[Evaluation of early efficacy of computer-assisted production of patient specific instrumentation osteotomy plate in unicompartmental knee arthroplasty].

Objective: To evaluate the early efficacy of computer-assisted production of patient specific instrumentation(PSI) osteotomy plate in unicompartmental knee arthroplasty.

Methods: A retrospective analysis was conducted on 22 patients with knee osteoarthritis who underwent unicompartmental knee arthroplasty using computer-assisted production of PSI osteotomy plate between January 2022 and November 2022. The study included 1 male and 21 females, ranged from 59.8 to 76.5 years old with an average of (68.1±6.3) years old. Surgical time, intraoperative blood loss, incision length, spacer thickness, postoperative complications, postoperative femoral component varus and valgus angle (FVVA), femoral component flexion and extension angle (FFEA), tibial component varus and valgus angle (TVVA), tibial component posterior slope angle (TPSA), hip-knee-ankle mechanical angle (HKAA), and preoperative and postoperative 1-month, 3-month Hospital for Special Surgery knee-rating (HSS) and American Knee Society Score (KSS) were measured.

Results: The surgical time was (65.18±6.05) minutes, blood loss was (9.32±5.44) g·L^-1, incision length was (10.34±0.84) cm, and spacer thickness was (3.55±0.86) mm. The FVVA was (1.20±3.69)°, FFEA was (8.17±2.13)°, TVVA was (2.86±1.86)°, TPSA was (2.89±1.18)°, and HKAA was (183.15±1.46)°. The preoperative HSS score was (64.00±2.78) points, and KSS score was (Knee:59.09±6.16;Function:47.13±5.01). The postoperative 1-month HSS score was (74.91±3.57) points, and KSS score was (Knee:73.91±4.72;Function:65.46±6.38). The postoperative 3-month HSS score was (85.00±3.25) points, and KSS score was (Knee:83.00±2.88;Function:76.73±5.10). The comparison of preoperative and postoperative 1-month and 3-month HSS and KSS scores showed a statistically significant difference(P<0.05).

Conclusion: The early clinical efficacy of computer-assisted production of PSI osteotomy plate in unicompartmental knee arthroplasty for the treatment of knee osteoarthritis is satisfactory. This technique can simplify surgical procedures, improve the accuracy of osteotomy and implant placement, and help shorten the learning curve.