Hip joint muscle forces during gait in patients with femoroacetabular impingement syndrome are associated with patient reported outcomes and cartilage composition |
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| Affiliation: | 1. La Trobe Sport and Exercise Medicine Research Centre, La Trobe University, Bundoora, Victoria, Australia;2. School of Health and Rehabilitation Sciences, University of Queensland, St Lucia, Queensland, Australia;1. Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Biomedical Imaging, University of California–San Francisco, 185 Berry Street, Suite 350, San Francisco, CA 94107, USA;2. Division of Physical Therapy, College of Health Professions, Medical University of South Carolina, 151B Rutledge Avenue, MSC 962, Room B309, Charleston, SC 29425, USA;3. Department of Physical Therapy and Rehabilitation Science, University of California–San Francisco, 1500 Owens Street, Suite 400, San Francisco, CA 94158, USA |
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| Abstract: | Femoroacetabular impingement syndrome (FAIS) consists of abnormal hip joint morphology and pain during activities of daily living. Abnormal gait mechanics and potentially abnormal muscle forces within FAI patients leads to articular cartilage damage. Therefore, there is a necessity to understand the effects of FAI on hip joint muscle forces during gait and the link between muscle forces, patient reported outcomes (PRO) and articular cartilage health. The purposes of this study were to assess: (1) hip muscle forces between FAI patients and healthy controls and (2) the associations between hip muscle forces with PRO and cartilage composition (T1ρ/T2 mapping) within FAI patients. Musculoskeletal simulations were used to estimate peak muscle forces during the stance phase of gait in 24 FAI patients and 24 healthy controls. Compared to controls, FAI patients ambulated with lower vasti (30% body-weight, p = 0.01) and higher sartorius (4.0% body-weight, p < 0.01) forces. Within FAI patients, lower peak gluteus medius, gluteus minimus, sartorius and iliopsoas forces were associated with worse hip joint pain and function (R = 0.43–0.70, p = 0–0.04), while lower muscle forces were associated with increased T1ρ and T2 values (i.e. altered cartilage composition) within the hip joint cartilage (R = −0.44 to −0.58, p = 0.006–0.05). Although FAI patients demonstrate abnormal muscle forces, it is unknown whether or not these altered muscle force patterns are associated with pain avoidance or weak musculature. Further investigation is required in order to better understand the effects of FAI on hip joint muscle forces and the associations with hip joint cartilage degeneration. |
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| Keywords: | Femoroacetabular impingement Gait OpenSim Hip joint Musculoskeletal simulation Muscle force |
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