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Effect of posterior condylar offset on clinical results after posterior-stabilized total knee arthroplasty

Chinese Journal of Traumatology 2015年第5期18卷 259-266页

作者： Jian-Tao Wang Yu Zhang Qing Liu Qiang He Dong-Liang Zhang Ying Zhang Ji-Xuan Xiao Xin Mu Ming Hu Department of Orthopedics Nankai University Tianjin Union Medical Center Tianjin 300121 China Department of Radiology Tianjin Beichen Hospital Tianjin 300000 China Department of Occupadonal Disease Second Affiliated Hospital of Shandong University of Traditional Chinese Medicine Jinan Shandong 250001 China Department of Orthopedics Tianjin Beichen Hospital Tianjin 300000 China

Purpose： To determine the effect of the posterior condylar offset （PCO） on clinical results after total knee arthroplasty （TKA） using a high-flex posterior-stabilized （PS） fixed-bearing prosthesis. Methods： We prospectively studied the clinical and radiographic materials of 89 consecutive female patients （89 knees）, who had undergone primary TKAs for end-stage osteoarthritis. All operations were performed by a single senior surgeon or under his supervision using the same operative technique. Based on the corrected PCO change, we divided all cases into two groups： group A （corrected PCO change _〉0 mm, 58 knees） and group B （corrected PCO change 〈0 ram, 31 knees）. One-year postoperatively, clinical and radiographic variables from the two groups were compared by independent t-test. The as- sociations between the corrected PCO changes and the improvements of clinical variables in all patients were analyzed by Pearson linear correlation. Results： One-year postoperatively, the Knee Society Scores, the Western Ontario and McMaster Uni- versities Osteoarthritis Index, non-weight-bearing active and passive range of knee flexion, flexion contracture, extensor lag, and their improvements had no statistical differences between the two groups （all p 〉 0.05）. The corrected PCO change was not significantly correlated with the improvement of any clinical variable （all p 〉 0.05）. Group A demonstrated greater flexion than group B during active weight bearing （p 〈 0.05）. Conclusions： Restoration of PCO plays an important role in the optimization of active knee flexion during weight-bearing conditions after posterior-stabilized TKA, while it has no benefit to non-weight-bearing knee flexion or any other clinical result.

关键词： Arthroplasy Replacement Knee posterior stabilized posterior condylar offset Knee flexion Clinical results

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