Feasibility of the prediction of the femoral posterior condylar angle through the proximal tibia varus angle in patients with isolated medial compartment osteoarthritis
Liu Ning, Chi Fangzhou, Liu Ziwen, Wang Jiankai, Wang Wenbo
Department of Orthopaedics, the First Affiliated Hospital of Harbin Medical University, Harbin 150001, China
Abstract：Objective This study aims to investigate the feasibility of measuring the proximal tibia varus angle (PTA) to predict the femoral posterior condylar angle (PCA) in patients with isolated medial compartment osteoarthritis.Methods A retrospective study included the clinical data of 72 patients with medial compartment knee osteoarthritis and undergoing total knee arthroplasty(7 males and 65 females, age=49-80 [66.5±14.35] years, height=155-180[164.3±11.23] cm) in the First Affiliated Hospital of Harbin Medical University from January 2018 to December 2019. All 72 patients had varus deformity in the affected side, and the varus angle was 10.6°±1.36°. The data of the full-length X-ray films of the lower limb and the CT scan of both knees were collected before operation. The PTA and the PCA of bilateral knee joints were measured on coronal X-ray films and coronal CT images. The differences in the PTA and the PCA between the affected and the healthy sides were compared. The Pearson correlation analysis was used to analyze the correlation between the PTA and the PCA of the affected and the healthy sides.Results In 72 patients, the values of the PTA and the PCA were 3.23°±0.79° and 4.64°±1.13°, respectively, in the healthy side and 8.39°±1.99° and 4.71°±1.15°, respectively, in the affected side. The PTA of the healthy side was significantly smaller than that of the affected side (t=18.916, P＜0.01). No significant difference was observed in the PCA of the healthy and the affected sides (P>0.05). The Pearson correlation analysis showed no correlation between the PTA and the PCA (rhealthy side=0.144, raffected side=0.109, all P values>0.05).Conclusions For patients with medial compartment knee osteoarthritis, no significant difference was observed in the PCA of the healthy and the affected sides, but the PTA value increased with increased degree of medial compartment wear. However, no clear correlation was observed between the PCA and the PTA. Preoperative measurement of PTA used to predict PCA is not feasible.
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Liu Ning, Chi Fangzhou, Liu Ziwen, Wang Jiankai, Wang Wenbo. Feasibility of the prediction of the femoral posterior condylar angle through the proximal tibia varus angle in patients with isolated medial compartment osteoarthritis. Chinese Journal of Anatomy and Clinics, 2021, 26(1): 73-77.
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2021, Vol. 26 
