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BACKGROUND: The aim of this study is to compare the prevalence of joint hypermobility between patients with patellar recurrent dislocation and those without.METHODS: In total, 287 participants were included in the study. The participants were divided into study and control groups. The former comprised 74 patients with a prior diagnosis of recurrent patellar dislocation (mean age 17.7±3.6 years, range 12-26). The control group comprised 213 patients (mean age 15.7±2.6 years, range 12-21) with no joint injury in their medical history. The patients were examined according to the Beighton Scale as part of a routine clinical assessment during admission to the clinic before surgery or during regular visits.RESULTS: The group with recurrent patellar dislocation demonstrated significantly higher mean Beighton scores (3.12 points) than the control group (2.07 points; P<0.001). Among the female participants, the study group had a significantly higher mean score (3.59 points) than control group (2.61 points; P=0.005). A similar result was obtained for the male participants, with mean scores of 2.58 points in the study group and 1.77 points in the control (P=0.011). A higher percentage of joint laxity cases (Beighton Score ≥4) were found in the study group (41.9%) than in the control group (21.6%) (P<0.001).CONCLUSIONS: Joint hypermobility is more common in patients with patellar instability. Women are more prone to ligamentous laxity, even among the healthy population. The positive correlation between laxity and patellar instability is much more evident in men than women.
Małecki et al. (Sat,) studied this question.