Changes in patellar baja progress until 3 months after medial open-wedge high tibial osteotomy. (21st September 2022)

• Record Type: Journal Article
• Authors: Kudo, Yuki; Maeyama, Akira; Ishimatsu, Tetsuro; Matsunaga, Taiki; Hara, Junya; Arima, Hisatomi; Yamamoto, Takuaki
• Is Part Of: Journal of orthopaedic surgery. Volume 30:Number 3(2022)
• Publication Date: 2022-09-21
• Subjects: caton–deschamps index -- medial open-wedge high tibial osteotomy -- patellar height -- patellofemoral osteoarthritis -- patellar tendon contracture -- level of evidence -- therapeutic level IV -- retrospective study; Orthopedic surgery -- Periodicals; Orthopedics; Orthopedic surgery; Periodicals; 617.3
• DOI: 10.1177/10225536221128615
• Languages: English
• ISSNs: 1022-5536

Abstract

Purpose: The purpose of this study was to evaluate sequential patellar height changes as well as the factors leading to these changes after medial open-wedge high tibial osteotomy (MOWHTO). Methods: The study cohort constituted 37 knees from 36 patients who underwent MOWHTO for varus knee. The Caton–Deschamps index (CDI) for patellar height was measured preoperatively and at 2 weeks and 3, 6, and 12 months postoperatively. The factors related to sequential changes in patellar height were evaluated. Results: Significant differences were observed between preoperative CDI and postoperative CDI at all time points ( p < .05). Two-week postoperative CDI and postoperative CDI at 3, 6, 12-months was also significantly different ( p < .05). The only significant factor for the change in patellar height between preoperative CDI and postoperative CDI at 2-weeks and 12-months was the change in the Δ medial proximal tibial angle (ΔMPTA) (postoperative MPTA–preoperative MPTA). We could not identify the factor that affected the change in patellar height change from 2-weeks postoperatively. Conclusion: The change in patellar height continued sequentially until at least 3 months postoperatively. ΔMPTA was associated with the change in patellar height at 2 weeks postoperatively compared with preoperatively; however, no factors associated with the change in patellar height from 2 weeks postoperatively to 3, 6, and 12-months postoperatively were identified.