Hip flexor muscle size,strength and recruitment pattern in patients with acetabular labral tears compared to healthy controls |
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| Affiliation: | 1. School of Physiotherapy, Faculty of Health Sciences, Australian Catholic University, PO Box 456, Brisbane, Virginia, QLD 4014, Australia;2. The University of Queensland, School of Information Technology and Electrical Engineering, Brisbane, Australia;3. Brisbane Orthopaedic & Sports Medicine Centre, Brisbane, Australia;1. Dept of Clinical Therapies, University of Limerick, Limerick, Ireland;2. Academic Unit of Diagnostic Imaging, School of Healthcare, University of Leeds, Leeds, UK;3. Dept of Radiology, University Hospital Limerick, Limerick, Ireland;1. Research Unit in Osteopathy, Faculty of Motor Sciences, Université Libre de Bruxelles (ULB), Brussels, Belgium;2. Laboratory of Functional Anatomy, Faculty of Motor Sciences, Université Libre de Bruxelles (ULB), Brussels, Belgium;3. Laboratory of Anatomy, Biomechanics and Organogenesis (LABO), Faculty of Medicine, Université Libre de Bruxelles (ULB), Brussels, Belgium;1. Department of Physiotherapy, Józef Rusiecki University College, Bydgoska 33, 10-243 Olsztyn, Poland;2. Rehasport Clinic, Poznań, Poland;3. Department of Pediatric Orthopedics and Traumatology, University of Medical Sciences in Poznań, Poland;1. Department of Physical Therapy, Tzu Hui Institute of Technology, Nanchou Hsian, Ping Tung, Taiwan;2. Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan;3. Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan;4. Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan;1. Department of Physical Therapy, NAMBU University, Gwangju, South Korea;2. Department of Physical Therapy, YONSEI University, Wonju, South Korea;3. Department of Physical Therapy, DAEGU University, Daegu, South Korea;4. Department of Physical Therapy, College of Biomedical Science and Engineering, INJE University, 607 Obang-dong, Gimhae-si, Gyeongsangnam-do 621-749, South Korea |
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| Abstract: | ![]()
Acetabular labral tears are a source of hip pain and are considered to be a precursor to hip osteoarthritis. Hip flexor muscles contribute to hip joint stability and function but it is unknown if their size and function is altered in the presence of labral pathology. This study aimed to investigate hip flexor muscle size, strength and recruitment pattern in patients with hip labral pathology compared to control subjects. 12 subjects diagnosed with an unilateral acetabular labral tear were compared to 12 control subjects matched for age and gender. All subjects underwent magnetic resonance imaging (MRI) of their lumbo-pelvic region. Average muscle cross-sectional area (CSA) of the iliacus, psoas, iliopsoas, sartorius, tensor fascia latae and rectus femoris muscles were measured. Hip flexion strength was measured by an externally fixed dynamometer. Individual muscle recruitment pattern during a resisted hip flexion exercise task was measured by muscle functional MRI.Hip flexor muscle strength was found to be decreased in patients with labral pathology compared to control subjects (p < 0.01). No difference between groups or sides was found for hip flexor muscle size (all p > 0.17) and recruitment pattern (all p > 0.53).Decreased hip flexor muscle strength may affect physical function in patients with hip labral pathology by contributing to altered gait patterns and functional tasks. Clinical rehabilitation of these patients may need to include strengthening exercises for the hip flexor muscles. |
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| Keywords: | Hip injuries Osteoarthritis Muscle strength Magnetic resonance imaging |
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