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Mochizuki G, Bayley M, Chandra T, Comper P, Danells C, Foster E, Habib Perez O, Hameed H, Inness E, Khimji F, Sweeny M. The Toronto Concussion Study: Reference Data for Balance and Gait Measures in Community-Dwelling Adults With Concussion. Phys Ther 2022; 102:6585839. [PMID: 35588230 DOI: 10.1093/ptj/pzac060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 11/19/2021] [Accepted: 02/26/2022] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Concussion can cause deficits in balance and gait. Much of what is known about how concussion affects balance and gait has been derived from studies involving youth, high school, and university athletes. However, investigation into the effects of concussion on balance and gait in community-dwelling young, middle-age, and older aged adults is limited. This study aimed to present descriptive reference values for common balance and gait measures in community-dwelling adults between the ages of 20 and 69 years with concussion. METHODS In this observational study, 318 participants were enrolled from a concussion care clinic at a rehabilitation hospital in an urban center and were assessed within 7 days of injury. Balance measures included the Balance Error Scoring System (BESS), modified BESS, and center-of-pressure root mean square during quiet standing. Gait measures included velocity (absolute and height adjusted), cadence, and step length during self-paced gait. Data were binned by decade-long age range. RESULTS Mean (SD) per-decade scores for the BESS ranged from 14.8 (5.1) to 21.8 (5.6) errors and 4.0 (3.0) to 9.4 (4.6) errors for the modified BESS. Mean values for center-of-pressure root mean square in the anteroposterior direction ranged from 0.42 (0.18) to 0.52 (0.26) with the eyes open, and from 0.49 (0.19) to 0.62 (0.39) with eyes closed. Mean absolute gait velocity ranged from 98.5 (9.1) to 119.3 (21.3) cm/s. The range of step length values was 58.2 (6.8) to 66.3 (7.3) cm and cadence ranged from 102.1 (9.8) to 108.6 (10.8) steps/min across age groups. CONCLUSION These data provide insight into the impact of concussion on balance and mobility in community-dwelling adults across the lifespan. IMPACT Community-dwelling adults can experience concussion across the lifespan. Availability of reference values for commonly used balance and gait measures can help to inform clinical strategies and progression of recovery of balance and mobility after injury.
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Affiliation(s)
- George Mochizuki
- School of Kinesiology and Health Science, York University, Toronto, Canada
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
| | - Mark Bayley
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
- Division of Physical Medicine and Rehabilitation, Faculty of Medicine, University of Toronto, Toronto, Canada
| | - Tharshini Chandra
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
| | - Paul Comper
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
- Rehabilitation Sciences Institute, University of Toronto, Toronto, Canada
- Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, Canada
| | - Cynthia Danells
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
- Department of Physical Therapy, University of Toronto, Toronto, Canada
| | - Evan Foster
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
- Translational Research Program, University of Toronto, Toronto, Canada
| | - Olinda Habib Perez
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
| | - Hajr Hameed
- School of Kinesiology and Health Science, York University, Toronto, Canada
| | - Elizabeth Inness
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
- Rehabilitation Sciences Institute, University of Toronto, Toronto, Canada
- Department of Physical Therapy, University of Toronto, Toronto, Canada
| | - Fatema Khimji
- School of Kinesiology and Health Science, York University, Toronto, Canada
| | - Michelle Sweeny
- Toronto Rehabilitation Institute - University Health Network, Toronto, Canada
- Rehabilitation Sciences Institute, University of Toronto, Toronto, Canada
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Yan H, Guo J, Zhou W, Dong C, Liu J. Health-related quality of life in osteoarthritis patients: a systematic review and meta-analysis. PSYCHOL HEALTH MED 2021; 27:1859-1874. [PMID: 34465255 DOI: 10.1080/13548506.2021.1971725] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The aim of this meta-analysis was to compare health-related quality of life (HRQoL) of Osteoarthritis (OA) patients and controls. A systematic literature search was performed on PubMed, Web of Science and EMBASE from database inception to 7 January 2020. Random effect model was performed to summarize the scores of each domain and the forest plot was used to compare the scores of OA patients with healthy controls. Subgroup analyses were conducted to explore the source of heterogeneity. Statistical analyses were executed using Review Manager (version 5.1). In total, six studies were included in this study, including 7094 patients with OA and 12 100 healthy controls, which were all reliable to summarize the scores of the Medical Outcomes Study 36-item Short-Form Health Survey (SF-36). Meta-analyses found that pooled mean HRQoL score for the SF-36 each domain (physical function, physical role function, body pain, general health, vitality, social function, emotional role function, mental health) was lower in patients with OA than in healthy controls, especially the score in the dimension of physical role function. OA have a substantial impact HRQoL. HRQoL is a significant component of measuring overall health, which contributes to formulate successful self-disease management plan, patient-centered care, and develop effective interventions target confidence.
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Affiliation(s)
- Hongsheng Yan
- Department of Orthopaedics, Jiangsu Rugao Boai Hospital, Nantong, Jiangsu, China
| | - Jiaxin Guo
- Nursing Department, The Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, China.,Research Center of Clinical Medicine, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China.,Research Center of Gerontology and Longevity, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Wei Zhou
- Research Center of Clinical Medicine, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China.,Research Center of Gerontology and Longevity, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Chen Dong
- Research Center of Clinical Medicine, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China.,Research Center of Gerontology and Longevity, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Jun Liu
- Department of Orthopaedics, Jiangsu Rugao Boai Hospital, Nantong, Jiangsu, China
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Lee GW, Lee KB. Does gender influence the outcomes of total ankle arthroplasty in patients with ankle osteoarthritis? J Orthop Surg Res 2020; 15:207. [PMID: 32503581 PMCID: PMC7275398 DOI: 10.1186/s13018-020-01731-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 05/27/2020] [Indexed: 12/11/2022] Open
Abstract
Background Total ankle arthroplasty has progressed as a treatment option for patients with ankle osteoarthritis. However, no studies have been conducted to evaluate the effect of gender on the outcome. The purpose of the present study was to evaluate outcomes, survivorship, and complications rates of total ankle arthroplasty, according to gender differences. Methods This study included 187 patients (195 ankles) that underwent mobile-bearing HINTEGRA prosthesis at a mean follow-up of 7.5 years (range, 4 to 14). The two groups consisted of a men’s group (106 patients, 109 ankles) and a women’s group (81 patients, 86 ankles). Average age was 64.4 years (range, 45 to 83). Results Clinical scores on the Ankle Osteoarthritis Scale for pain and disability, and American Orthopaedic Foot and Ankle Society ankle-hindfoot score improved and the difference was not statistically significant between the two groups at the final follow-up. There were no significant differences in complication rates and implant survivorship between the two groups. The overall survival rate was 96.4% in men and 93.4% in women at a mean follow-up of 7.5 years (p = 0.621). Conclusions Clinical outcomes, complication rates, and survivorship of total ankle arthroplasty were comparable between men and women. These results suggest that gender did not seem to affect outcomes of total ankle arthroplasty in patients with ankle osteoarthritis. Level of evidence Therapeutic level III
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Affiliation(s)
- Gun-Woo Lee
- Department of Orthopedic Surgery, Chonnam National University Medical School and Hospital, 42 Jebongro, Donggu, Gwangju, 61469, Republic of Korea
| | - Keun-Bae Lee
- Department of Orthopedic Surgery, Chonnam National University Medical School and Hospital, 42 Jebongro, Donggu, Gwangju, 61469, Republic of Korea.
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Do spatiotemporal parameters and gait variability differ across the lifespan of healthy adults? A systematic review. Gait Posture 2018; 64:181-190. [PMID: 29929161 DOI: 10.1016/j.gaitpost.2018.06.012] [Citation(s) in RCA: 131] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 06/08/2018] [Accepted: 06/10/2018] [Indexed: 02/02/2023]
Abstract
BACKGROUND Aging is often associated with changes in the musculoskeletal system, peripheral and central nervous system. These age-related changes often result in mobility problems influencing gait performance. Compensatory strategies are used as a way to adapt to these physiological changes. RESEARCH QUESTION The aim of this review is to investigate the differences in spatiotemporal and gait variability measures throughout the healthy adult life. METHODS This systematic review was conducted according to the PRISMA guidelines and registered in the PROSPERO database (no. CRD42017057720). Databases MEDLINE (Pubmed), Web of Science (Web of Knowledge), Cochrane Library and ScienceDirect were systematically searched until March 2018. RESULTS Eighteen of the 3195 original studies met the eligibility criteria and were included in this review. The majority of studies reported spatiotemporal and gait variability measures in adults above the age of 65, followed by the young adult population, information of middle-aged adults is lacking. Spatiotemporal parameters and gait variability measures were extracted from 2112 healthy adults between 18 and 98 years old and, in general, tend to deteriorate with increasing age. Variability measures were only reported in an elderly population and show great variety between studies. SIGNIFICANCE The findings of this review suggest that most spatiotemporal parameters significantly differ across different age groups. Elderly populations show a reduction of preferred walking speed, cadence, step and stride length, all related to a more cautious gait, while gait variability measures remain stable over time. A preliminary framework of normative reference data is provided, enabling insights into the influence of aging on spatiotemporal parameters, however spatiotemporal parameters of middle-aged adults should be investigated more thoroughly.
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Debi R, Elbaz A, Mor A, Kahn G, Peskin B, Beer Y, Agar G, Morag G, Segal G. Knee osteoarthritis, degenerative meniscal lesion and osteonecrosis of the knee: Can a simple gait test direct us to a better clinical diagnosis. Orthop Traumatol Surg Res 2017; 103:603-608. [PMID: 28330798 DOI: 10.1016/j.otsr.2017.02.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 02/07/2017] [Accepted: 02/09/2017] [Indexed: 02/02/2023]
Abstract
INTRODUCTION The purpose of the current study was to compare the gait patterns in patients with three differing knee pathologies - knee osteoarthritis (OA), degenerative meniscal lesion (DML) and spontaneous osteonecrosis of the knee (SONK) and a group of healthy controls. HYPOTHESIS A simple gait test will detect differences between different knee pathologies. MATERIAL AND METHODS Forty-seven patients with bilateral knee OA, 47 patients with DML, 28 patients with SONK and 27 healthy controls were included in this analysis. Patients underwent a spatiotemporal gait assessment and were asked to complete the Western Ontario and McMaster University (WOMAC) Index and the Short-Form (SF)-36 Health Survey. ANOVA tests, followed by Bonferroni multiple comparison tests and the Chi2 tests were performed for continuous and categorical variables, respectively. RESULTS Significant differences were found for all gait measures and clinical questionnaires between healthy controls and all knee conditions. Patients with SONK differed from patients with bilateral knee OA and DML in all gait measures and clinical questionnaires, except for WOMAC subscales. There were no significant differences between patients with bilateral knee OA and patients with DML. Symmetry was also examined and revealed asymmetry in some gait parameters in patients with SONK and DML. DISCUSSION Based on the differences in gait parameters that were found in the current study, adding an objective functional spatiotemporal gait test may assist in the diagnostic process of knee pathologies. TYPE OF STUDY Case Control study Level III.
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Affiliation(s)
- R Debi
- Department of Orthopedic Surgery, Barzliay Medical Center, Ashkelon, Israel
| | - A Elbaz
- AposTherapy Research Group, Herzliya, Israel
| | - A Mor
- AposTherapy Research Group, Herzliya, Israel.
| | - G Kahn
- Department of Orthopedic Surgery, Barzliay Medical Center, Ashkelon, Israel
| | - B Peskin
- Department of Orthopedic Surgery, Rambam Health Care Campus, Haifa, Israel
| | - Y Beer
- Department of Orthopedic Surgery, Assaf Harofeh Medical Center, Zerifin, Israel
| | - G Agar
- Department of Orthopedic Surgery, Assaf Harofeh Medical Center, Zerifin, Israel
| | - G Morag
- Department of Orthopedic Surgery, Sourasky Medical Center, Tel-Aviv, Israel
| | - G Segal
- AposTherapy Research Group, Herzliya, Israel
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Debi R, Mor A, Elbaz A, Segal G, Lubovsky O, Kahn G, Peskin B, Beer Y, Atoun E. Correlation between gait analysis and clinical questionnaires in patients with spontaneous osteonecrosis of the knee. Clin Biomech (Bristol, Avon) 2017; 44:90-93. [PMID: 28364675 DOI: 10.1016/j.clinbiomech.2017.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 03/05/2017] [Accepted: 03/16/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND Spontaneous osteonecrosis of the knee is usually verified by magnetic resonance imaging accompanied by clinical questionnaires to assess the level of pain and functional limitation. There is a lack however, in an objective functional test that will reflect the functional severity of spontaneous osteonecrosis of the knee. The purpose of the current study was to examine the correlation between spatiotemporal gait parameters and clinical questionnaires in patients with spontaneous osteonecrosis of the knee. METHODS 28 patients (16 females and 12 males) were included in the analysis. Patients had unilateral spontaneous osteonecrosis of the knee of the medial femoral condyle confirmed by magnetic resonance imaging. All patients performed a computerized spatiotemporal gait analysis and completed the Western Ontario and McMaster University Osteoarthritis Index and the Short-Form 36. Relationships between selected spatiotemporal gait measures and self-assessment questionnaires were assessed by Spearman non-parametric correlations. FINDINGS Significant correlations were found between selected spatiotemporal gait parameters and clinical questionnaires (r ranged between 0.28 and 0.79). Single limb support was the gait measure with the strongest correlation to pain (r=0.58), function (r=0.56) and quality of life. INTERPRETATION Spatiotemporal gait assessment for patients with spontaneous osteonecrosis of the knee correlates with the patient's level of pain and functional limitation there by adding objective information regarding the functional condition of these patients.
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Affiliation(s)
- Ronen Debi
- Department of Orthopedic Surgery, Barzliay Medical Center, Ashkelon, Israel
| | - Amit Mor
- AposTherapy Research Group, Herzliya, Israel.
| | - Avi Elbaz
- AposTherapy Research Group, Herzliya, Israel
| | - Ganit Segal
- AposTherapy Research Group, Herzliya, Israel
| | - Omri Lubovsky
- Department of Orthopedic Surgery, Barzliay Medical Center, Ashkelon, Israel
| | - Gadi Kahn
- Department of Orthopedic Surgery, Barzliay Medical Center, Ashkelon, Israel
| | - Bezalel Peskin
- Department of Orthopedic Surgery, Rambam Health Care Campus, Haifa, Israel
| | - Yiftah Beer
- Department of Orthopedic Surgery, Assaf Harofeh Medical Center, Zerifin, Israel
| | - Ehud Atoun
- Department of Orthopedic Surgery, Barzliay Medical Center, Ashkelon, Israel
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Atoun E, Mor A, Segal G, Debi R, Grinberg D, Benedict Y, Rozen N, Beer Y, Elbaz A. A non-invasive, home-based biomechanical therapy for patients with spontaneous osteonecrosis of the knee. J Orthop Surg Res 2016; 11:139. [PMID: 27842560 PMCID: PMC5109820 DOI: 10.1186/s13018-016-0472-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 10/29/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The purpose of the current study was to examine the effect of a non-invasive, home-based biomechanical treatment program for patients with spontaneous osteonecrosis of the knee (SONK). METHODS Seventeen patients with SONK, confirmed by MRI, participated in this retrospective analysis. Patients underwent a spatiotemporal gait analysis and completed the Western Ontario and McMaster University Osteoarthritis Index (WOMAC) and the Short-Form-36 (SF-36). Following an initial assessment, patients commenced the biomechanical treatment (AposTherapy). All patients were reassessed after 3 and 6 months of treatment. RESULTS A significant reduction in pain and improvement in function was seen after 3 months of therapy with additional improvement after 6 months of therapy. Pain was reduced by 53% and functional limitation reduced by 43%. Furthermore, a significant improvement was also found in the SF-36 subscales, including the summary of physical and mental scores. Significant improvements were found in most of the gait parameters including a 41% increase in gait velocity and a 22% increase in step length. Patients also demonstrated improvement in limb symmetry, especially by increasing the single limb support of the involved limb. CONCLUSIONS Applying this therapy allowed patients to be active, while walking more symmetrically and with less pain. With time, the natural course of the disease alongside the activity of the patients with the unique biomechanical device led to a significant reduction in pain and improved gait patterns. Therefore, we believe AposTherapy should be considered as a treatment option for patients with SONK. TRIAL REGISTRATION Assaf Harofeh Medical Center Institutional Helsinki Committee Registry, 141/08; ClinicalTrials.gov NCT00767780 .
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Affiliation(s)
- Ehud Atoun
- Department of Orthopedic Surgery, Barzilai Medical Center, Ashkelon, Israel
| | - Amit Mor
- AposTherapy Research Group, 1 Abba Even Blvd., 46733, Herzliya, Israel.
| | - Ganit Segal
- AposTherapy Research Group, 1 Abba Even Blvd., 46733, Herzliya, Israel
| | - Ronen Debi
- Department of Orthopedic Surgery, Barzilai Medical Center, Ashkelon, Israel
| | - Dan Grinberg
- Department of Orthopedic Surgery, Barzilai Medical Center, Ashkelon, Israel
| | - Yeshaiau Benedict
- Department of Orthopedic Surgery, Barzilai Medical Center, Ashkelon, Israel
| | - Nimrod Rozen
- Department of Orthopedic Surgery, HaEmek Medical Center, Afula, Israel
| | - Yiftah Beer
- Department of Orthopedic Surgery, Assaf Harofeh Medical Center, Zerifin, Israel
| | - Avi Elbaz
- AposTherapy Research Group, 1 Abba Even Blvd., 46733, Herzliya, Israel
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Joseph GB, Hilton JF, Jungmann PM, Lynch JA, Lane NE, Liu F, McCulloch CE, Tolstykh I, Link TM, Nevitt MC. Do persons with asymmetric hip pain or radiographic hip OA have worse pain and structure outcomes in the knee opposite the more affected hip? Data from the Osteoarthritis Initiative. Osteoarthritis Cartilage 2016; 24:427-35. [PMID: 26497607 PMCID: PMC4761312 DOI: 10.1016/j.joca.2015.10.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 09/18/2015] [Accepted: 10/08/2015] [Indexed: 02/02/2023]
Abstract
PURPOSE To determine if asymmetry between hips in pain or radiographic osteoarthritis (RHOA) is associated with worse pain and joint space narrowing (JSN) at baseline and longitudinally in knees contralateral to more affected hips. METHODS We studied 279 participants in the Osteoarthritis Initiative with baseline asymmetry between hips in pain and 483 with asymmetry in RHOA none of whom had a hip replacement for ≥4 years after baseline. RHOA assessed from pelvis radiographs was categorized as none, possible or definite and hip pain on most days of a month in the past year as present/absent. Knee pain (WOMAC scale) and JSN (fixed flexion radiographs) were categorized as none, mild and moderate-severe. We compared knees contralateral and ipsilateral to more affected hips on baseline knee pain and JSN using clustered multinomial regression and on change in knee pain and JSN over 4-5 years using generalized linear and logistic estimating equations. RESULTS Knees contralateral to painful hips had less baseline pain ("moderate-severe" vs "none", relative risk ratio [RRR]: 0.39, 95% CI = 0.27-0.57), but greater baseline JSN ("moderate-severe" vs "none", RRR: 1.62, 95% CI = 1.09-2.38) and greater worsening of pain during follow-up (P = 0.001). Knees contralateral to hips with worse RHOA had nonsignificant trends for greater baseline JSN (P = 0.10) and JSN progression (P = 0.17). CONCLUSION These findings provide limited support for the hypothesis that early asymmetry in hip pain and RHOA is associated with worse pain and structural outcomes in knees contralateral to the more affected hip.
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Affiliation(s)
- G B Joseph
- Musculoskeletal and Quantitative Imaging Research, Department of Radiology and Biomedical Imaging, University of California San Francisco, 185 Berry Street, Suite 350, San Francisco, CA 94107, USA
| | - J F Hilton
- Department of Epidemiology and Biostatistics, University of California San Francisco, Mission Hall, 550 16th St. 2nd Floor, Campus Box #0560 San Francisco, CA 94158, USA
| | - P M Jungmann
- Department of Radiology, Technische Universitaet Muenchen, Ismaninger Strasse 22, 81675 Munich, Germany
| | - J A Lynch
- Department of Epidemiology and Biostatistics, University of California San Francisco, Mission Hall, 550 16th St. 2nd Floor, Campus Box #0560 San Francisco, CA 94158, USA
| | - N E Lane
- Department of Internal Medicine, UC Davis Medical Center, Sacramento, CA 95817, USA
| | - F Liu
- Department of Epidemiology and Biostatistics, University of California San Francisco, Mission Hall, 550 16th St. 2nd Floor, Campus Box #0560 San Francisco, CA 94158, USA
| | - C E McCulloch
- Department of Epidemiology and Biostatistics, University of California San Francisco, Mission Hall, 550 16th St. 2nd Floor, Campus Box #0560 San Francisco, CA 94158, USA
| | - I Tolstykh
- Department of Epidemiology and Biostatistics, University of California San Francisco, Mission Hall, 550 16th St. 2nd Floor, Campus Box #0560 San Francisco, CA 94158, USA
| | - T M Link
- Musculoskeletal and Quantitative Imaging Research, Department of Radiology and Biomedical Imaging, University of California San Francisco, 185 Berry Street, Suite 350, San Francisco, CA 94107, USA
| | - M C Nevitt
- Department of Epidemiology and Biostatistics, University of California San Francisco, Mission Hall, 550 16th St. 2nd Floor, Campus Box #0560 San Francisco, CA 94158, USA.
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