Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion study
Abstract Background Many motion studies have shown that the inner bearing of bipolar prostheses moves less than expected under non-weight-bearing and static weight-bearing positions, which are not routine functional movements performed postoperatively. The aim of this study was to investigate the be...
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| Format: | Article |
| Language: | English |
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BMC
2020-11-01
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| Series: | BMC Musculoskeletal Disorders |
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| Online Access: | http://link.springer.com/article/10.1186/s12891-020-03749-6 |
| _version_ | 1818348672084082688 |
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| author | Weizhou Jiang Jun Xiao Bin Chen Ming Jia Yang Zhang Jian Wang Zhanjun Shi |
| author_facet | Weizhou Jiang Jun Xiao Bin Chen Ming Jia Yang Zhang Jian Wang Zhanjun Shi |
| author_sort | Weizhou Jiang |
| collection | DOAJ |
| description | Abstract Background Many motion studies have shown that the inner bearing of bipolar prostheses moves less than expected under non-weight-bearing and static weight-bearing positions, which are not routine functional movements performed postoperatively. The aim of this study was to investigate the behaviours of bipolar prostheses during normal gait and simulative squatting. Methods Thirty-one femoral neck fracture patients were enrolled, and fluoroscopy examinations of walking on a treadmill, simulative squatting, and non-weight-bearing abduction-adduction and flexion-extension motions were performed at an average of 40 months postoperatively. The rate of acetabular cartilage degeneration was calculated. The ranges of motion of the outer bearing and inner bearing were determined, and the O/I ratios were calculated. Clinical efficacy was assessed by HHS and EQ-5D score. Results The inner bearing moved more than the outer bearing did, with an O/I ratio of 0.81, during the normal gait examination, while the motion of the outer bearing was obviously dominant during the simulative squatting and non-weight-bearing abduction-adduction and flexion-extension examinations. The mean acetabular cartilage degeneration rate was 0.82 ± 0.54 mm/year at the follow-up. In subgroup analyses, the motion of the outer bearing decreased to some extent with the increase in acetabular wear, and the corresponding O/I ratios among the groups showed a trend of decreasing first and then increasing. The HHS and EQ-5D scores of the patients with osteolysis and femoral stem loosening were much worse than those with fixed implants. Conclusion Bipolar prostheses do function as originally intended during gait, but movement primarily occurs at the outer bearing during other examinations. The motion patterns of bipolar prostheses change with the increase in acetabular wear. |
| first_indexed | 2024-12-13T17:53:46Z |
| format | Article |
| id | doaj.art-fcf2617879a44f02adc45139f41f5c30 |
| institution | Directory Open Access Journal |
| issn | 1471-2474 |
| language | English |
| last_indexed | 2024-12-13T17:53:46Z |
| publishDate | 2020-11-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Musculoskeletal Disorders |
| spelling | doaj.art-fcf2617879a44f02adc45139f41f5c302022-12-21T23:36:26ZengBMCBMC Musculoskeletal Disorders1471-24742020-11-012111910.1186/s12891-020-03749-6Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion studyWeizhou Jiang0Jun Xiao1Bin Chen2Ming Jia3Yang Zhang4Jian Wang5Zhanjun Shi6Department of Orthopaedics, Nanfang Hospital, Southern Medical UniversityDepartment of Orthopaedics, Nanfang Hospital, Southern Medical UniversityDepartment of Orthopaedics, Nanfang Hospital, Southern Medical UniversityDepartment of Radiology, Nanfang Hospital, Southern Medical UniversityDepartment of Orthopaedics, Nanfang Hospital, Southern Medical UniversityDepartment of Orthopaedics, Nanfang Hospital, Southern Medical UniversityDepartment of Orthopaedics, Nanfang Hospital, Southern Medical UniversityAbstract Background Many motion studies have shown that the inner bearing of bipolar prostheses moves less than expected under non-weight-bearing and static weight-bearing positions, which are not routine functional movements performed postoperatively. The aim of this study was to investigate the behaviours of bipolar prostheses during normal gait and simulative squatting. Methods Thirty-one femoral neck fracture patients were enrolled, and fluoroscopy examinations of walking on a treadmill, simulative squatting, and non-weight-bearing abduction-adduction and flexion-extension motions were performed at an average of 40 months postoperatively. The rate of acetabular cartilage degeneration was calculated. The ranges of motion of the outer bearing and inner bearing were determined, and the O/I ratios were calculated. Clinical efficacy was assessed by HHS and EQ-5D score. Results The inner bearing moved more than the outer bearing did, with an O/I ratio of 0.81, during the normal gait examination, while the motion of the outer bearing was obviously dominant during the simulative squatting and non-weight-bearing abduction-adduction and flexion-extension examinations. The mean acetabular cartilage degeneration rate was 0.82 ± 0.54 mm/year at the follow-up. In subgroup analyses, the motion of the outer bearing decreased to some extent with the increase in acetabular wear, and the corresponding O/I ratios among the groups showed a trend of decreasing first and then increasing. The HHS and EQ-5D scores of the patients with osteolysis and femoral stem loosening were much worse than those with fixed implants. Conclusion Bipolar prostheses do function as originally intended during gait, but movement primarily occurs at the outer bearing during other examinations. The motion patterns of bipolar prostheses change with the increase in acetabular wear.http://link.springer.com/article/10.1186/s12891-020-03749-6Bipolar hemiarthroplastyMotionInner bearingOuter bearingTreadmillOsteoarthritis |
| spellingShingle | Weizhou Jiang Jun Xiao Bin Chen Ming Jia Yang Zhang Jian Wang Zhanjun Shi Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion study BMC Musculoskeletal Disorders Bipolar hemiarthroplasty Motion Inner bearing Outer bearing Treadmill Osteoarthritis |
| title | Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion study |
| title_full | Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion study |
| title_fullStr | Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion study |
| title_full_unstemmed | Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion study |
| title_short | Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion study |
| title_sort | joint motion of bipolar hemiarthroplasty in routine hip functional movements a dynamic motion study |
| topic | Bipolar hemiarthroplasty Motion Inner bearing Outer bearing Treadmill Osteoarthritis |
| url | http://link.springer.com/article/10.1186/s12891-020-03749-6 |
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