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  • Title: Outcomes of cruciate-retaining total knee arthroplasty for osteoarthritis with severe varus deformity.
    Author: Noh JH, Song KI, Heo YS.
    Journal: Eur J Orthop Surg Traumatol; 2023 Aug; 33(6):2465-2472. PubMed ID: 36536108.
    Abstract:
    BACKGROUND: Varus deformity is common in osteoarthritic knee. The purpose of this study was to investigate the clinical and radiographic outcomes after cruciate-retaining (CR) total knee arthroplasty (TKA) for severely varus osteoarthritic knees and compare them to those of mildly to moderately deformed osteoarthritic knees. METHODS: Eight hundred ninety-four subjects were undergone CR TKA, 137 had severe varus deformity (group 1), and 757 had mild-to-moderate deformity (group 2) of the lower limb preoperatively. Pre- and postoperative outcomes were compared between two groups clinically and radiographically. RESULTS: Mean follow-up period was 54.7 ± 28.9 months. Mean age was 77.8 ± 6.7 years in group 1 and 74.5 ± 7.4 years in group 2 (p < 0.001). Preoperative hip-knee-ankle angle (HKAA) was - 17.7°±2.9° in group 1 and - 6.3° ± 5.1° in group 2 (p < 0.001). Preoperative range of motion (ROM) was 127.7° ± 15.2° in group 1 and 130.8 °± 9.6° in group 2 (p = 0.019). Preoperative Knee Society scores and WOMAC score were not significantly different between two groups. Postoperative HKAA was - 0.4° ± 2.3° in group 1 and 0.6 ° ± 2.0° in group 2 (p < 0.001). Postoperative ROM, Knee Society scores, and WOMAC score were not significantly different between two groups. CONCLUSIONS: CR TKA showed results in subjects with severe varus deformities comparable to those without severe varus deformities. Whether the degree of preoperative varus deformity of the lower limb should be considered when deciding to perform CR-type or PS-type TKA requires further discussion. LEVEL OF EVIDENCE: Retrospective comparative study, Level III.
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