Authors
Alexandre Ferreira, Christophe Jacquet, Sylvain Guy, Raghbir Khakha, Kristian Kley, Jean-Noël Argenson & Matthieu Ollivier
Keywords
Distal femoral osteotomy, Knee, Miniaci, Osteoarthritis, Planning
Orthopaedics & Traumatology: Surgery & Research
Abstract
Purposes: The purpose of this study was to validate the reversed Miniaci method for distal femoral osteotomies and to compare the accuracy with Dugdale and Paley methods.
Methods: Between January 2019 and October 2021, 59 DFO were performed in a single center. Following application of the eligibility and exclusion criteria, radiographic measurements and analysis was performed for 24 patients by two independent observers, then repeated after one month. Medical planning software: PeekMed v2.3.7.6® was used. For all patients the following measurements were performed: Hip-Knee-Ankle (HKA), mechanical lateral distal femoral angle (mLDFA), medial proximal tibial angle (MPTA), joint line convergence angle (JLCA), joint line obliquity (JLO), width of the proximal tibia and the weight-bearing line (WBL). Each image was then analysed using the following planning methods for realignment surgery: Reversed Miniaci, Dugdale and Paley. Measurements were recorded post deformity correction. Difference between target and post correction WBL was evaluated. This difference was adjusted by the objective in order to limit biases related to the different objectives according to the method.
Results: 18 patients were managed for a varus osteotomy and 6 for a valgus osteotomy. Pre-operative data was, HKA at 176.7 ± 6.3, mLDFA at 90.6 ± 5.4, MPTA 88.9 ± 1.1, a WBL for valgus 80.9% ± 9.1 and for varus deformity 23.5% ± 11.7. Inter- and intra-rater reliability was >0.8 for every method. After normalizing reported precision on the amount of correction expected, reversed Miniaci method was the most accurate with a mean deviation from the target of 3%, compared to the Dugdale's method with 9% (p< 0.001) and to Paley's method with 8.6% (p<0.001).
Conclusion: The reversed Miniaci method is effective and reliable for planning distal femoral osteotomies. Compared to other planning methods, it is the most accurate approach for achieving a correction goal.
Level of evidence: IV; Retrospective cohort study.
