Comparison of Bicompartmental Knee Arthroplasty and Bicruciate-Retaining Total Knee Arthroplasty With Midterm Clinical Outcomes.

To compare the clinical outcomes of bicompartmental knee arthroplasty (BKA) combined with patellofemoral arthroplasty and medial unicompartmental knee arthroplasty with bicruciate-retaining total knee arthroplasty (BCR-TKA) at a mean postoperative period of five years. A retrospective comparative study was conducted, including 16 knees in the BKA group and 39 knees in the BCR-TKA group. Demographic data and clinical outcomes, such as the 2011 Knee Society Score (2011 KSS), Forgotten Joint Score-12 (FJS-12), and knee range of motion (knee ROM), were collected and compared between the two groups. The mean follow-up period was six years for the BKA group and five years for the BCR-TKA group. Preoperative evaluations, including the 2011 KSS (except for patient expectations) and knee ROM, showed no significant differences between the groups. At the final follow-up, no statistically significant differences were observed in the 2011 KSS or FJS-12. However, knee ROM was significantly greater in the BKA group (141.9° ± 6.0° vs. 130.0° ± 10.7° for BCR-TKA, p < 0.05). No revisions were required in the BKA group, while one knee (2.6%) in the BCR-TKA group underwent revision surgery due to persistent pain. BKA demonstrated comparable patient-reported outcome measures to BCR-TKA and provided significantly greater knee ROM. BKA may be a viable treatment option for knees with degeneration and symptoms limited to the medial compartment and the patellofemoral joint.