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Gait Posture. 2016 Mar;45:187-92. doi: 10.1016/j.gaitpost.2016.01.028. Epub 2016 Feb 6.

Unilateral hip osteoarthritis: Its effects on preoperative lower limb muscle activation and intramuscular coordination patterns.

Author information

1
Experimental Orthopedics & Trauma Surgery, Frankfurt Initiative for Regenerative Medicine, Johann Wolfgang Goethe University Frankfurt, Marienburgstraße 2, 60528 Frankfurt/Main, Germany; Orthopedic University Hospital Friedrichsheim gGmbH, Marienburgstraße 2, 60528 Frankfurt/Main, Germany. Electronic address: andre.schmidt-jena@gmx.de.
2
Orthopedic University Hospital Friedrichsheim gGmbH, Marienburgstraße 2, 60528 Frankfurt/Main, Germany.
3
Department of Sports Medicine, Johann Wolfgang Goethe University Frankfurt, Ginnheimer Landstraße 39, 60487 Frankfurt/Main, Germany.
4
Frankfurt University of Applied Sciences, Nibelungenplatz 1, 60318 Frankfurt/Main, Germany.
5
Experimental Orthopedics & Trauma Surgery, Frankfurt Initiative for Regenerative Medicine, Johann Wolfgang Goethe University Frankfurt, Marienburgstraße 2, 60528 Frankfurt/Main, Germany.

Abstract

The objective of this study was to test if patients with unilateral hip osteoarthritis (OA) show greater muscle activity asymmetry between their affected and non-affected limbs than healthy controls between their left and right limbs. Seventeen patients with unilateral hip OA (7 females, 10 males) and 17 age-matched healthy controls (7 females, 10 males) participated in this study. Both groups performed instrumented gait analysis at comparable speeds. Muscle activity was recorded simultaneously for the tibialis anterior (TA), gastrocnemius medialis (GM), vastus lateralis (VL), semitendinosus (ST), tensor fasciae latae (TFL), and gluteus medius (GLM) muscles. In hip OA patients, EMG data showed greater activity of the TA muscle in the non-affected limb, and greater TFL muscle activity in the affected limb. Compared to healthy controls, greater asymmetries between paired limbs were observed for the TA and GM muscles. Finally, the TFL muscle of the affected limb contributed more to the total limb muscle activity than did the non-affected limb. The observed alterations in TA and GM muscle activity in hip OA patients may be due to the greater peak braking and peak vertical forces measured in the non-affected limb. Contrary to this, greater TLF muscle activity of the affected limb indicates the demands put on stabilizing the hip during stance phase. Further studies are necessary to test whether leg length discrepancy affects muscle activation alterations between the affected and non-affected limb in unilateral hip OA patients.

KEYWORDS:

Asymmetry index; Electromyography; Gait analysis; Ground reaction force

PMID:
26979904
DOI:
10.1016/j.gaitpost.2016.01.028
[Indexed for MEDLINE]

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