ArticleOrthopaedic journal of sports medicine2026
Relationship of Baseline Physical Activity and Morphologic Factors in Patients With Lateral Patellar Instability.
Article in Orthopaedic journal of sports medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Lateral patellar instability is more common in adolescents and young adults, and morphologic factors contribute to patellar dislocation. However, the relationship between baseline physical activity and morphologic risk factors in this population remains unclear. Purpose: To investigate the association between baseline physical activity and morphologic factors in patients with lateral patellar instability. Study Design: Cohort study; Level of evidence 3. Methods: A total of 111 knees of 75 patients (mean ± SD age, 20.4 ± 10.0 years) undergoing medial patellofemoral ligament reconstruction for lateral patellar instability were retrospectively analyzed. Patients were stratified into the competitive sports (n = 34), recreational sports (n = 18), and nonsports (n = 23) groups based on presymptom activity. Imaging parameters included trochlear depth (TD), Dejour classification and patellar height (Insall-Salvati ratio [ISR]) on preoperative lateral radiographs; congruence angle (CA), sulcus angle (SA), and tilt angle (TA) on Merchant view; and tibial tuberosity-trochlear groove (TT-TG) distance on preoperative computed tomography. To compare morphological parameters among the 3 groups, generalized estimating equations were used to account for within-patient clustering. Results: The nonsports group had a significantly higher mean age ( Conclusion: Many competitive athletes demonstrated greater TD but nonetheless frequently underwent bilateral surgical procedures. Similarly, nonsports participants also showed a high rate of bilateral procedures, which may reflect more severe trochlear dysplasia rather than activity-related demand alone. These findings highlight the importance of considering both baseline activity level and trochlear morphology when determining surgical indications in young patients with lateral patellar instability.
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