title: The effect of cam FAI on hip and pelvic motion during maximum squat.
abstract: Femoroacetabular impingement (FAI) causes abnormal contact at the anterosuperior aspect of the acetabulum in activities requiring a large hip range of motion (ROM). We addressed the following questions in this study: (1) Does FAI affect the motions of the hip and pelvis during a maximal depth squat? (2) Does FAI decrease maximal normalized squat depth? We measured the effect of cam FAI on the 3-D motion of the hip and pelvis during a maximal depth squat as compared with a healthy control group. Fifteen participants diagnosed with cam FAI and 11 matched control participants performed unloaded squats while 3-D motion analysis was collected. Patients with FAI had no differences in hip motion during squatting but had decreased sagittal pelvic range of motion compared to the control group (14.7 +/- 8.4 degrees versus 24.2 +/- 6.8 degrees , respectively). The FAI group also could not squat as low as the control group (41.5 +/- 12.5% versus 32.3 +/- 6.8% of leg length, respectively), indicating the maximal depth squat may be useful as a diagnostic exercise. Limited sagittal pelvic ROM in FAI patients may contribute to their decreased squatting depth, and could represent a factor amongst others in the pathomechanics of FAI.
authors.affiliation: School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada K1N 6N5. mlamon@uottawa.ca
authors.forename: Mario
authors.initials: M
authors.lastname: Lamontagne
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Kennedy
authors.forename: Paul E
authors.initials: PE
authors.lastname: Beaulé
mesh_terms: D000077:Acetabulum / Q000503:physiopathology*; D000328:Adult; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D004185:Disability Evaluation; D015444:Exercise; D005260:Female; D005269:Femur / Q000503:physiopathology*; D006621:Hip Joint / Q000503:physiopathology*; D006801:Humans; D021621:Imaging, Three-Dimensional; D007592:Joint Diseases / Q000175:diagnosis / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000503:physiopathology*; D016059:Range of Motion, Articular; D014741:Video Recording; D055815:Young Adult