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| This study aimed at determining the influence of patellofemoral pain syndrome (PFPS) on torque peak and the work of knee flexor and extensor muscles, in addition to evaluating the pain and functionality of individuals that have this dysfunction. Fifty-two female subjects, 23 with diagnosis of PFPS, and 29 control subjects, clinically healthy and similar in age, height, and body mass participated in this study. The isokinetic evaluation was performed on concentric mode for knee flexors and extensors at speeds of 60° and 180°/s. The Visual Numerical Scale and the Kujala questionnaire were also applied before and after each speed of isokinetic testing. The data were analyzed through descriptive and inferential statistics (U Mann–Whitney, Wilcoxon, and independent t-tests) with a significance level of α=0.05. The patellofemoral pain syndrome group had lower scores (p=0.01) on the Kujala questionnaire (75.7±12.3 points) in relation to the control group (100±0.0 points), and lower peak torque of knee flexors (0.82±0.24 Nm/kg; 0.51±0.22 Nm/kg) and extensors (1.85±0.48 Nm/kg; 1.13±0.44 Nm/kg) at 60° and 180°/s as well as lower total work of knee extensors at 180°/s (6.46±2.54 Joules/kg) and 60°/s (9.42±3.27 Joules/kg). In addition, there was exacerbation of pain in the patellofemoral pain syndrome group after the isokinetic evaluation at 180°/s (0.9 cm) and 60°/s (2.3 cm). The results evidenced that individuals with PFPS have lower functional capacity, lower torque peak, and decreased function of knee flexors and extensors, which suggests that strengthening these muscles must be considered in the rehabilitation of these subjects.

Avaliação isocinética, dor e funcionalidade de sujeitos com síndrome da dor patelofemoral