201. The advantage of navigation for knee with lateral femoral bowing in total knee arthroplasty
- Author
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Dae-Won Kang, Won-Kee Choi, Suk-Kyoon Song, Jun Ho Nam, and Myung-Rae Cho
- Subjects
Male ,musculoskeletal diseases ,Orthodontics ,Knee Joint ,business.industry ,Total knee arthroplasty ,Osteoarthritis, Knee ,lcsh:RD701-811 ,Surgery, Computer-Assisted ,lcsh:Orthopedic surgery ,Coronal plane ,Humans ,Medicine ,Female ,Surgery ,Femur ,Postoperative Period ,Lateral femoral bowing ,Arthroplasty, Replacement, Knee ,Tomography, X-Ray Computed ,business ,Aged ,Retrospective Studies - Abstract
Purpose: We have analyzed the surgical outcomes of primary total knee arthroplasty (TKA) using computer-assisted (CA) navigation in terms of postoperative coronal alignment depending on preoperative lateral femoral bowing. Methods: We conducted a retrospective study of patients who have undergone navigated primary TKA from January 2016 through January 2020. Two hundred and ninety-nine cases with lateral femoral bowing of 3° or less were assigned to group 1, 95 cases of lateral femoral bowing between 3° and 5° were assigned to group 2, and 89 cases with lateral femoral bowing of more than 5° were assigned to group 3. The postoperative mechanical hip–knee–ankle (mHKA) angle was measured from scanograms, which were taken 3 months after surgery. The appropriate range of coronal alignment was set as 0 ± 3°. Results: The number of outliers of mHKA occurred was 31 cases (10.4%) in group 1, 17 cases (17.9%) in group 2, and 17 cases (19.1%) in group 3. There was a significant correlation between the degree of lateral femoral bowing and the occurrence rate of mHKA outliers. Multiple variables logistic regression analysis showed occurrence rate of outliers in group 3 to be 2.04 times higher than group 1. After adjusting the patient’s age, sex, body mass index, and preoperative HKA deformity, the occurrence rate of outliers in group 3 was still 1.96 times higher than group 1. Conclusion: The benefit of CA navigation during TKA in obtaining coronal alignment within 0 ± 3° may be lessened when the preoperative lateral femoral bowing is severely advanced.
- Published
- 2020