur. Density-related parameters were derived from grayscale values and structure-related parameters from Laplacian- and local binary patterns (LBP)-based images. RESULTS Reproducibilities of structure-related parameters were better than bone density-related parameters. Bone density-related parameters were significantly (P < 0.05) higher in KL2-4 groups than in control group (KL0) in medial tibial subchondral bone plate and trabecular bone. LBP-based structure parameters differed significantly between KL0 and KL2-4 groups in medial subchondral bone plate, between KL0 and KL1-4 groups in medial and lateral trabecular bone, and between KL0 and KL1-4/KL2-4 in medial and lateral femur. Laplacian-based parameters differed significantly between KL0 and KL2-4 groups in medial side regions-of-interest (ROIs). CONCLUSIONS Our results indicate that the changes in bone texture in knee OA can be quantitatively evaluated from plain radiographs using advanced image analysis. Based on the results, increased bone density can be directly estimated if the X-ray imaging conditions are constant between patients. However, structural analysis of bone was more reproducible than direct evaluation of grayscale values, and is therefore better suited for quantitative analysis when imaging conditions are variable.
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Effects of intra-articular clodronate in the treatment of knee osteoarthritis: results of a double-blind, randomized placebo-controlled trial. Rheumatol Int 2014; 35:255-63. [PMID: 25080876 DOI: 10.1007/s00296-014-3100-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 07/17/2014] [Indexed: 02/06/2023]
Abstract
Aim of this study was to evaluate the efficacy and tolerability of intra-articular (IA) clodronate, compared to saline solution, in patients with symptomatic knee osteoarthritis (KOA). In this double-blind phase 3 randomized clinical trial, patients were randomized to receive once weekly IA injection of 2 mg clodronate or placebo for 4 weeks with 12 weeks of follow-up. The primary objective was the sum of spontaneous, on passive movement, and at digital pressing pain relief assessed by visual analogue score (VAS) of 0-100 at 5 weeks after the final injection. Improving in Western Ontario MacMaster (WOMAC) scale, Lequesne index, consumption of acetaminophen, and physician or patient overall judgment were secondary objectives. Study population included 80 patients, 67 women and 13 men aged 66 ± 6 (SD) years. A significant improvement for all efficacy parameters was observed at all-time points in both groups. A significant difference in favor to clodronate in VAS for pain was observed 5 weeks after the last injection (-114.6 vs. -87.2 for clodronate and placebo group, respectively; p < 0.05). The improvements in Lequesne index, global KOA evaluation from both patients and investigators, and the WOMAC pain subscale were significantly greater in the clodronate group. The proportion of patients that did not require acetaminophen was significantly greater in the clodronate group (about 10 vs. 30 % for clodronate and placebo group, respectively; p < 0.05). IA 2 mg clodronate is associated with small and transient symptomatic and functional benefits and it is safe in KOA patients.
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Woloszynski T, Podsiadlo P, Stachowiak G, Kurzynski M. A dissimilarity-based multiple classifier system for trabecular bone texture in detection and prediction of progression of knee osteoarthritis. Proc Inst Mech Eng H 2013. [PMID: 23185959 DOI: 10.1177/0954411912456650] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
There is a growing need for classification systems that can accurately detect and predict knee osteoarthritis (OA) from plain radiographs. For this purpose, a system based on a support vector machine (SVM) classifier and distances measured between trabecular bone (TB) texture images was developed and tested in previous work. Unlike other systems, it allows an image classification without the calculation and selection of numerous texture features, and it is invariant to a range of imaging conditions encountered in a routine X-ray screening of knees. Although the system exhibited 85.4% classification accuracy in OA detection, which was higher than those obtained from other systems, its performance could be further improved. To achieve this, a dissimilarity-based multiple classifier (DMC) system is developed in this study. The system measures distances between TB texture images and generates a diverse ensemble of classifiers using prototype selection, bootstrapping of training set and heterogeneous classifiers. A measure of competence is used to select accurate (i.e. better-than-random) classifiers from the ensemble, which are then combined through the majority voting rule. To evaluate the newly developed system in OA detection (prediction of OA progression), TB texture images selected on standardised radiographs of healthy and OA (non-progressive and progressive OA) knees were used. The results obtained showed that the DMC system has higher classification accuracies for the detection (90.51% with 87.65% specificity and 93.33% sensitivity) and prediction (80% with 82.00% specificity and 77.97% sensitivity) than other systems, indicating its potential as a decision-support tool for the assessment of radiographic knee OA.
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Affiliation(s)
- Tomasz Woloszynski
- Tribology Laboratory, School of Mechanical and Chemical Engineering, The University of Western Australia, Perth, WA, Australia.
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24
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Lespessailles E, Jennane R. Assessment of bone mineral density and radiographic texture analysis at the tibial subchondral bone. Osteoporos Int 2012. [PMID: 23179572 DOI: 10.1007/s00198-012-2167-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Microstructural changes of subchondral bone constitute one of the figures characterising osteoarthritis on a structural level. Subchondral bone mineral density may reflect the complex relationship between bone and cartilage submitted to movement and loading. In this review, the authors discussed the interest of tibial subchondral bone mineral density assessment in the perspective of its diagnostic, etiopathogenic and prognostic value in osteoarthritis. In addition, the sources of variability linked to the measurement of tibial subchondral bone mineral density are precised. Trabecular bone structure characterisation by radiographic texture analyses may also represent a new promising tool to evaluate the microarchitectural changes that occur with initiation and progression of osteoarthritis. In this paper, the authors also highlighted the interest of different radiographic texture analyses and their clinical relevance in the field of osteoarthritis.
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Affiliation(s)
- E Lespessailles
- IPROS - EA 4708 I3MTO, University of Orleans, Orléans, France.
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25
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Goldring SR. Alterations in periarticular bone and cross talk between subchondral bone and articular cartilage in osteoarthritis. Ther Adv Musculoskelet Dis 2012; 4:249-58. [PMID: 22859924 DOI: 10.1177/1759720x12437353] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The articular cartilage and the subchondral bone form a biocomposite that is uniquely adapted to the transfer of loads across the diarthrodial joint. During the evolution of the osteoarthritic process biomechanical and biological processes result in alterations in the composition, structure and functional properties of these tissues. Given the intimate contact between the cartilage and bone, alterations of either tissue will modulate the properties and function of the other joint component. The changes in periarticular bone tend to occur very early in the development of OA. Although chondrocytes also have the capacity to modulate their functional state in response to loading, the capacity of these cells to repair and modify their surrounding extracellular matrix is relatively limited in comparison to the adjacent subchondral bone. This differential adaptive capacity likely underlies the more rapid appearance of detectable skeletal changes in OA in comparison to the articular cartilage. The OA changes in periarticular bone include increases in subchondral cortical bone thickness, gradual decreases in subchondral trabeular bone mass, formation of marginal joint osteophytes, development of bone cysts and advancement of the zone of calcified cartilage between the articular cartilage and subchondral bone. The expansion of the zone of calcified cartilage contributes to overall thinning of the articular cartilage. The mechanisms involved in this process include the release of soluble mediators from chondrocytes in the deep zones of the articular cartilage and/or the influences of microcracks that have initiated focal remodeling in the calcified cartilage and subchondral bone in an attempt to repair the microdamage. There is the need for further studies to define the pathophysiological mechanisms involved in the interaction between subchondral bone and articular cartilage and for applying this information to the development of therapeutic interventions to improve the outcomes in patients with OA.
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Affiliation(s)
- Steven R Goldring
- The Hospital for Special Surgery, 535 East 70th Street, New York, USA
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26
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Woloszynski T, Podsiadlo P, Stachowiak GW, Kurzynski M, Lohmander LS, Englund M. Prediction of progression of radiographic knee osteoarthritis using tibial trabecular bone texture. ACTA ACUST UNITED AC 2012; 64:688-95. [PMID: 21989629 DOI: 10.1002/art.33410] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE To develop a system for predicting the progression of radiographic knee osteoarthritis (OA) using tibial trabecular bone texture. METHODS We studied 203 knees with (n = 68) or without (n = 135) radiographic tibiofemoral OA in 105 subjects (90 men and 15 women with a mean age of 54 years) in whom 2 sets of knee radiographs were obtained 4 years apart. We determined medial and lateral compartment tibial trabecular bone texture using an automated region selection method. Three texture parameters were calculated: roughness, degree of anisotropy, and direction of anisotropy based on a signature dissimilarity measure method. We evaluated tibiofemoral OA progression using a radiographic semiquantitative outcome: an increase in the medial joint space narrowing (JSN) grade. We examined the predictive ability of trabecular bone texture in knees with and those without preexisting radiographic OA, with adjustment for age, sex, and body mass index, using logistic regression (generalized estimating equations) and receiver operating characteristic curves. RESULTS The prediction of increased medial JSN in knees with or without preexisting radiographic OA was the most accurate for medial trabecular bone texture; the area under the curve (AUC) was 0.77 and 0.75, respectively. For lateral trabecular bone texture, the AUC was 0.71 in knees with preexisting OA and 0.72 in knees without preexisting OA. CONCLUSION We have developed a system, based on analyzing tibial trabecular bone texture, which yields good prediction of loss of tibiofemoral joint space. The predictive ability of the system needs to be further validated.
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Affiliation(s)
- T Woloszynski
- School of Mechanical and Chemical Engineering, University of Western Australia, Crawley, Perth, Western Australia, Australia.
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Madry H, Luyten FP, Facchini A. Biological aspects of early osteoarthritis. Knee Surg Sports Traumatol Arthrosc 2012; 20:407-22. [PMID: 22009557 DOI: 10.1007/s00167-011-1705-8] [Citation(s) in RCA: 149] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Accepted: 10/04/2011] [Indexed: 01/15/2023]
Abstract
PURPOSE Early OA primarily affects articular cartilage and involves the entire joint, including the subchondral bone, synovial membrane, menisci and periarticular structures. The aim of this review is to highlight the molecular basis and histopathological features of early OA. METHODS Selective review of literature. RESULTS Risk factors for developing early OA include, but are not limited to, a genetic predisposition, mechanical factors such as axial malalignment, and aging. In early OA, the articular cartilage surface is progressively becoming discontinuous, showing fibrillation and vertical fissures that extend not deeper than into the mid-zone of the articular cartilage, reflective of OARSI grades 1.0-3.0. Early changes in the subchondral bone comprise a progressive increase in subchondral plate and subarticular spongiosa thickness. Early OA affects not only the articular cartilage and the subchondral bone but also other structures of the joint, such as the menisci, the synovial membrane, the joint capsule, ligaments, muscles and the infrapatellar fat pad. Genetic markers or marker combinations may become useful in the future to identify early OA and patients at risk. CONCLUSION The high socioeconomic impact of OA suggests that a better insight into the mechanisms of early OA may be a key to develop more targeted reconstructive therapies at this first stage of the disease. LEVEL OF EVIDENCE Systematic review, Level II.
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Affiliation(s)
- Henning Madry
- Experimental Orthopaedics and Osteoarthritis Research, Saarland University, Kirrbergerstrasse, Building 37, 66421, Homburg, Germany.
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Wolski M, Stachowiak GW, Dempsey AR, Mills PM, Cicuttini FM, Wang Y, Stoffel KK, Lloyd DG, Podsiadlo P. Trabecular bone texture detected by plain radiography and variance orientation transform method is different between knees with and without cartilage defects. J Orthop Res 2011; 29:1161-7. [PMID: 21381097 DOI: 10.1002/jor.21396] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Accepted: 02/07/2011] [Indexed: 02/04/2023]
Abstract
The objective of this work is to evaluate differences in trabecular bone (TB) texture between subjects with and without tibiofemoral cartilage defects using a variance orientation transform (VOT) method. A case-control study was performed in subjects without radiographic knee osteoarthritis (OA) (K&L grade <2) matched on sex, BMI, age, knee compartment, and meniscectomy where cases (n = 28) had cartilage defects (grade ≥2) and controls (n = 28) had no cartilage defects (grade <2). Cartilage defects were assessed from MRI using validated methods. The VOT was applied to TB regions selected on medial and lateral compartments in knee X-rays and fractal signatures (FS) in the horizontal (FS(H) ) and vertical (FS(V) ) directions, and along the roughest part of TB (FS(Sta) ) and texture aspect ratio signatures (StrS), at different trabecular image sizes (0.30-0.70 mm) were calculated. Compared with controls, FS(V) for cases were higher (p < 0.011) at image sizes 0.30-0.40 mm and 0.45-0.55 mm in the medial compartment. In the lateral compartment, FS(H) and FS(Sta) for cases were higher (p < 0.028) than those for controls at 0.30-0.40 mm and 0.45-0.55 mm, while FS(V) was higher (p < 0.02) at 0.30-0.40 mm. TB texture roughness was greater in subjects with cartilage defects than in subjects without, suggesting thinning and fenestration of TB occur early in OA and that the VOT identifies changes in TB in knees with early cartilage damage. No differences in StrS (p > 0.05) were found.
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Affiliation(s)
- Marcin Wolski
- Tribology Laboratory, School of Mechanical and Chemical Engineering, University of Western Australia, Crawley, WA 6009, Australia.
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29
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Schneider E, Lo GH, Sloane G, Fanella L, Hunter DJ, Eaton CB, McAlindon TE. Magnetic resonance imaging evaluation of weight-bearing subchondral trabecular bone in the knee. Skeletal Radiol 2011; 40:95-103. [PMID: 20449585 PMCID: PMC3886640 DOI: 10.1007/s00256-010-0943-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2010] [Revised: 04/13/2010] [Accepted: 04/14/2010] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Changes in weight-bearing subchondral bone are central to osteoarthritis (OA) pathophysiology. Using MR, knee trabecular bone is typically assessed in the axial plane, however partial volume artifacts limit the utility of MR methods for femorotibial compartment subchondral bone analysis. Oblique-coronal acquisitions may enable direct visualization and quantification of the expected increases in femorotibial subchondral trabecular bone. METHODS MR acquisition parameters were first optimized at 3 Tesla. Thereafter, five volunteers underwent axial and coronal exams of their right knee. Each image series was evaluated visually and quantitatively. An anatomically standardized region-of-interest was placed on both the medial and lateral tibial plateaus of all coronal slices containing subchondral bone. Mean and maximum marrow signal was measured, and "bone signal" was calculated. RESULTS The MR acquisition had spatial resolution 0.2 × 0.2 × 1.0 mm and acquisition time 10.5 min. The two asymptomatic knees exhibited prominent horizontal trabeculae in the tibial subchondral bone, while the one confirmed OA knee had disorganized subchondral bone and absent horizontal trabeculae. The subchondral bone signal was 8-14% higher in both compartments of the OA knee than the asymptomatic knees. CONCLUSION The weight-bearing femorotibial subchondral trabecular bone can be directly visualized and changes quantified in the coronal-oblique plane. Qualitative and quantitative assessments can be performed using the resultant images and may provide a method to discriminate between the healthy and OA knees. These methods should enable a quantitative evaluation of the role of weight-bearing subchondral bone in the natural history of knee OA to be undertaken.
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Affiliation(s)
- Erika Schneider
- Imaging Institute, HB6, The Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, USA. SciTrials LLC, Rocky River, OH, USA
| | - Grace H. Lo
- Department of Rheumatology, Tufts Medical Center, Boston, MA, USA
| | - Gretchen Sloane
- Memorial Hospital of Rhode Island and the Warren Alpert Medical School, Brown University School, Providence, RI, USA
| | - Lynn Fanella
- Memorial Hospital of Rhode Island and the Warren Alpert Medical School, Brown University School, Providence, RI, USA
| | - David J. Hunter
- New England Baptist Hospital, Boston, MA, USA. Northern Clinical School, University of Sydney, Sydney, Australia
| | - Charles B. Eaton
- Memorial Hospital of Rhode Island and the Warren Alpert Medical School, Brown University School, Providence, RI, USA
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Johnston JD, Kontulainen SA, Masri BA, Wilson DR. A comparison of conventional maximum intensity projection with a new depth-specific topographic mapping technique in the CT analysis of proximal tibial subchondral bone density. Skeletal Radiol 2010; 39:867-76. [PMID: 20635177 DOI: 10.1007/s00256-009-0835-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2009] [Revised: 10/14/2009] [Accepted: 11/02/2009] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The objective was to identify subchondral bone density differences between normal and osteoarthritic (OA) proximal tibiae using computed tomography osteoabsorptiometry (CT-OAM) and computed tomography topographic mapping of subchondral density (CT-TOMASD). MATERIALS AND METHODS Sixteen intact cadaver knees from ten donors (8 male:2 female; mean age:77.8, SD:7.4 years) were categorized as normal (n = 10) or OA (n = 6) based upon CT reconstructions. CT-OAM assessed maximum subchondral bone mineral density (BMD). CT-TOMASD assessed average subchondral BMD across three layers (0-2.5, 2.5-5 and 5-10 mm) measured in relation to depth from the subchondral surface. Regional analyses of CT-OAM and CT-TOMASD included: medial BMD, lateral BMD, and average BMD of a 10-mm diameter area that searched each medial and lateral plateau for the highest "focal" density present within each knee. RESULTS Compared with normal knees, both CT-OAM and CT-TOMASD demonstrated an average of 17% greater whole medial compartment density in OA knees (p < 0.016). CT-OAM did not distinguish focal density differences between OA and normal knees (p > 0.05). CT-TOMASD focal region analyses revealed an average of 24% greater density in the 0- to 2.5-mm layer (p = 0.003) and 36% greater density in the 2.5- to 5-mm layer (p = 0.034) in OA knees. CONCLUSIONS Both CT-OAM and TOMASD identified higher medial compartment density in OA tibiae compared with normal tibiae. In addition, CT-TOMASD indicated greater focal density differences between normal and OA knees with increased depth from the subchondral surface. Depth-specific density analyses may help identify and quantify small changes in subchondral BMD associated with OA disease onset and progression.
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Affiliation(s)
- James D Johnston
- Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, Canada.
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31
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Bellido M, Lugo L, Roman-Blas JA, Castañeda S, Caeiro JR, Dapia S, Calvo E, Largo R, Herrero-Beaumont G. Subchondral bone microstructural damage by increased remodelling aggravates experimental osteoarthritis preceded by osteoporosis. Arthritis Res Ther 2010; 12:R152. [PMID: 20678201 PMCID: PMC2945051 DOI: 10.1186/ar3103] [Citation(s) in RCA: 156] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2010] [Revised: 06/09/2010] [Accepted: 08/02/2010] [Indexed: 11/13/2022] Open
Abstract
Introduction Osteoporosis (OP) increases cartilage damage in a combined rabbit model of OP and osteoarthritis (OA). Accordingly, we assessed whether microstructure impairment at subchondral bone aggravates cartilage damage in this experimental model. Methods OP was induced in 20 female rabbits, by ovariectomy and intramuscular injections of methylprednisolone hemisuccinate for four weeks. Ten healthy animals were used as controls. At week 7, OA was surgically induced in left knees of all rabbits. At 22 weeks, after sacrifice, microstructure parameters were assessed by micro-computed tomography, and osteoprotegerin (OPG), receptor activator of nuclear factor-κB ligand (RANKL), alkaline phosphatase (ALP) and metalloproteinase 9 (MMP9) protein expressions were evaluated by Western Blot at subchondral bone. In addition, cartilage damage was estimated using the histopathological Mankin score. Mann-Whitney and Spearman statistical tests were performed as appropriate, using SPSS software v 11.0. Significant difference was established at P < 0.05. Results Subchondral bone area/tissue area, trabecular thickness and polar moment of inertia were diminished in OPOA knees compared with control or OA knees (P < 0.05). A decrease of plate thickness, ALP expression and OPG/RANKL ratio as well as an increased fractal dimension and MMP9 expression occurred at subchondral bone of OA, OP and OPOA knees vs. controls (P < 0.05). In addition, the severity of cartilage damage was increased in OPOA knees vs. controls (P < 0.05). Remarkably, good correlations were observed between structural and remodelling parameters at subchondral bone, and furthermore, between subchondral structural parameters and cartilage Mankin score. Conclusions Microstructure impairment at subchondral bone associated with an increased remodelling aggravated cartilage damage in OA rabbits with previous OP. Our results suggest that an increased subchondral bone resorption may account for the exacerbation of cartilage damage when early OA and OP coexist simultaneously in same individuals.
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Affiliation(s)
- Miriam Bellido
- Service of Rheumatology, Fundación Jiménez Díaz, Universidad Autónoma, Avda, Reyes Católicos, 2, 28040 Madrid, Spain.
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Progression analysis and stage discovery in continuous physiological processes using image computing. EURASIP JOURNAL ON BIOINFORMATICS & SYSTEMS BIOLOGY 2010; 2010:107036. [PMID: 20672025 DOI: 10.1155/2010/107036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2009] [Accepted: 04/21/2010] [Indexed: 11/18/2022]
Abstract
We propose an image computing-based method for quantitative analysis of continuous physiological processes that can be sensed by medical imaging and demonstrate its application to the analysis of morphological alterations of the bone structure, which correlate with the progression of osteoarthritis (OA). The purpose of the analysis is to quantitatively estimate OA progression in a fashion that can assist in understanding the pathophysiology of the disease. Ultimately, the texture analysis will be able to provide an alternative OA scoring method, which can potentially reflect the progression of the disease in a more direct fashion compared to the existing clinically utilized classification schemes based on radiology. This method can be useful not just for studying the nature of OA, but also for developing and testing the effect of drugs and treatments. While in this paper we demonstrate the application of the method to osteoarthritis, its generality makes it suitable for the analysis of other progressive clinical conditions that can be diagnosed and prognosed by using medical imaging.
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Wolski M, Podsiadlo P, Stachowiak GW, Lohmander LS, Englund M. Differences in trabecular bone texture between knees with and without radiographic osteoarthritis detected by directional fractal signature method. Osteoarthritis Cartilage 2010; 18:684-90. [PMID: 20175970 DOI: 10.1016/j.joca.2010.01.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Revised: 01/14/2010] [Accepted: 01/22/2010] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To evaluate differences in tibial trabecular bone (TB) texture between subjects with and without radiographic knee osteoarthritis (OA) using a variance orientation transform (VOT) method. DESIGN Subjects with knee OA (Kellgren & Lawrence grade > or =2) and controls without OA (both n=26, seven women) were matched by sex, age, body mass index and compartment. The VOT method was applied to TB X-ray images and fractal signature and dimension in horizontal (FS(H), FD(H)) and vertical (FS(V), FD(V)) directions and along the roughest part of TB (FS(Sta), FD(Sta)), texture aspect ratio (Str) and signature (StrS), and mean FD (FD(MEAN)) were calculated. The VOT method was compared against an augmented Hurst orientation transform (HOT) method using paired t tests, intraclass correlation coefficients (ICCs) and coefficients of variation (CVs%). Longitudinal sensitivity to OA bone changes was not assessed. RESULTS For the reproducibility of texture parameters, ICCs were >0.75 and CVs% were <8.2% for both methods. Compared with controls, FD(MEAN), FD(H), FD(V) and FD(Sta) for OA knees were lower (P<0.001), while Str was higher in both medial (P=0.03) and lateral (P=0.02) compartments. FS(H), FS(Sta) were lower for OA knees than for controls at sizes 0.3-0.7 mm (P<0.001) in both compartments. In lateral compartment, FS(V) for OA knees was lower than for controls at sizes 0.3-0.5 mm (P<0.001) and 0.55-0.70 mm (P<0.02), while in medial compartment at sizes 0.3-0.7 mm (P<0.001). Compared with controls, StrS for OA knees was higher at sizes 0.3, 0.55-0.70 mm in medial (P<0.03) and lateral (P<0.04) compartments. CONCLUSIONS The VOT method is comparable to HOT method in the reproducibility of texture parameters and the ability to discriminate between non-OA and OA TB textures. However, unlike the HOT method, it quantifies texture roughness along the roughest part of the tibial bone, texture anisotropy at individual trabecular sizes and it works over a larger range of trabecular sizes. The VOT method may be a valuable tool for studying OA changes in TB.
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Affiliation(s)
- M Wolski
- Tribology Laboratory, School of Mechanical Engineering, University of Western Australia, Crawley, Western Australia, Australia.
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Bennell KL, Creaby MW, Wrigley TV, Hunter DJ. Tibial subchondral trabecular volumetric bone density in medial knee joint osteoarthritis using peripheral quantitative computed tomography technology. ACTA ACUST UNITED AC 2010; 58:2776-85. [PMID: 18759296 DOI: 10.1002/art.23795] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Knee osteoarthritis (OA) is an organ-level failure of the joint involving pathologic changes in articular cartilage and bone. This cross-sectional study compared apparent volumetric bone mineral density (vBMD) of proximal tibial subchondral trabecular bone in people with and without knee OA, using peripheral quantitative computed tomography (pQCT). METHODS Seventy-five individuals with mild or moderate medial compartment knee OA and 41 asymptomatic controls were recruited. Peripheral QCT was used to measure vBMD of trabecular bone beneath medial and lateral tibiofemoral compartments at levels of 2% and 4% of tibial length, distal to the tibial plateau. RESULTS There was no significant difference in vBMD beneath the overall medial and lateral compartments between the 3 groups. However, in the affected medial compartment of those with moderate OA, lower vBMD was seen in the 2 posterior subregions compared with controls and those with mild knee OA, while higher vBMD was seen in the anteromedial subregion. Beneath the unaffected or lesser affected lateral compartment, significantly lower vBMD was seen at the 2% level in the anterior and lateral subregions of those with moderate disease. Volumetric BMD ratios showed relatively higher vBMD in the medial compartment compared with the lateral compartment, but these ratios were not influenced by disease status. CONCLUSION Subregional vBMD changes were evident beneath the medial and lateral compartments of those with moderate medial knee OA. Of import, the posterior subchondral trabecular regions of the medial tibial plateau have markedly lower vBMD.
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Affiliation(s)
- Kim L Bennell
- The University of Melbourne, Melbourne, Victoria, Australia.
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35
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Kraus VB, Feng S, Wang S, White S, Ainslie M, Brett A, Holmes A, Charles HC. Trabecular morphometry by fractal signature analysis is a novel marker of osteoarthritis progression. ACTA ACUST UNITED AC 2010; 60:3711-22. [PMID: 19950282 DOI: 10.1002/art.25012] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVE To evaluate the effectiveness of using subchondral bone texture observed on a radiograph taken at baseline to predict progression of knee osteoarthritis (OA) over a 3-year period. METHODS A total of 138 participants in the Prediction of Osteoarthritis Progression study were evaluated at baseline and after 3 years. Fractal signature analysis (FSA) of the medial subchondral tibial plateau was performed on fixed flexion radiographs of 248 nonreplaced knees, using a commercially available software tool. OA progression was defined as a change in joint space narrowing (JSN) or osteophyte formation of 1 grade according to a standardized knee atlas. Statistical analysis of fractal signatures was performed using a new model based on correlating the overall shape of a fractal dimension curve with radius. RESULTS Fractal signature of the medial tibial plateau at baseline was predictive of medial knee JSN progression (area under the curve [AUC] 0.75, of a receiver operating characteristic curve) but was not predictive of osteophyte formation or progression of JSN in the lateral compartment. Traditional covariates (age, sex, body mass index, knee pain), general bone mineral content, and joint space width at baseline were no more effective than random variables for predicting OA progression (AUC 0.52-0.58). The predictive model with maximum effectiveness combined fractal signature at baseline, knee alignment, traditional covariates, and bone mineral content (AUC 0.79). CONCLUSION We identified a prognostic marker of OA that is readily extracted from a plain radiograph using FSA. Although the method needs to be validated in a second cohort, our results indicate that the global shape approach to analyzing these data is a potentially efficient means of identifying individuals at risk of knee OA progression.
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Johnston JD, Masri BA, Wilson DR. Computed tomography topographic mapping of subchondral density (CT-TOMASD) in osteoarthritic and normal knees: methodological development and preliminary findings. Osteoarthritis Cartilage 2009; 17:1319-26. [PMID: 19427927 DOI: 10.1016/j.joca.2009.04.013] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2008] [Revised: 04/01/2009] [Accepted: 04/12/2009] [Indexed: 02/02/2023]
Abstract
OBJECTIVES To develop a precise imaging tool which measures three-dimensional (3D) subchondral bone mineral density (BMD), and investigate its ability to distinguish subchondral bone properties in osteoarthritic and normal cadaveric tibiae. METHODS We developed a novel imaging tool [Computed tomography topographic mapping of subchondral density (CT-TOMASD)], which employs a surface projection image processing technique to map 3D subchondral BMD measured in relation to depth from the joint surface. Sixteen intact cadaver knees from 10 donors (8M:2F; age: 77.8+/-7.4) were scanned using quantitative computed tomography (QCT). Projections of average BMD to normalized depths of 2.5mm and 5.0mm were acquired, with regional analyses including: (1) medial and lateral BMD, (2) anterior/central/posterior compartmental BMD, (3) max BMD contained within a 10mm diameter 'core', and (4) medial:lateral BMD ratio. Precision was assessed using coefficients of variation (CV%). Osteoarthritis (OA) severity was assessed by examination of computed tomography (CT) and fluoroscopic radiographic images, and categorized using modified Kellgren-Lawrence (mKL) scoring. RESULTS Precision errors for CT-TOMASD BMD measures were focused around 1.5%, reaching a maximum CV% of 3.5%. OA was identified in eight compartments of six knees. Substantial qualitative and quantitative differences were observed between the OA and normal knees, with the medial:lateral BMD ratio and peak core regional analyses demonstrating differences greater than 4.7 standard deviations (SDs) when compared with normals. Preliminary results revealed effect sizes ranging from 1.6 to 4.3 between OA and normal knees. CONCLUSIONS CT-TOMASD offers precise 3D measures of subchondral BMD. Preliminary results demonstrate large qualitative and quantitative differences and large effect sizes between OA and normal knees. This method has the potential to identify and quantify changes in subchondral BMD associated with OA disease progression.
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Affiliation(s)
- J D Johnston
- Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 1G9, Canada.
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Shamir L, Ling SM, Scott W, Hochberg M, Ferrucci L, Goldberg IG. Early detection of radiographic knee osteoarthritis using computer-aided analysis. Osteoarthritis Cartilage 2009; 17:1307-12. [PMID: 19426848 PMCID: PMC2753739 DOI: 10.1016/j.joca.2009.04.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Revised: 03/26/2009] [Accepted: 04/12/2009] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To determine whether computer-based analysis can detect features predictive of osteoarthritis (OA) development in radiographically normal knees. METHOD A systematic computer-aided image analysis method weighted neighbor distances using a compound hierarchy of algorithms representing morphology (WND-CHARM) was used to analyze pairs of weight-bearing knee X-rays. Initial X-rays were all scored as normal Kellgren-Lawrence (KL) grade 0, and on follow-up approximately 20 years later either developed OA (defined as KL grade=2) or remained normal. RESULTS The computer-aided method predicted whether a knee would change from KL grade 0 to grade 3 with 72% accuracy (P<0.00001), and to grade 2 with 62% accuracy (P<0.01). Although a large part of the predictive signal comes from the image tiles that contained the joint, the region adjacent to the tibial spines provided the strongest predictive signal. CONCLUSION Radiographic features detectable using a computer-aided image analysis method can predict the future development of radiographic knee OA.
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Affiliation(s)
- Lior Shamir
- Image Informatics and Computational Biology Unit, Laboratory of Genetics, NIA, NIH, 251 Bayview Boulevard, Baltimore, MD 21224, USA,Corresponding author: Tel: (410) 558-8682 Fax: (410) 558-8331, (Lior Shamir)
| | - Shari M. Ling
- Clinical Research Branch, NIA, NIH, 3001 Hanover Street, MD 21225, USA
| | - William Scott
- Department of Radiology, Johns Hopkins School of Medicine, 600 North Wolfe Street, Baltimore, MD 21287, USA
| | - Marc Hochberg
- Department of Medicine, University of Maryland Medical Center, 22 S. Greene Street, Baltimore, MD 21201, USA
| | - Luigi Ferrucci
- Clinical Research Branch, NIA, NIH, 3001 Hanover Street, MD 21225, USA
| | - Ilya G. Goldberg
- Image Informatics and Computational Biology Unit, Laboratory of Genetics, NIA, NIH, 251 Bayview Boulevard, Baltimore, MD 21224, USA
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Rossini M, Viapiana O, Ramonda R, Bianchi G, Olivieri I, Lapadula G, Adami S. Intra-articular clodronate for the treatment of knee osteoarthritis: dose ranging study vs hyaluronic acid. Rheumatology (Oxford) 2009; 48:773-8. [PMID: 19406908 DOI: 10.1093/rheumatology/kep084] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVE Bisphosphonates may have a chondroprotective effect in patients with knee OA (KOA), but the results of clinical trials with oral bisphosphonates have been contradictory. In this Phase 2 randomized, partially blind clinical trial, we tested the efficacy of IA clodronate vs HA in patients with primary KOA. METHODS One hundred and fifty men or women aged 50-75 years suffering from KOA were randomized to one of five IA therapies: (i) clodronate 0.5 mg one IA injection/week for 4 weeks; (ii) clodronate 1 mg one IA injection/week for 4 weeks; (iii) clodronate 2 mg one IA injection/week for 4 weeks; (iv) clodronate 1 mg two IA injections/week for 2 weeks (clodronate 1 + 1 mg); and (v) HA 20 mg one IA injection/week for 4 weeks. RESULTS Visual analogue scores (VASs) for different types of pain and the Lequesne index significantly improved in all treatment groups after the first injection and continued to improve even 2-4 weeks after the last injection without significant difference among the groups. A significant (P = 0.03) linear trend for a dose-response (0.5-2 mg clodronate) relationship was found for active movement VAS pain. Both joint extension and mobility scores improved significantly at all time points in all treatment groups without statistical differences among them. CONCLUSIONS This study indicates that IA clodronate provides symptomatic and functional improvements at least as good as those obtained with HA. Trial Registration. Osservatorio Nazionale sulla Sperimentazione Clinica dei Medicinali - Agenzia Italiana del Farmaco. Comitato Etico Azienda Ospedaliera Universitaria Senese number CLIO 22/02 http://oss-sper-clin.agenziafarmaco.it.
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Abstract
Much of the attention in developing diagnostic tools and therapeutic interventions for the management of osteoarthritis (OA) has focused on the preservation or repair of articular cartilage. It is clear that all of the joint components, including the ligaments, tendons, capsule, synovial lining, and periarticular bone, undergo structural and functional alterations during the course of OA progression. This article focuses on the specific skeletal features of OA and the putative mechanisms involved in their pathogenesis.
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Affiliation(s)
- Steven R Goldring
- The Hospital for Special Surgery, Weill College of Medicine of Cornell University, 535 East 70th Street, New York, NY 10021, USA.
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Shamir L, Ling S, Rahimi S, Ferrucci L, Goldberg IG. Biometric identification using knee X-rays. INTERNATIONAL JOURNAL OF BIOMETRICS 2009; 1:365-370. [PMID: 20046910 DOI: 10.1504/ijbm.2009.024279] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Identification of people often makes use of unique features of the face, fingerprints and retina. Beyond this, a similar identifying process can be applied to internal parts of the body that are not visible to the unaided eye. Here we show that knee X-rays can be used for the identification of individual persons. The image analysis method is based on the wnd-charm algorithm, which has been found effective for the diagnosis of clinical conditions of knee joints. Experimental results show that the rank-10 identification accuracy using a dataset of 425 individuals is ~56%, and the rank-1 accuracy is ~34%. The dataset contained knee X-rays taken several years apart from each other, showing that the identifiable features correspond to specific persons, rather than the present clinical condition of the joint.
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Affiliation(s)
- Lior Shamir
- Laboratory of Genetics, National Institute on Aging, National Institutes of Health 251, Bayview boulevard, Baltimore, MD 21224, Tel: 410-558-8682 ,
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Podsiadlo P, Wolski M, Stachowiak GW. Automated selection of trabecular bone regions in knee radiographs. Med Phys 2008; 35:1870-83. [PMID: 18561662 DOI: 10.1118/1.2905025] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Osteoarthritic (OA) changes in knee joints can be assessed by analyzing the structure of trabecular bone (TB) in the tibia. This analysis is performed on TB regions selected manually by a human operator on x-ray images. Manual selection is time-consuming, tedious, and expensive. Even if a radiologist expert or highly trained person is available to select regions, high inter- and intraobserver variabilities are still possible. A fully automated image segmentation method was, therefore, developed to select the bone regions for numerical analyses of changes in bone structures. The newly developed method consists of image preprocessing, delineation of cortical bone plates (active shape model), and location of regions of interest (ROI). The method was trained on an independent set of 40 x-ray images. Automatically selected regions were compared to the "gold standard" that contains ROIs selected manually by a radiologist expert on 132 x-ray images. All images were acquired from subjects locked in a standardized standing position using a radiography rig. The size of each ROI is 12.8 x 12.8 mm. The automated method results showed a good agreement with the gold standard [similarity index (SI) = 0.83 (medial) and 0.81 (lateral) and the offset =[-1.78, 1.27]x[-0.65,0.26] mm (medial) and [-2.15, 1.59]x[-0.58, 0.52] mm (lateral)]. Bland and Altman plots were constructed for fractal signatures, and changes of fractal dimensions (FD) to region offsets calculated between the gold standard and automatically selected regions were calculated. The plots showed a random scatter and the 95% confidence intervals were (-0.006, 0.008) and (-0.001, 0.011). The changes of FDs to region offsets were less than 0.035. Previous studies showed that differences in FDs between non-OA and OA bone regions were greater than 0.05. ROIs were also selected by a second radiologist and then evaluated. Results indicated that the newly developed method could replace a human operator and produces bone regions with an accuracy that is sufficient for fractal analyses of bone texture.
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Affiliation(s)
- P Podsiadlo
- Tribology Laboratory, School of Mechanical Engineering, The University of Western Australia, Crawley 6009, Western Australia.
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Podsiadlo P, Dahl L, Englund M, Lohmander LS, Stachowiak GW. Differences in trabecular bone texture between knees with and without radiographic osteoarthritis detected by fractal methods. Osteoarthritis Cartilage 2008; 16:323-9. [PMID: 17825585 DOI: 10.1016/j.joca.2007.07.010] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Accepted: 07/16/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To develop an accurate method for quantifying differences in the trabecular structure in the tibial bone between subjects with and without knee osteoarthritis (OA). METHODS Standard knee radiographs were taken from 26 subjects (seven women) with meniscectomy and radiographic OA Kellgren & Lawrence grade 2 or worse in the medial compartment. Each case knee was individually matched by sex, age, body mass index and medial or lateral compartment with a control knee. A newly developed augmented Hurst orientation transform (HOT) method was used to calculate texture parameters for regions selected in X-ray images of non-OA and OA tibial bones. This method produces a mean value of fractal dimensions (FD MEAN), FDs in the vertical (FDV) and horizontal (FDH) directions and along a direction of the roughest part of the tibial bone (FDSta), fractal signatures and a texture aspect ratio (Str). The ratio determines a degree of the bone texture anisotropy. Reproducibility was calculated using an intraclass correlation coefficient (ICC). Comparisons between cases and controls were made with paired t tests. The performance of the HOT method was evaluated against a benchmark fractal signature analysis (FSA) method. RESULTS Compared with controls, trabecular bone in OA knees showed significantly lower FD MEAN, FDV, FDH and FDSta and higher Str at trabecular image sizes 0.2-1.1mm (P<0.05, HOT). The reproducibility of all parameters was very good (ICC>0.8). In the medial compartment, fractal signatures calculated for OA horizontal and vertical trabeculae were significantly lower at sizes 0.3-0.55 mm (P<0.05, HOT) and 0.3-0.65 mm (P<0.001, FSA). In the lateral compartment, FDs calculated for OA trabeculae were lower than controls (horizontal: 0.3-0.55 mm (P<0.05, HOT) and 0.3-0.65 mm (P<0.001, FSA); vertical: 0.3-0.4mm (P<0.05, HOT) and 0.3-0.35 mm (P<0.001, FSA). CONCLUSION The augmented HOT method produces fractal signatures that are comparable to those obtained from the benchmark FSA method. The HOT method provides a more detailed description of OA changes in bone anisotropy than the FSA method. This includes a degree of bone anisotropy measured using data from all possible directions and a texture roughness calculated for the roughest part of the bone. It appears that the augmented HOT method is well suited to quantify OA changes in the tibial bone structure.
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Affiliation(s)
- P Podsiadlo
- Tribology Laboratory, School of Mechanical Engineering, University of Western Australia.
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Gajre SS, Singh U, Saxena RK, Anand S. Electrical impedance signal analysis in assessing the possibility of non-invasive diagnosis of knee osteoarthritis. J Med Eng Technol 2007; 31:288-99. [PMID: 17566932 DOI: 10.1080/03091900600863745] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Knee osteoarthritis (OA) is a degenerating disorder that leads to pain, disability and dependence. Although significant numbers of elderly people are affected by this irreversible damage, not many non-invasive methods have been found that can detect onset of OA. The traditional x-ray has the disadvantage of detecting a problem only after many changes have taken place. Others, such as MRI and ultrasound, are either expensive or unsuitable for mass screening and repeated use. In this paper, an attempt has been made to study the usefulness of electrical impedance plethysmography (EIP) in non-invasive diagnosis of knee OA. In two experiments on 10 OA knees and eight control knees in groups aged 45 - 65 years (OA group: 62.40 +/- 3.47 years, controls: 53.38 +/- 8.55 years), knee swing (active flexion and extension of leg in sitting position, KS) and normal walking (WN) electrical impedance changes (DeltaZ) around the knee were analysed. The results indicate that there is significant difference in amplitudes of signals. Difference in mean of variances of two groups was significant (p < 0.05) for KS and WN. The difference in the mean rms values was also significant (p < 0.05) for KS and WN. Impedance changes suggest that EIP signal around the knee have the potential for non-invasive diagnosis of knee OA.
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Affiliation(s)
- S S Gajre
- Centre for Biomedical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, India.
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Messent EA, Ward RJ, Tonkin CJ, Buckland-Wright C. Osteophytes, juxta-articular radiolucencies and cancellous bone changes in the proximal tibia of patients with knee osteoarthritis. Osteoarthritis Cartilage 2007; 15:179-86. [PMID: 16905342 DOI: 10.1016/j.joca.2006.06.020] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2006] [Accepted: 06/30/2006] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To determine differences in tibial cancellous bone organisation in knee osteoarthritis (OA) between the central weight-bearing region and juxta-articular radiolucencies adjacent to small, medium or large marginal osteophytes. METHODS Patients with medial compartment OA (n = 60; F = 39), mean (SD) age 60.0 (9.7) years, and non-OA reference subjects (n = 21; F = 5), mean (SD) age 36.8 (11.5) years, had x4 macroradiographs digitised by laser scanner. Using a modified Osteoarthritis Research Society (OARS) Atlas, right and/or left knees were graded according to marginal osteophyte size into those with small (n = 30), medium (n = 30) or large (n = 27) marginal osteophytes, identified as OPH1, OPH2 and OPH3, respectively. Non-OA knees (n = 30) were anatomically normal. Computerised method of Fractal Signature Analysis (FSA) quantified differences in cancellous bone structure between non-OA and osteophyte subgroups at two regions of interest (ROIs); central weight-bearing and tibial margin. RESULTS Compared to non-OA, vertical trabecular number increased significantly (P < 0.05) in all osteophyte subgroups (width range 0.12-1.14 mm) within both ROIs. In OPH3, this increase was significantly (P < 0.05) greater compared to OPH2 in the central ROI, and to OPH2 and OPH1 in the marginal ROI at most trabecular widths (0.12-1.14 mm). In the marginal ROI, compared to non-OA, horizontal trabeculae number decreased in all osteophyte subgroups. This decrease was significantly greater in OPH3 compared to OPH2 and OPH1 at small to medium trabecular widths (0.12-0.54 mm). CONCLUSION Compared to disease associated bone loss at the central ROI of the tibia, the extent of juxta-articular bone loss appears to be associated with the size of the marginal osteophytes.
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Affiliation(s)
- E A Messent
- Department of Applied Clinical Anatomy, King's College London, School of Biomedical Sciences, Guy's Hospital Campus, London, UK
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Bingham CO, Buckland-Wright JC, Garnero P, Cohen SB, Dougados M, Adami S, Clauw DJ, Spector TD, Pelletier JP, Raynauld JP, Strand V, Simon LS, Meyer JM, Cline GA, Beary JF. Risedronate decreases biochemical markers of cartilage degradation but does not decrease symptoms or slow radiographic progression in patients with medial compartment osteoarthritis of the knee: results of the two-year multinational knee osteoarthritis structural arthritis study. ACTA ACUST UNITED AC 2006; 54:3494-507. [PMID: 17075851 DOI: 10.1002/art.22160] [Citation(s) in RCA: 271] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
OBJECTIVE Bisphosphonates have slowed the progression of osteoarthritis (OA) in animal models and have decreased pain in states of high bone turnover. The Knee OA Structural Arthritis (KOSTAR) study, which is the largest study to date investigating a potential structure-modifying OA drug, tested the efficacy of risedronate in providing symptom relief and slowing disease progression in patients with knee OA. METHODS The study group comprised 2,483 patients with medial compartment knee OA and 2-4 mm of joint space width (JSW), as determined using fluoroscopically positioned, semiflexed-view radiography. Patients were enrolled in 2 parallel 2-year studies in North America and the European Union. These studies evaluated the efficacy of risedronate at dosages of 5 mg/day, 15 mg/day, 35 mg/week (in Europe), and 50 mg/week (in North America) compared with placebo in reducing signs and symptoms, as measured by the Western Ontario and McMaster Universities Osteoarthritis (WOMAC) index and patient global assessment (PGA) scores, and in slowing radiographic progression. RESULTS A reduction of approximately 20% in signs and symptoms, as measured by WOMAC subscales and PGA scores, was observed in all groups, with no treatment effect of risedronate demonstrated. Risedronate did not significantly reduce radiographic progression as measured by decreased JSW or using a dichotomous definition of progression (joint space loss of >or=0.6 mm). Thirteen percent of patients receiving placebo demonstrated significant disease progression over 2 years. A dose-dependent reduction in the level of C-terminal crosslinking telopeptide of type II collagen, a cartilage degradation marker associated with progressive OA, was seen in patients who received risedronate. No increase in the number of adverse events was demonstrated for risedronate compared with placebo. CONCLUSION Although risedronate (compared with placebo) did not improve signs or symptoms of OA, nor did it alter progression of OA, a reduction in the level of a marker of cartilage degradation was observed. A sustained clinically relevant improvement in signs and symptoms was observed in all treatment and placebo groups.
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Affiliation(s)
- Clifton O Bingham
- Division of Rheumatology, Johns Hopkins University, 5200 Eastern Avenue, Mason F. Lord Building, Center Tower, Room 404, Baltimore, MD 21224, USA.
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Messent EA, Ward RJ, Tonkin CJ, Buckland-Wright C. Differences in trabecular structure between knees with and without osteoarthritis quantified by macro and standard radiography, respectively. Osteoarthritis Cartilage 2006; 14:1302-5. [PMID: 16990028 DOI: 10.1016/j.joca.2006.07.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2006] [Accepted: 07/23/2006] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To compare the sensitivity of standard and macro-radiography for quantifying cancellous bone differences between subjects with and without medial compartment knee osteoarthritis (OA). METHODS Patients with medial compartment knee OA (n=24) and non-OA reference subjects (n=10) had a standard and a macro-radiograph (x4 magnification) of one knee. Fractal Signature Analysis (FSA), a computerised image analysis technique, measured differences in cancellous bone structure between OA and non-OA tibiae in all radiographs. RESULTS Compared to non-OA, FSA of vertical trabeculae in macro-radiographs increased significantly (P<0.05) in the OA group at several trabecular widths (0.30-0.60mm, 0.7 mm, 0.98-1.14 mm) and in standard radiographs at a single trabecular width (0.48 mm). CONCLUSION Compared to standard radiography, increased spatial resolution of macro-radiography allowed greater detection of trabecular bone differences between OA and non-OA knees. Nonetheless, difference was also detected in standard radiographs.
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Affiliation(s)
- E A Messent
- Department of Applied Clinical Anatomy, King's College London, School of Medicine, Guy's Hospital Campus, London, UK
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Lo GH, Zhang Y, McLennan C, Niu J, Kiel DP, McLean RR, Aliabadi P, Felson DT, Hunter DJ. The ratio of medial to lateral tibial plateau bone mineral density and compartment-specific tibiofemoral osteoarthritis. Osteoarthritis Cartilage 2006; 14:984-90. [PMID: 16765066 DOI: 10.1016/j.joca.2006.04.010] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2006] [Accepted: 04/10/2006] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Bone is thought to play an important role in osteoarthritis (OA) pathophysiology. Our aim was to look at specific features of OA and their relation to the ratio of medial:lateral tibial plateau bone mineral density (M:L BMD Ratio). METHODS We examined our research question in the Framingham OA Study Cohort. All participants had BMDs and weight-bearing plain radiographs of the knees (2002-2005). M:L BMD Ratios were calculated using BMD from medial and lateral regions in the tibial plateau. Knee x-rays were read for osteophytes (OSTs), joint space narrowing (JSN), and sclerosis (Osteoarthritis Research Society International (OARSI) scoring system). Knees were classified as having medial and/or lateral JSN if they had JSN >or=1 in the medial and/or lateral tibiofemoral compartments, respectively. Medial and/or lateral OSTs were defined as medial and/or lateral tibial and/or femoral OSTs >or=2, respectively. Medial sclerosis and lateral sclerosis were defined as medial and lateral tibial sclerosis >or=1, respectively. We performed a logistic regression with medial JSN as the outcome and with M:L BMD Ratio groups as predictor variables, using the median group as the referent. Analyses were adjusted for age, sex, and body mass index (BMI). Generalized estimating equations were used to adjust for correlation between knees. Identical analyses were performed with medial OSTs, medial sclerosis, lateral JSN, lateral OSTs, and lateral sclerosis as the outcomes. RESULTS Mean age of 1612 subjects (3048 knees) was 63.9 (Standard Deviation (SD)+/-8.9), 56% were women, and mean BMI was 28.5 (SD+/-5.5). M:L BMD Ratio was positively associated with medial JSN (P for linear trend <0.0001) and negatively associated with lateral JSN (P for linear trend <0.0001). The relations of the ratio with medial and lateral OSTs were j-shaped with P for quadratic trends <0.0001. There were also strong associations between M:L BMD Ratio and compartment-specific sclerosis (P for linear trends <0.0001) with most knees with medial and lateral sclerosis being in the highest and lowest M:L BMD Ratio groups, respectively. CONCLUSION In summary, the extremes of the M:L BMD Ratio are strongly associated with individual radiographic features of OA. These findings add to existing evidence supporting the importance of understanding bone in OA pathophysiology.
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Affiliation(s)
- G H Lo
- Tufts - New England Medical Center, Boston, MA 0211, USA.
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Szebenyi B, Hollander AP, Dieppe P, Quilty B, Duddy J, Clarke S, Kirwan JR. Associations between pain, function, and radiographic features in osteoarthritis of the knee. ACTA ACUST UNITED AC 2006; 54:230-5. [PMID: 16385522 DOI: 10.1002/art.21534] [Citation(s) in RCA: 160] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE To assess the associations between pain, loss of function, and radiographic changes in knee osteoarthritis (OA), taking into account both the patellofemoral and tibiofemoral compartments. METHODS Both knees of 167 community-based patients with OA in at least 1 of their knees were assessed. Pain was measured by visual analog scale, and function was assessed using the Western Ontario and McMaster Universities Osteoarthritis Index. Anteroposterior standing radiographs with the knee in extension and lateral 30 degrees flexion were obtained and assessed for the Kellgren/Lawrence score and for individual features (osteophytes, joint space narrowing, and subchondral bone sclerosis) in each compartment. RESULTS Knees with structural changes in both compartments were more likely to be painful and to be associated with loss of function than were knees in which only 1 compartment was affected. The individual feature most strongly associated with pain was subchondral bone sclerosis. CONCLUSION Studies exploring the associations between structural and symptomatic knee OA need to include an assessment of the patellofemoral compartment, and individual radiographic features rather than a global severity score should be considered in these studies.
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Affiliation(s)
- Béla Szebenyi
- Academc Rheumatology, Department of Clinical Science at North Bristol, University of Bristol, Avon Orthopaedic Centre, Southmead Hospital, Bristol BS10 5NB, UK.
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Papaloucas CD, Ward RJ, Tonkin CJ, Buckland-Wright C. Cancellous bone changes in hip osteoarthritis: a short-term longitudinal study using fractal signature analysis. Osteoarthritis Cartilage 2005; 13:998-1003. [PMID: 16154774 DOI: 10.1016/j.joca.2005.06.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2004] [Accepted: 06/20/2005] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To quantify changes to the trabecular structure in the femoral heads of patients with hip osteoarthritis (OA). METHODS Patients with OA (n=14; F=7), mean (standard deviation age) 50.6 (10.1) years, had macroradiographs at approximately x4 magnification at baseline and 18 months later using a standardized protocol. Following digitization, computerized measurement was obtained of minimum hip joint space width and fractal signature analysis (FSA) measured longitudinal changes separately in the principal compressive (vertical) and horizontal trabeculae at the region of interest within the centre of the head. RESULTS The patient group had mean annual rate of joint space narrowing of 0.14+/-0.36 mm/yr. FSA detected no significant changes in horizontal trabeculae, whereas the larger principal compressive (vertical) trabeculae (0.96 mm to 1.02 mm) increased significantly in thickness and the fine to medium trabeculae (0.18 mm to 0.54 mm) decreased significantly in number. CONCLUSION The increased thickness of the larger trabeculae within the compressive structural element of the femoral head is a response to the increase in stress associated with an overall loss of trabeculae in this region, suggesting the presence of an osteoporosis within the femoral head in OA patients.
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Affiliation(s)
- C D Papaloucas
- Department of Applied Clinical Anatomy, King's College London, School of Biomedical Sciences, Guy's Hospital Campus, London, UK
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