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Trunk Muscle Characteristics: Differences Between Sedentary Adults With and Without Unilateral Lower Limb Amputation
Jaclyn M Sions1, Emma H Beisheim1, Mark A Hoggarth2
1Department of Physical Therapy, Delaware Limb Loss Studies, University of Delaware, Newark, DE.
Archives of Physical Medicine and Rehabilitation
|March 8, 2021
Summary
Adults with lower limb amputation (LLA) show impaired trunk muscle activity and increased intramuscular fat. These trunk muscle deficits, particularly in multifidi and erector spinae, may be modifiable targets for rehabilitation interventions.
Area of Science:
- Biomedical Engineering
- Rehabilitation Science
- Musculoskeletal Imaging
Background:
- Unilateral lower limb amputation (LLA) can lead to compensatory trunk muscle adaptations.
- Understanding trunk muscle characteristics is crucial for optimizing rehabilitation and functional recovery in individuals with LLA.
Purpose of the Study:
- To compare trunk muscle activity, volume, and intramuscular fat in adults with and without LLA.
- To identify potential modifiable trunk muscle deficits in individuals with transfemoral or transtibial amputation.
Main Methods:
- A cross-sectional study involving sedentary adults with LLA (transfemoral and transtibial) and controls without LLA.
- Ultrasonography (US) assessed multifidi muscle activity.
- Magnetic resonance imaging (MRI) quantified multifidi and erector spinae muscle volume and intramuscular fat percentage.
Main Results:
- Participants with LLA exhibited reduced sound-side multifidi activity.
- Transfemoral LLA was associated with larger amputated-side multifidi volume.
- Transtibial LLA showed increased intramuscular fat in both sound- and amputated-side erector spinae muscles.
Conclusions:
- Individuals with LLA present with trunk muscle impairments, including altered activity and increased intramuscular fat.
- These findings suggest that trunk muscle deficits are modifiable and could be targeted in rehabilitation programs for individuals with LLA.
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