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Functional results of cruciate-retaining total knee arthroplasty using inside-out soft-tissue balancing in the valgus knee

Background:The purpose of this study was to test the hypothesis that treatment of arthritic deformities with a cruciate-retaining total knee arthroplasty results in sufficiently improved patient function. Methods:The preoperative angle of valgus knees in our patients ranged from 5–25° (mean=10.4°). Of 83 patients, 25 had less than 10° valgus, 33 had less than 15°, and 25 had 15° or more valgus. Results:Our results revealed a significant increase of the Short Form-12 (SF-12) and Western Ontario and McMaster Universities Arthritis Index (WOMAC) scores 3 months, 1 year, and 2 years after surgery for all patients. The range of motion also was significantly increased throughout the first postoperative year for all the patients. Conclusions:This series of cruciate-retaining total knee arthroplasty showed excellent results in patients with valgus knees presenting with an angle of 15° or less, similar to prior posterior stabilized series. Patients presenting with a larger deformity had improved results, but gains were more modest in this cohort.