This study investigated isometric and isokinetic hip strength in individuals with and without symptomatic femoroacetabular impingement (FAI). The specific aims were to: (i) determine whether differences exist in isometric and isokinetic hip strength measures between groups; (ii) compare hip strength agonist/antagonist ratios between groups; and (iii) examine relationships between hip strength and self-reported measures of either hip pain or function in those with FAI.
Fifteen individuals (11 males; 25 ± 5 years) with symptomatic FAI (clinical examination and imaging (alpha angle >55° (cam FAI), and lateral centre edge angle >39° and/or positive crossover sign (combined FAI))) and 14 age- and sex-matched disease-free controls (no morphological FAI on magnetic resonance imaging) underwent strength testing. Maximal voluntary isometric contraction strength of hip muscle groups and isokinetic hip internal (IR) and external rotation (ER) strength (20°/s) were measured. Groups were compared with independent t-tests and Mann–Whitney U tests.
Participants with FAI had 20% lower isometric abduction strength than controls (p = 0.04). There were no significant differences in isometric strength for other muscle groups or peak isokinetic ER or IR strength. The ratio of isometric, but not isokinetic, ER/IR strength was significantly higher in the FAI group (p = 0.01). There were no differences in ratios for other muscle groups. Angle of peak IR torque was the only feature correlated with symptoms.
Individuals with symptomatic FAI demonstrate isometric hip abductor muscle weakness and strength imbalance in the hip rotators. Strength measurement, including agonist/antagonist ratios, may be relevant for clinical management of FAI.
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- Femoroacetabular impingement: a cause for osteoarthritis of the hip.Clin Orthop Relat Res. 2003; 417: 112-120
- Femoroacetabular impingement in 45 professional athletes: associated pathologies and return to sport following arthroscopic decompression.Knee Surg Sports Traumatol Arthrosc. 2007; 15: 908-914
- Hip arthroscopy: current indications, treatment options, and management issues.Am J Sports Med. 2003; 31: 1020-1037
- Hip muscle strength and muscle cross sectional area in men with and without hip osteoarthritis.J Rheumatol. 2002; 29: 2185-2195
- Hip muscle weakness in patients with symptomatic femoroacetabular impingement.Osteoarthr Cartilage. 2011; 19: 816-821
- Prevalence of femoroacetabular impingement imaging findings in asymptomatic volunteers: a systematic review.Arthroscopy. 2015; 31: 1199-1204
- Rehabilitation after arthroscopic decompression for femoroacetabular impingement.Clin Sports Med. 2010; 29 (viii): 247-255
- Femoroacetabular impingement.J Bone Joint Surg Am. 2013; 95: 82-92
- Nonoperative treatment for femoroacetabular impingement: a systematic review of the literature.PM R. 2013; 5: 418-426
- Femoroacetabular impingement.J Am Acad Orthop Surg. 2007; 15: 561-570
- Range of motion in femoroacetabular impingement.Acta Orthop Belg. 2012; 78: 327-332
- Kinesiology of the hip: a focus on muscular actions.J Orthop Sports Phys Ther. 2010; 40: 82-94
- “At-risk” positioning and hip biomechanics of the Peewee ice hockey sprint start.Am J Sports Med. 2011; 39 Suppl: 29S-35S
- Neuromuscular hip biomechanics and pathology in the athlete.Clin Sports Med. 2006; 25 (vii): 179-197
- Can local muscles augment stability in the hip? A narrative literature review.J Musculoskelet Neuronal Interact. 2013; 13: 1-12
- The contour of the femoral head-neck junction as a predictor for the risk of anterior impingement.J Bone Joint Surg Br. 2002; 84: 556-560
- Review: femoroacetabular impingement.Arthritis Rheumatol. 2015; 67: 17-27
- Can radiographic morphometric parameters for the hip be assessed on MRI?.Clin Orthop Relat Res. 2013; 471: 989-999
- Intrarater test-retest reliability of hip range of motion and hip muscle strength measurements in persons with hip osteoarthritis.Arch Phys Med Rehabil. 2008; 89: 1146-1154
- Clinical assessment of hip strength using a hand-held dynamometer is reliable.Scand J Med Sci Sports. 2010; 20: 493-501
- Greater understanding of normal hip physical function may guide clinicians in providing targeted rehabilitation programmes.J Sci Med Sport. 2013; 16: 292-296
- The Copenhagen Hip and Groin Outcome Score (HAGOS): development and validation according to the COSMIN checklist.Br J Sports Med. 2011; 45: 478-491
- The Development and validation of a self-administered quality-of-life outcome measure for young, active patients with symptomatic hip disease: the International Hip Outcome Tool (iHOT-33).Arthroscopy. 2012; 28 (quiz 606-510 e591): 595-605
- Rating systems in the evaluation of knee ligament injuries.Clin Orthop Relat Res. 1985; 198: 43-49
- Femoroacetabular impingement surgery: are we moving too fast and too far beyond the evidence?.Br J Sports Med. 2015; 49: 782-784
- The functional anatomy of tensor fasciae latae and gluteus medius and minimus.J Anat. 1989; 166: 179-189
- Assessment of hip and knee muscle function in orthopaedic practice and research.J Bone Joint Surg Am. 2010; 92: 220-229
- Hip flexor muscle fatigue in patients with symptomatic femoroacetabular impingement.Int Orthop. 2012; 36: 967-973
- Is hip range of motion and strength impaired in people with hip chondrolabral pathology?.J Musculoskelet Neuronal Interact. 2014; 14: 334-342
- Quantitative measurements of hip strength in different age groups.Clin Orthop Relat Res. 1989; 246: 136-145
Published online: October 13, 2015
Accepted: October 7, 2015
Received in revised form: September 18, 2015
Received: June 30, 2015
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