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Hip flexor muscle fatigue in patients with symptomatic femoroacetabular impingement

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Abstract

Purpose

Patients with symptomatic femoroacetabular impingement (FAI) have considerable hip muscle weakness, in particular, hip flexion and hip adduction. In addition, they experience disabilities while performing prolonged dynamic tasks. It was therefore postulated that, besides hip flexor muscle weakness, patients with symptomatic FAI would show greater hip flexor fatigue compared with healthy controls.

Methods

Hip flexor fatigue was evaluated in two different experiments. Fifteen patients with symptomatic FAI and 15 age-matched healthy controls were tested in each experiment. In the first one, changes in hip flexor torque fluctuations and electromyographic (EMG) activity were measured during a sustained submaximal isometric contraction. In the second experiment, hip flexor torque decline was measured during a series of 20 maximal dynamic contractions.

Results

Patients with FAI exhibited hip flexor weakness under both isometric (P = 0.02) and isokinetic conditions (P = 0.03). Fatigue-induced changes in isometric hip flexor torque fluctuations, EMG root mean square and median frequency did not differ significantly between patients and controls (P > 0.05). Similarly, isokinetic hip flexor torque decline was comparable in patients with FAI and controls (P > 0.05).

Conclusions

None of the hip flexor fatigue outcomes considered here differed between patients with symptomatic FAI and controls. Therefore, the disabilities that patients experience while performing prolonged dynamic tasks do not seem to be caused by exaggerated hip flexor muscle fatigue.

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Acknowledgments

The authors would like to thank Severin Staehli for his contribution in data collection.

Conflict of interest

The authors declare that they have no conflict of interest.

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Correspondence to N. C. Casartelli.

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Casartelli, N.C., Leunig, M., Item-Glatthorn, J.F. et al. Hip flexor muscle fatigue in patients with symptomatic femoroacetabular impingement. International Orthopaedics (SICOT) 36, 967–973 (2012). https://doi.org/10.1007/s00264-011-1385-5

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  • DOI: https://doi.org/10.1007/s00264-011-1385-5

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