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Jian-Tao Wang,Yu Zhang,Qing Liu,Qiang He,Dong-Liang Zhang,Ying Zhang,Ji-Xuan Xiao,Xin Mu,Ming Hu.[J].Chin J Traumatol,2015,18(5):259-266. [doi] |
Effect of posterior condylar offset on clinical results after posterior-stabilizedtotal knee arthroplasty |
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DOI: |
KeyWord: Arthroplasy
Replacement
Knee
Posterior stabilized
Posterior condylar offset
Knee flexion
Clinical results |
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Abstract: |
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 mm, 31 knees). One-year postoperatively,
clinical and radiographic variables from the two groups were compared by independent t-test. The associations 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 Universities 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. |
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