Background: Femoroacetabular impingement (FAI) syndrome is a hip joint motion-related clinical disorder characterized by abnormal contact between the hip joint structures. Abnormal hip morphology and joint pain may impair the hip joint range of motion (ROM) and muscle function. However, FAI effects on hip joint ROM and muscle strength remain controversial. Objectives: The purpose of this study was to compare hip joint ROM and muscle strength between FAI syndrome patients and healthy controls. Methods: Twenty FAI syndrome male patients and 20 healthy male controls (CG) matched for age (FAI = 28 ± 6 years; CG = 27 ± 5 years), body mass (FAI = 81 ± 12 kg; CG = 80 ± 13 kg) and height (FAI = 177 ± 6 cm; CG = 178 ± 6 cm), participated in the study. Hip joint ROM for flexion, internal rotation and external rotation were assessed through goniometry. Maximal isometric strength for hip flexion, extension, abduction and adduction were evaluated through hand-held dynamometry. Results: Hip joint ROM was significantly lower in FAI syndrome patients compared with CG for passive flexion (−4%; effect size-ES = 0.65), active internal rotation (−42%; ES = 1.60), active external rotation (−28%; ES = 1.46) and passive external rotation (−23%; ES = 1.63). FAI patients' hip extensors (−34%; ES = 1.46), hip adductors (−33%; ES = 1.32), and hip flexors (−25%; ES = 1.17) were weaker compared to the CG subjects.

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Purpose This study aimed to determine if forward step-down task frontal kinematics differ in women with and without patellofemoral pain (PFP). Methods Cross-sectional study. A total of 32 women were allocated into a healthy control group (CG; n = 16) and to a PFP (n = 16) group. All participants performed two trials with five consecutive forward step-down task (FSD) repetitions each. A video camera, positioned 3 m from the participant's frontal plane, recorded the movement (sampling rate = 30 Hz). All recorded videos were evaluated on Image-J software, and the following outcomes were obtained: delta mean (∆mean, the difference between final and initial positions) and delta peak (∆peak) values for Q-angle (Qϴ), hip and knee frontal plane projection angles, and dynamic valgus index. We compared groups with the Student's t test for independent samples and the Mann-Whitney test. Results Groups showed similar (p > 0.05

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