Abstract
Introduction
This study evaluated the correlation between postoperative knee joint line obliquity after medial open-wedge high tibial osteotomy and patient-reported outcome measures excluding excessively overcorrected knees. This study further identified preoperative radiological factors related to the increased postoperative knee joint line obliquity.
Materials and methods
We retrospectively evaluated patients who underwent medial open-wedge high tibial osteotomy between March 2013 and March 2021. Postoperative excessively overcorrected knees with hip-knee-ankle angle > 7° were excluded. We investigated radiological parameters and patient-reported outcome measures preoperatively and at the last follow-up. The following radiologic parameters were measured: hip-knee-ankle angle, weight-bearing line ratio, mechanical medial proximal tibial angle, mechanical lateral distal femoral angle, lateral distal tibial angle, joint line convergent angle, knee joint line obliquity, ankle joint line obliquity, hip abduction angle, tibial posterior slope, Carton-Deschamps index, and patella tilting angle. Clinical outcomes were evaluated using Japanese knee outcome measures. This assessment criterion is based on the Western Ontario McMaster Universities Arthritis Index and MOS Short Form 36. Multiple regression analysis was performed to evaluate the association between postoperative knee joint line obliquity and patient-reported outcome measures or preoperative radiological factors (P < .05).
Results
A total of 52 knees were included. The mean age at the time of the surgery was 61.6 ± 9.0 years and the mean follow-up period was 30.6 ± 10.1 months. Increased postoperative knee joint line obliquity was associated with lower Japanese knee outcome measures. The preoperative hip-knee-ankle angle was significantly associated with postoperative knee joint line obliquity.
Conclusions
Increased knee joint line obliquity after medial open-wedge high tibial osteotomy is associated with inferior clinical outcomes. Care should be given to the center of the rotational angulation in around-knee osteotomy to avoid postoperative increased knee joint line obliquity.
Level of evidence
Retrospective comparative study, Level III.
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Data availability
Due to the nature of this research, participants of this study did not agree for their data to be shared publicly, so supporting data is not available.
Abbreviations
- AJLO:
-
Ankle joint line obliquity
- CDI:
-
Carton-Deschamps index
- CORA:
-
Center of the rotational angulation
- DFO:
-
Distal femoral osteotomy
- HAA:
-
Hip abduction angle
- HKA:
-
Hip-knee-ankle
- JLCA:
-
Joint line convergent angle
- LDTA:
-
Lateral distal tibial angle
- MOWHTO:
-
Medial open-wedge high tibial osteotomy
- mLDFA:
-
Mechanical lateral distal femoral angle
- mMPTA:
-
Mechanical medial proximal tibial angle
- OA:
-
Osteoarthritis
- PROMs:
-
Patient-reported outcome measures
- PT:
-
Patella tilting angle
- TPS:
-
Tibial posterior slope
- WBLR:
-
Weight-bearing line ratio
- WOMAC:
-
Western Ontario McMaster Universities Arthritis Index
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KH and SO study design. KH collected the data, interpreted the data, and wrote the paper. KH data collection. All authors provided critical feedback and helped to shape the manuscript.
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Horita, K., Okimura, S., Hamaoka, K. et al. Relationship between increased knee joint line obliquity after medial open-wedge high tibial osteotomy and patient-reported outcome measures. Arch Orthop Trauma Surg 144, 1751–1762 (2024). https://doi.org/10.1007/s00402-024-05203-x
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DOI: https://doi.org/10.1007/s00402-024-05203-x