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Changes in patellar baja progress until 3 months after medial open-wedge high tibial osteotomy
Yuki Kudo1, Akira Maeyama1, Tetsuro Ishimatsu1
1Department of Orthopaedic Surgery, Faculty of Medicine, 38068Fukuoka University, Japan.
Insights
Patellar height changes after medial open-wedge high tibial osteotomy (MOWHTO) were evaluated. The medial proximal tibial angle change influenced early patellar height, but factors for later changes remain unclear.
Area of Science:
- Orthopedic surgery
- Biomechanics
- Knee joint research
Background:
- Medial open-wedge high tibial osteotomy (MOWHTO) is a common procedure for varus knee osteoarthritis.
- Understanding patellar height changes post-MOWHTO is crucial for optimizing surgical outcomes.
- Sequential evaluation of patellar height and influencing factors is needed.
Purpose of the Study:
- To assess sequential changes in patellar height following MOWHTO.
- To identify factors contributing to these patellar height alterations.
- To analyze the relationship between MOWHTO and patellar biomechanics.
Main Methods:
- A cohort of 37 knees from 36 patients undergoing MOWHTO for varus knee was studied.
- Caton-Deschamps index (CDI) measured patellar height preoperatively and at 2 weeks, 3, 6, and 12 months postoperatively.
- Correlation analysis investigated factors associated with patellar height changes, including Δ medial proximal tibial angle (ΔMPTA).
Main Results:
- Significant differences in CDI were found between preoperative and all postoperative time points (p < .05).
- The change in ΔMPTA correlated significantly with patellar height changes at 2 weeks and 12 months postoperatively.
- No specific factors were identified to explain patellar height changes from 2 weeks onwards.
Conclusions:
- Patellar height undergoes sequential changes for at least 3 months after MOWHTO.
- ΔMPTA is a significant factor influencing early postoperative patellar height.
- Further research is required to elucidate factors affecting long-term patellar height changes post-MOWHTO.
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.
