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Li M, Zeng Y, Nie Y, Liao K, Pei F, Yang J, Xie H, Shen B. A high risk of postoperative periprosthetic femoral fracture in Dorr type C femurs: a retrospective cohort study with 10-year follow-up data and a preliminary monochromatic image analysis. Int J Surg 2024; 110:296-305. [PMID: 37830949 PMCID: PMC10793812 DOI: 10.1097/js9.0000000000000810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Accepted: 09/18/2023] [Indexed: 10/14/2023]
Abstract
BACKGROUND The authors applied Anatomique Benoist Girard II (ABG II) stems for total hip arthroplasty in some Dorr type C femurs as early attempts. Here, the authors compared the long-term follow-up results between ABG II stems and the 'well-performing' Corail stems and their monochromatic images. METHODS Among 3214 primary total hip arthroplasty records, 43 short ABG II stems and 67 standard-length Corail stems implanted in Dorr type C femurs were eligible and enrolled in this retrospective cohort study, with a mean follow-up of 10.3 years. Revision rates, Harris hip scores, and radiologic signs were compared. Spectral CT scans from a representative sample were obtained, and monochromatic images were reconstructed. A quantitative method was developed to measure the volume of the gap around stems. Patient-specific finite element analysis was conducted to investigate the strains. RESULTS The revision rate of ABG II stems was significantly higher than that of Corail stems (21 vs. 3%, P <0.05). In the monochromatic images, fewer spot-weld signs (2.2 vs. 3.4, P <0.05) and wider gaps around stems (1.64 cm 3 vs. 0.13 cm 3 , P <0.05) were observed on average in the ABG II group. The mean maximum principal strains of the proximal femurs in the ABG II group were close to the yield strains and significantly larger than those in the Corail group (0.0052 vs. 0.0011, P <0.05). CONCLUSIONS There was a high risk of postoperative periprosthetic femoral fracture for ABG II stems in Dorr type C femurs. Monochromatic images provided some insight into the failure mechanism. LEVEL OF EVIDENCE III.
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Affiliation(s)
- Mingyang Li
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital
| | - Yi Zeng
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital
| | - Yong Nie
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital
| | - Kai Liao
- Department of Radiology, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan Province, People’s Republic of China
| | - Fuxing Pei
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital
| | - Jing Yang
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital
| | - Huiqi Xie
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital
| | - Bin Shen
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital
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Huang CC, Cheng CK, Wei HW. A Time-Dependent Design Concept of a Cementless Hip Stem Prosthesis for Improving Physiological Load Transfer in Proximal Femur: A Finite Element Analysis. J Med Biol Eng 2022. [DOI: 10.1007/s40846-022-00728-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Lamb JN, Coltart O, Adekanmbi I, Pandit HG, Stewart T. Comparison of axial-rotational postoperative periprosthetic fracture of the femur in composite osteoporotic femur versus human cadaveric specimens: A validation study. Proc Inst Mech Eng H 2022; 236:973-978. [PMID: 35603754 PMCID: PMC9289970 DOI: 10.1177/09544119221092842] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Postoperative periprosthetic femoral fracture following hip replacement has been the subject of many varied experimental approaches. Cadaveric samples offer realistic fit and fracture patterns but are subject to large between-sample variation. Composite femurs have not yet been validated for this purpose. We compared the results of composite femurs to cadaveric femurs using an established methodology. In vitro postoperative periprosthetic fracture results using axial-rotational loading were compared between 12 composite femurs and nine fresh frozen femurs, which were implanted with an otherwise identical collarless (6 composite vs 4 cadaveric) or collared (6 composite vs 5 cadaveric) cementless femoral stem using identical methodology. Fracture torque and rotational displacement were measured and torsional stiffness and rotational work prior to fracture were estimated. Fractures patterns were graded according to the Unified Classification System. Fracture torque, displacement, torsional stiffness and fracture patterns for cadaveric and composite femurs were similar between groups. There was a trend for a greater rotational displacement in the cadaveric groups, which lead to a decrease in torsional stiffness and a significantly greater rotational work prior to fracture for all cadaveric specimens (collarless stems: 10.51 [9.71 to 12.57] vs 5.21 [4.25 to 6.04], p = 0.01 and for collared stems: 15.38 [14.01 to 17.05] vs 5.76 [4.92 to 6.64], p = 0.01). Given comparable fracture torque and the similarity in fracture patterns for fracture trials using composite samples versus cadaveric femurs, the use of composite femur models may be a reasonable choice for postoperative periprosthetic femoral fracture studies within certain limitations.
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Affiliation(s)
- Jonathan N Lamb
- Leeds Institute of Rheumatic and Musculoskeletal Medicine (LIRMM), School of medicine, University of Leeds, Leeds, UK
| | - Oliver Coltart
- School of Mechanical Engineering, University of Leeds, Leeds, UK
| | | | - Hemant G Pandit
- Leeds Institute of Rheumatic and Musculoskeletal Medicine (LIRMM), School of medicine, University of Leeds, Leeds, UK
| | - Todd Stewart
- School of Mechanical Engineering, University of Leeds, Leeds, UK
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Ezechieli M, Windhagen H, Matsubara M, Budde S, Wirries N, Sungu M. A neck-preserving short stem better reconstructs the centre of rotation than straight stems: a computed tomography-based cadaver study. Arch Orthop Trauma Surg 2022; 142:1669-1680. [PMID: 34231044 DOI: 10.1007/s00402-021-03957-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 05/10/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Short femoral hip stems with a metaphyseal anchoring concept have been designed to treat younger patients with good bone quality. The aim of this study was to reconstruct the centre of rotation and soft tissue balancing and preserve bone in the long-term perspective. MATERIALS AND METHODS Eighteen human femurs were randomised into three groups: (1) metaphyseal anchoring short stem, (2) shortened straight stem, (3) straight stem). Prior to the implantation of the hip stems, a computed tomography (CT) of the bones was performed and the femoral ante-torsion and ante-tilt was measured and compared to the results of the post-implantation CT. This could be calculated based on the 3D coordinates taken from the pre- and post-op CT scans, which were transformed into the same coordinate systems. RESULTS The mean preoperative caput-collum-diaphyseal (CCD) angle for the three groups was 126.87° ± 3.50° (Group 3: 129.64° ± 3.53°, Group 1: 123.76° ± 5.56°, Group 2: 127.53° ± 1.42°) and was consistent with published reports. The postoperative CCD angles with 126.85° ± 3.43° were within a very good reconstruction range for all three groups. The anterior offset comparison among these three groups showed significant difference in reconstruction. The smallest difference between the anatomical (preoperative) and postoperative condition was seen in Group 1 (1.47° ± 0.60°), followed by Group 2 (3.60° ± 0.23°) and Group 3 (8.00° ± 0.70°) groups. The horizontal offset showed no significant difference among the groups and was within the window of ± 5 mm. CONCLUSION In this cadaver study, we found that the metaphyseal anchoring, partially neck-preserving short hip stem best reconstructs the ante-torsion and the ante-tilt of the femoral neck. Therefore, it can be a useful stem in younger or active middle-aged patients.
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Affiliation(s)
- M Ezechieli
- Vincenz Krankenhaus Paderborn, Standort Salzkotten, Dr.-Krismann-Strasse 12, 33154, Salzkotten, Germany. .,Orthopaedic Clinic Medical School Hannover, Hannover, Germany.
| | - H Windhagen
- Orthopaedic Clinic Medical School Hannover, Hannover, Germany
| | | | - S Budde
- Orthopaedic Clinic Medical School Hannover, Hannover, Germany
| | - N Wirries
- Orthopaedic Clinic Medical School Hannover, Hannover, Germany
| | - M Sungu
- Expert and Product Management Department, BBraun Aesculap, Tuttlingen, Germany
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Nandi S, Shah A, Joukar A, Becker K, Crutchfield C, Goel V. Short single-wedge stems have higher risk of periprosthetic fracture than other cementless stem designs in Dorr type A femurs: a finite element analysis. Hip Int 2022; 32:298-303. [PMID: 32865039 DOI: 10.1177/1120700020949185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND The use of total hip arthroplasty (THA) femoral stems that transmit force in a favourable manner to the femur may minimise periprosthetic fractures. Finite element analysis (FEA) is a computerised method that analyses the effect of forces applied to a structure with complex shape. Our aim was to apply FEA to compare primary THA cementless stem designs and their association with periprosthetic fracture risk. METHODS 3-dimensional (3D) models of a Dorr Type A femur and 5 commonly used primary THA cementless stem designs (short single wedge, standard-length single wedge, modular, double-wedge metaphyseal filling, and cylindrical fully coated) were developed using computed tomography (CT) imaging. Implant insertion, single-leg stance, and twisting with a planted foot were simulated. FEA was performed, and maximum femoral strain along the implant-bone interface recorded. RESULTS Femoral strain was highest with short single-wedge stem design (0.3850) and lowest with standard-length single-wedge design (0.0520). Location of maximum femoral strain varied by stem design, but not with implant insertion, single-leg stance, or twisting with a planted foot. Strain was as high during implant insertion as with single-leg stance or twisting with a planted foot. CONCLUSIONS Our results suggest the risk of intraoperative and postoperative periprosthetic fracture with THA in a Dorr A femur is highest with short single-wedge stems and lowest with standard-length single-wedge stems. Consideration may be given to minimising the use of short single-wedge stems in THA. Implant-specific sites of highest strain should be carefully inspected for fracture.
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Affiliation(s)
- Sumon Nandi
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Anoli Shah
- Department of Bioengineering, University of Toledo College of Engineering, Toledo, OH, USA
| | - Amin Joukar
- Purdue University School of Mechanical Engineering, West Lafayette, IN, USA
| | - Kevin Becker
- Department of Bioengineering, University of Toledo College of Engineering, Toledo, OH, USA
| | - Cody Crutchfield
- Department of Bioengineering, University of Toledo College of Engineering, Toledo, OH, USA
| | - Vijay Goel
- Department of Bioengineering, University of Toledo College of Engineering, Toledo, OH, USA
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Schopper C, Luger M, Hipmair G, Schauer B, Gotterbarm T, Klasan A. The race for the classification of proximal periprosthetic femoral fractures : Vancouver vs Unified Classification System (UCS) - a systematic review. BMC Musculoskelet Disord 2022; 23:280. [PMID: 35321671 PMCID: PMC8944079 DOI: 10.1186/s12891-022-05240-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 03/16/2022] [Indexed: 11/10/2022] Open
Abstract
Background Periprosthetic femoral fractures (PFFs) represent a major cause for surgical revision after hip arthroplasty with detrimental consequences for patients. The Vancouver classification has been traditionally used since its introduction in 1995. The Unified Classification System (UCS) was described in 2014, to widen the spectrum by aiming for a more comprehensive approach. The UCS also aimed to replace the Vancouver classification by expanding the idea of the Vancouver classification to the whole musculoskeletal apparatus. After introduction of the UCS, the question was raised, whether the UCS found its place in the field of analysing PFFs. Therefore, this systematic review was performed to investigate, the use of the UCS compared to the established Vancouver classification. Methods Medline was searched for reports published between 1 January 2016 and 31 November 2020, without language restriction. Included were original articles, irrespective of the level of evidence and case reports reporting on a PFF and using either the Vancouver or the UCS to classify the fractures. Excluded were reviews and systematic reviews. Results One hundred forty-six studies were included in the analysis. UCS has not been used in a single registry study, giving a pooled cohort size of 3299 patients, compared to 59,178 patients in studies using the Vancouver classification. Since 2016, one study using UCS was published in a top journal, compared to 37 studies using the Vancouver classification (p=0.29). During the study period, the number of yearly publications remained stagnant (p=0.899). Conclusions Despite valuable improvement and expansion of the latter UCS, to date, the Vancouver system clearly leads the field of classifying PFFs in the sense of the common use. Supplementary Information The online version contains supplementary material available at 10.1186/s12891-022-05240-w.
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Affiliation(s)
- Clemens Schopper
- Department for Orthopaedics and Traumatology, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstrasse 9, 4020 Linz and Altenberger Strasse 69, 4040, Linz, Austria
| | - Matthias Luger
- Department for Orthopaedics and Traumatology, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstrasse 9, 4020 Linz and Altenberger Strasse 69, 4040, Linz, Austria.
| | - Günter Hipmair
- Department for Orthopaedics and Traumatology, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstrasse 9, 4020 Linz and Altenberger Strasse 69, 4040, Linz, Austria
| | - Bernhard Schauer
- Department for Orthopaedics and Traumatology, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstrasse 9, 4020 Linz and Altenberger Strasse 69, 4040, Linz, Austria
| | - Tobias Gotterbarm
- Department for Orthopaedics and Traumatology, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstrasse 9, 4020 Linz and Altenberger Strasse 69, 4040, Linz, Austria
| | - Antonio Klasan
- Department for Orthopaedics and Traumatology, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstrasse 9, 4020 Linz and Altenberger Strasse 69, 4040, Linz, Austria
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Holzapfel BM, Rak D, Kreuzer S, Arnholdt J, Thaler M, Rudert M. Short stem hip arthroplasty via the minimally invasive direct anterior approach. OPERATIVE ORTHOPADIE UND TRAUMATOLOGIE 2021; 33:288-303. [PMID: 34251469 DOI: 10.1007/s00064-021-00723-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 02/12/2021] [Accepted: 02/25/2021] [Indexed: 12/21/2022]
Abstract
OBJECTIVE Tissue-sparing, minimally invasive hip arthroplasty via the direct anterior approach (DAA) using a partially neck-preserving, calcar-guided short stem. INDICATIONS Primary and secondary osteoarthritis of the hip due to developmental dysplasia, femoroacetabular impingement, femoral head necrosis or trauma sequelae. CONTRAINDICATIONS Severe osteoporosis, active infection, American Society of Anesthesiologists (ASA) > III, large metaphyseal bone defects, severe metaphyseal deformities, Dorr type C femur. SURGICAL TECHNIQUE Supine position on a standard operating table without extension device. Classic DAA skin incision or bikini incision distal to the inguinal fold. Blunt dissection entering the Hueter interval. Capsulotomy with capsule preservation or partial capsulectomy. Intraoperatively, it is crucial to adhere to the preoperatively planned angle and height of the femoral neck osteotomy. During femoral head removal and acetabular preparation, care must be taken to avoid iatrogenic damage to the remaining neck. After cup positioning, femoral access is achieved by release of superior capsular structures. During opening of the medullary canal and broaching, femoral torsion and axis have to be taken into account for correct rotational and axial alignment. Femoral broaches are inserted in an ascending series of sizes until the last broach is firmly lodged and is in direct contact with the antero-medial femoral neck cortex. Fluoroscopic control in two planes to check for femoral anatomic and overall offset and assess whether the implant is adequately seated with cortical support at the calcar, the distal lateral and the dorsal cortex. Implantation of the definitive implants, local infiltration analgesia and wound closure. RESULTS Between 1/2011 and 12/2016 60 patients (24 female, 36 male; mean age 44 years) were treated with a partially neck-preserving short stem via the described approach. Seven patients underwent a bi-lateral procedure. Thus, 67 procedures were analysed in this retrospective cohort study. Mean follow-up was 70 months (range 28-93). The median Harris Hip Score was 48 (range 11-88) preoperatively and 98 (range 80-100) postoperatively. CONCLUSION The minimally invasive implantation of a partially neck-preserving stem via DAA provides a safe technique with good to excellent clinical results in the mid-term.
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Affiliation(s)
- Boris Michael Holzapfel
- Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany.
| | - Dominik Rak
- Department of Orthopaedic Surgery, University of Wuerzburg, Koenig-Ludwig-Haus, Brettreichstr. 11, 97074, Wuerzburg, Germany
| | - Stefan Kreuzer
- Memorial Bone & Joint Clinic, The University of Texas Health Science Center at Houston Medical School, 1140 Business Center Drive, Suite 101, 77043, Houston, TX, USA
| | - Joerg Arnholdt
- Department of Orthopaedic Surgery, University of Wuerzburg, Koenig-Ludwig-Haus, Brettreichstr. 11, 97074, Wuerzburg, Germany
| | - Martin Thaler
- Department of Orthopaedic and Trauma Surgery, Medical University Innsbruck, Anichstr. 35, 6020, Innsbruck, Austria
| | - Maximilian Rudert
- Department of Orthopaedic Surgery, University of Wuerzburg, Koenig-Ludwig-Haus, Brettreichstr. 11, 97074, Wuerzburg, Germany
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Lamb JN, Coltart O, Adekanmbi I, Pandit HG, Stewart T. Calcar-collar contact during simulated periprosthetic femoral fractures increases resistance to fracture and depends on the initial separation on implantation: A composite femur in vitro study. Clin Biomech (Bristol, Avon) 2021; 87:105411. [PMID: 34144390 DOI: 10.1016/j.clinbiomech.2021.105411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 06/08/2021] [Accepted: 06/08/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND A calcar collar may reduce risk of periprosthetic fracture of the femur, through collar contact. We estimated the effect of collar contact on periprosthetic fracture mechanics using a collared fully coated cementless femoral stem and then estimated the effect of initial calcar-collar separation on the likelihood of collar contact. METHODS Three groups of six composite left femurs with increasing calcar-collar separation in each group, underwent periprosthetic fracture simulation in a materials testing machine. Fracture torque and rotational displacement were measured and torsional stiffness and rotational work prior to fracture were estimated. Calcar collar contact prior to fracture was identified using high speed camera footage. FINDINGS Where calcar-collar contact occurred fracture torque was greater (47.33 [41.03 to 50.45] Nm versus 38.26 [33.70 to 43.60] Nm, p = 0.05), Rotational displacement was less (16.6 [15.5 to 22.3] degrees versus 21.2 [18.9 to 28.1] degrees, p = 0.07), torsional stiffness was greater (151.38 [123.04 to 160.42] rad.Nm-1 versus 96.86 [84.65 to 112.98] rad.Nm-1, p < 0.01) and rotational work was similar (5.88 [4.67, 6.90] J versus 5.31 [4.40, 6.56] J, p = 0.6). Odds ratio (OR) of not achieving collar contact (95% confidence interval) increased 3.8 fold (95% CI 1.6 to 30.2, p < 0.05) for each millimetre of separation in the regression model. 95% chance of collar contact was associated with a separation of 1 mm or less. INTERPRETATION Surgeons should reduce calcar-collar separation at stem implantation to a maximum of 1 mm to increase the chance of calcar-collar contact during injury and reduce the risk of early post-operative femoral fracture.
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Affiliation(s)
- Jonathan N Lamb
- Leeds Institute of Rheumatic and Musculoskeletal Medicine (LIRMM), School of Medicine, University of Leeds, Chapel Allerton Hospital, Leeds LS7 4SA, UK.
| | - Oliver Coltart
- School of Mechanical Engineering, University of Leeds, Leeds LS2 9DX, UK
| | - Isaiah Adekanmbi
- DePuy International, Johnson and Johnson, St Anthony's Rd, Leeds LS11 8DT, UK
| | - Hemant G Pandit
- Leeds Institute of Rheumatic and Musculoskeletal Medicine (LIRMM), School of Medicine, University of Leeds, Chapel Allerton Hospital, Leeds LS7 4SA, UK
| | - Todd Stewart
- School of Mechanical Engineering, University of Leeds, Leeds LS2 9DX, UK
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Kwak DK, Bang SH, Lee SJ, Park JH, Yoo JH. Effect of stem position and length on bone-stem constructs after cementless hip arthroplasty. Bone Joint Res 2021; 10:250-258. [PMID: 33820433 PMCID: PMC8076980 DOI: 10.1302/2046-3758.104.bjr-2020-0043.r3] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Aims There are concerns regarding initial stability and early periprosthetic fractures in cementless hip arthroplasty using short stems. This study aimed to investigate stress on the cortical bone around the stem and micromotions between the stem and cortical bone according to femoral stem length and positioning. Methods In total, 12 femoral finite element models (FEMs) were constructed and tested in walking and stair-climbing. Femoral stems of three different lengths and two different positions were simulated, assuming press-fit fixation within each FEM. Stress on the cortical bone and micromotions between the stem and bone were measured in each condition. Results Stress concentration was observed on the medial and lateral interfaces between the cortical bone and stem. With neutral stem insertion, mean stress over a region of interest was greater at the medial than lateral interface regardless of stem length, which increased as the stem shortened. Mean stress increased in the varus-inserted stems compared to the stems inserted neutrally, especially at the lateral interface in contact with the stem tip. The maximum stress was observed at the lateral interface in a varus-inserted short stem. All mean stresses were greater in stair-climbing condition than walking. Each micromotion was also greater in shorter stems and varus-inserted stems, and in stair-climbing condition. Conclusion The stem should be inserted neutrally and stair-climbing movement should be avoided in the early postoperative period, in order to preserve early stability and reduce the possibility of thigh pain, especially when using a shorter stem. Cite this article: Bone Joint Res 2021;10(4):250–258.
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Affiliation(s)
- Dae-Kyung Kwak
- Department of Orthopaedic Surgery, Hallym University Sacred Heart Hospital, Anyang, South Korea
| | - Sun-Hee Bang
- Department of Biomedical Engineering, Inje University, Gimhae, South Korea
| | - Sung-Jae Lee
- Department of Biomedical Engineering, Inje University, Gimhae, South Korea
| | - Ji-Hun Park
- Department of Orthopaedic Surgery, Hallym University Sacred Heart Hospital, Anyang, South Korea
| | - Je-Hyun Yoo
- Department of Orthopaedic Surgery, Hallym University Sacred Heart Hospital, Anyang, South Korea
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Freitag T, Kutzner KP, Bieger R, Reichel H, Ignatius A, Dürselen L. Biomechanics of a cemented short stem: a comparative in vitro study regarding primary stability and maximum fracture load. Arch Orthop Trauma Surg 2021; 141:1797-1806. [PMID: 33755800 PMCID: PMC8437915 DOI: 10.1007/s00402-021-03843-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 02/20/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE In total hip arthroplasty, uncemented short stems have been used more and more frequently in recent years. Especially for short and curved femoral implants, bone-preserving and soft tissue-sparing properties are postulated. However, indication is limited to sufficient bone quality. At present, there are no curved short stems available which are based on cemented fixation. METHODS In this in vitro study, primary stability and maximum fracture load of a newly developed cemented short-stem implant was evaluated in comparison to an already well-established cemented conventional straight stem using six pairs of human cadaver femurs with minor bone quality. Primary stability, including reversible micromotion and irreversible migration, was assessed in a dynamic material-testing machine. Furthermore, a subsequent load-to-failure test revealed the periprosthetic fracture characteristics. RESULTS Reversible and irreversible micromotions showed no statistical difference between the two investigated stems. All short stems fractured under maximum load according to Vancouver type B3, whereas 4 out of 6 conventional stems suffered a periprosthetic fracture according to Vancouver type C. Mean fracture load of the short stems was 3062 N versus 3160 N for the conventional stems (p = 0.84). CONCLUSION Primary stability of the cemented short stem was not negatively influenced compared to the cemented conventional stem and no significant difference in fracture load was observed. However, a clear difference in the fracture pattern has been identified.
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Affiliation(s)
- Tobias Freitag
- Department of Orthopaedic Surgery, University of Ulm, Oberer Eselsberg 45, 89081, Ulm, Germany.
| | - Karl Philipp Kutzner
- Department of Orthopaedic Surgery and Traumatology, St. Josefs Hospital Wiesbaden, Beethovenstr. 20, 65189, Wiesbaden, Germany
| | - Ralf Bieger
- Department of Orthopaedic Surgery, University of Ulm, Oberer Eselsberg 45, 89081, Ulm, Germany
| | - Heiko Reichel
- Department of Orthopaedic Surgery, University of Ulm, Oberer Eselsberg 45, 89081, Ulm, Germany
| | - Anita Ignatius
- Institute of Orthopaedic Research and Biomechanics, Trauma Research Centre Ulm, Ulm University, Medical Centre, Helmholtzstr. 14, 89081, Ulm, Germany
| | - Lutz Dürselen
- Institute of Orthopaedic Research and Biomechanics, Trauma Research Centre Ulm, Ulm University, Medical Centre, Helmholtzstr. 14, 89081, Ulm, Germany
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Wiik AV, Aqil A, Al-Obaidi B, Brevadt M, Cobb JP. The impact of reducing the femoral stem length in total hip arthroplasty during gait. Arch Orthop Trauma Surg 2021; 141:1993-2000. [PMID: 33760941 PMCID: PMC8497290 DOI: 10.1007/s00402-021-03852-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 03/01/2021] [Indexed: 11/29/2022]
Abstract
AIM The length of the femoral stem in total hip arthroplasty (THA) is a practical consideration to prevent gait impairment. The aim of this study was to determine if reducing the femoral stem length in THA would lead to impaired gait biomechanics. METHODS Patients uniformly with the same brand implant of differing lengths (100 mm vs 140-166 mm) were taken retrospectively from a prospective trial introducing a new short stem. Twelve patients without any other disorder to alter gait besides contralateral differing length stem THA were tested at differing gradients and speed on a validated instrumented treadmill measuring ground reaction forces. An anthropometrically similar group of healthy controls were analysed to compare. RESULTS With the same posterior surgical approach, the offset and length of both hips were reconstructed within 5 mm of each other with an identical mean head size of 36 mm. The short stem was the last procedure for all the hips with gait analysis occurring at a mean of 31 and 79 months postoperatively for the short and long stem THA, respectively. Gait analysis between limbs of both stem lengths demonstrated no statistical difference during any walking condition. In the 90 gait assessments with three loading variables, the short stem was the favoured side 51% of the time compared 49% for the long stem. CONCLUSION By testing a range of practical walking activities, no lower limb loading differences can be observed by reducing the femoral stem length. A shorter stem demonstrates equivalence in preference during gait when compared to a reputable conventional stem in total hip arthroplasty.
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Affiliation(s)
- Anatole Vilhelm Wiik
- MSK Lab, Imperial College London, Michael Uren Hub, 2nd Floor, White City Campus, Wood Lane, London, W12 0BZ UK
| | - Adeel Aqil
- MSK Lab, Imperial College London, Michael Uren Hub, 2nd Floor, White City Campus, Wood Lane, London, W12 0BZ UK
| | - Bilal Al-Obaidi
- MSK Lab, Imperial College London, Michael Uren Hub, 2nd Floor, White City Campus, Wood Lane, London, W12 0BZ UK
| | - Mads Brevadt
- MSK Lab, Imperial College London, Michael Uren Hub, 2nd Floor, White City Campus, Wood Lane, London, W12 0BZ UK
| | - Justin Peter Cobb
- MSK Lab, Imperial College London, Michael Uren Hub, 2nd Floor, White City Campus, Wood Lane, London, W12 0BZ UK
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