Effect of posterior condylar offset on clinical results after posterior-stabilized total knee arthroplasty.
- Author:
Jian-Tao WANG
1
;
Yu ZHANG
;
Qing LIU
;
Qiang HE
;
Dong-Liang ZHANG
;
Ying ZHANG
;
Ji-Xuan XIAO
;
Xin MU
;
Ming HU
Author Information
- Publication Type:Journal Article
- MeSH: Aged; Arthroplasty, Replacement, Knee; methods; Biomechanical Phenomena; Female; Humans; Knee Joint; physiopathology; Knee Prosthesis; Middle Aged; Osteoarthritis; physiopathology; surgery; Prospective Studies; Range of Motion, Articular
- From: Chinese Journal of Traumatology 2015;18(5):259-266
- CountryChina
- Language:English
-
Abstract:
PURPOSETo 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.
METHODSWe 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.
RESULTSOne-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).
CONCLUSIONSRestoration 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.