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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KeyWord: Arthroplasy Replacement Knee Posterior stabilized Posterior condylar offset Knee flexion Clinical results
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Author NameAffiliation
Jian-Tao Wang Department of Orthopedics, Nankai University Tianjin Union Medical Center 
Yu Zhang Department of Orthopedics, Nankai University Tianjin Union Medical Center 
Qing Liu Department of Radiology, Tianjin Beichen Hospital 
Qiang He Department of Occupational Disease, Second Affiliated Hospital of Shandong University of Traditional Chinese Medicine 
Dong-Liang Zhang Department of Orthopedics, Nankai University Tianjin Union Medical Center 
Ying Zhang Department of Orthopedics, Nankai University Tianjin Union Medical Center 
Ji-Xuan Xiao Department of Orthopedics, Nankai University Tianjin Union Medical Center 
Xin Mu Department of Orthopedics, Nankai University Tianjin Union Medical Center 
Ming Hu Department of Orthopedics, Tianjin Beichen Hospital 
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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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