Summary

The clinical curative effect and logistic regression analysis of bone anchor assisted knee extensor mechanism reconstruction for patellofemoral instability

Abstract

Purpose

To explore the clinical curative effect of bone anchor assisted knee extensor mechanism reconstruction and to analyze the relative factors of the results by logistic regression method. Materials and Methods: This reconstruction was performed in 83 patients (2012.01-2015.12). There were 54 male and 29 female patients (range, 13 to 53 year-old, 24 years old in average) who suffered an average disease course of 9 years (range, 1 to 13 years). Patients were evaluated clinically with use of the Lysholm and Kujula knee scores and Insall criterion. Results: The postoperative follow-up time ranged from 12 to 48 months (28 months in average). At the 1 year follow-up, all patients had a significant improvement on the Lysholm (69.33 ± 8.38 preoperatively and 88.65 ± 12.93 postoperatively) and Kujula (69.33 ± 8.38 preoperatively and 88.65 ± 12.93 postoperatively) knee scores (P < 0.05). According to the Insall Criterion Evaluation, the results were Excellent in 56 cases, Good in 10 cases and Normal in 9 cases, with an “Excellent” and “Good” ratio of 79.5%. Conclusions: Results from logistic regression analysis indicated that this reconstruction had a better effect on the adolescents. Patella alta and flat lateral femoral condyle have no influence on it.