A pre-operative grade 3 J-sign adversely affects short-term clinical outcome and is more likely to yield MPFL residual graft laxity in recurrent patellar dislocation

摘要: The purposes of this study were to investigate the anatomical risk factors grade 3 J-sign and analyse influence J-sign grades on short-term clinical outcomes patients with recurrent patellar dislocation. From 2016 2018, a total 168 dislocation (187 knees) underwent medial patellofemoral ligament reconstruction or without tibial tuberosity medialization. Pre-operative severity was graded according previously described classification (grades 1–3). Potential explored. Comparisons assessed between different using univariate binary logistic regression analyses. Kujala score compared pre-operative values, stress fluoroscopy performed assess residual graft laxity. Among 130 included cases, 104 knees at least 1-year follow-up in outcome analyses explore several outcomes. A 118 (130 present study. median age surgery 21 years (range 13–38), 111 affected belonged female (85%). Univariate multivariate regressions 3 group 1–2 groups showed that increased femoral anteversion, excessive external torsion, patella alta three independent improved from 54 (range, 38–72) pre-operatively 86 70–100) post-operatively. Although no re-dislocation reported during follow-up, 6 out 32 demonstrated “MPFL laxity” based post-operative radiography (18.8%), which significantly higher than (0%, p < 0.001). Subgroup analysis had lower scores those 1–2 J-sign (p < 0.001). Moreover, anteversion (≥ 30°) correlated an inferior (p = 0.023). anatomic alta. more treated MPFL medialization minimum follow-up. III