ArticleKnee surgery, sports traumatology, arthroscopy : official journal of the ESSKA2025
Increased prevalence and severity of femoral bone wear in Japanese patients with varus knee osteoarthritis.
Article in Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Increased prevalence and severity of femoral bone wear in Japanese patients with varus knee osteoarthritis.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2025Article
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7 authors.
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Abstract
purposeThe calliper technique in kinematic alignment total knee arthroplasty assumes nearly identical medial and lateral femoral condylar radii and negligible subchondral bone wear. However, racial differences were not considered. This study aimed to assess the degree and severity of bone wear in Japanese patients with varus knee osteoarthritis.
methodsThis cross-sectional study included 155 knees from 130 patients who underwent total or unicompartmental knee arthroplasty for primary varus-type knee osteoarthritis between April 2020 and March 2024. Preoperative computed tomography scans were used to measure the femoral condylar radii via a circle-fitting technique. Bone wear was assessed at 0° and 90° by measuring the distance between the best-fit circle and the subchondral bone periphery, with additional measurements at the peak wear angle, if present.
resultsAmong 155 knees, 16 (10.3%) exhibited bone wear. Bone wear >1 mm at 0° was observed in 3.2% of the cases. The peak wear angle was 43.1 ± 5.0°, with a mean depth of 2.0 ± 0.7 mm. The medial and lateral condylar radii were nearly identical (18.3 ± 1.2 mm vs. 18.2 ± 1.2 mm, p = 0.002), with a strong correlation (R
conclusionBone wear exceeding 1 mm at 0° was observed in 3.2% of cases, while overall bone wear was present in 10.3% of knees. Although the difference in radii between the medial and lateral femoral condyles was statistically significant, it was clinically negligible. This finding supports the reliability of the cylindrical axis as a reference for surgical techniques. These results highlight the importance of recognizing potential racial differences in bone wear and underscore the need for accurate assessment to achieve anatomic restoration in kinematic alignment total knee arthroplasty. LEVEL OF EVIDENCE: Level III.
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