Clinical Orthopaedics and Related Research

, Volume 467, Issue 3, pp 645–650 | Cite as

The Effect of Cam FAI on Hip and Pelvic Motion during Maximum Squat

  • Mario Lamontagne
  • Matthew J. Kennedy
  • Paul E. Beaulé
Symposium: Femoroacetabular Impingement: Current Status of Diagnosis and Treatment

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° versus 24.2 ± 6.8°, 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.

Level of Evidence: Level III, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

Notes

Acknowledgment

We thank Anna Fazekas Conway, research assistant of the adult reconstruction division of the orthopedic surgery department at the Ottawa Hospital.

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Copyright information

© The Association of Bone and Joint Surgeons 2008

Authors and Affiliations

  • Mario Lamontagne
    • 1
    • 2
  • Matthew J. Kennedy
    • 1
  • Paul E. Beaulé
    • 3
  1. 1.School of Human KineticsUniversity of OttawaOttawaCanada
  2. 2.Department of Mechanical EngineeringUniversity of OttawaOttawaCanada
  3. 3.Division of Orthopaedic SurgeryUniversity of OttawaOttawaCanada

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