SICOT-J
Comparison of coronal alignment measured on postoperative short-leg and standing long-leg radiographs following total knee arthroplasty
By Schanknecht R, Willemse C, Mulunda BF and 3 others.
Abstract
Introduction
Coronal alignment following total knee arthroplasty (TKA) is commonly assessed using radiographs, but postoperative radiographic protocols are not standardised. This study evaluated agreement between coronal alignment measured on short-leg and standing long-leg radiographs. We hypothesised that, in knees demonstrating varus alignment on standing long-leg radiographs, short-leg radiographs would demonstrate greater apparent varus.
Methods
This retrospective cross-sectional study included 62 sequentially selected patients following primary TKA. All included patients had both postoperative short-leg and standing long-leg radiographic examinations available for analysis. Coronal alignment was assessed using the β angle. Agreement was evaluated using paired differences and Bland-Altman analysis. Interobserver reliability was assessed across six observers (two primary observers and four additional colleagues) using ICC(2,6). Intraobserver reliability was assessed using ICC(3,1).