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Effect of Coronal Plane Knee Alignment Classification on Clinical Outcomes After High Tibial Osteotomy
Mitsuaki Kubota1, Youngji Kim1, Haruka Kaneko1
1Department of Orthopaedics, Juntendo University, Faculty of Medicine, Tokyo, Japan.
Background:
Studies on the coronal plane alignment of the knee (CPAK) classification after high tibial osteotomy (HTO) are scarce.
Purpose:
To (1) clarify the distribution of the CPAK phenotype in patients who underwent HTO and (2) compare the clinical results according to the CPAK phenotypes.
Study Design:
Case Series; Level of evidence, 4.
Methods:
Overall, 171 knees of patients with HTO were retrospectively evaluated. The primary outcome was to investigate the serial changes in the CPAK preoperatively and 2 years postoperatively. The secondary outcome was to assess the subcategories of the knee injury and osteoarthritis outcome score (KOOS) and postoperative change of KOOS according to the CPAK.
Results:
The most common pre- and postoperative CPAK phenotype types were I (62%), II (22.8%), IV (8.8%), VI (36.7%), V (18.9%), and IX (13%). The distribution of preoperative CPAK significantly changed after HTO. KOOS subscales showed no significant differences according to the CPAK phenotypes.
Conclusion:
The most common pre- and postoperative CPAK phenotypes were I and VI. No significant differences in the KOOS subscales were observed according to CPAK phenotypes following HTO.
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