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Mechanical work adaptations of above-knee amputee ambulation
R E Seroussi1, A Gitter, J M Czerniecki
1Rehabilitation and Spine Center, Everett, WA, USA.
Archives of Physical Medicine and Rehabilitation
|November 1, 1996
Summary
Above-knee amputee patients exhibit significant muscular adaptations in their intact limb to compensate for prosthetic limitations during ambulation. Their intact limb performs greater work at the hip and ankle to maintain gait progression and stability.
Area of Science:
- Biomechanics
- Kinesiology
- Prosthetics
Background:
- Above-knee amputation presents challenges to normal gait mechanics.
- Understanding muscular adaptations is crucial for improving prosthetic limb function and patient mobility.
Purpose of the Study:
- To quantify muscular adaptations during ambulation in above-knee amputee patients.
- To compare the biomechanical demands on the intact limb versus normal gait.
Main Methods:
- A nonrandomized controlled study involving 8 above-knee amputees and 8 normal ambulators.
- Gait analysis and an inverse dynamics linked segment model were used to calculate joint torques, power, and work.
- Subjects walked at self-selected speeds with lightweight prostheses.
Main Results:
- The intact limb of amputees performed significantly more work at the ankle (plantarflexion) and hip (extension) compared to normal subjects.
- The prosthetic limb showed reduced work output during push-off compared to the intact limb and normal subjects.
- These findings suggest compensatory mechanisms in the intact limb to facilitate gait.
Conclusions:
- Above-knee amputees demonstrate increased joint torques and power output in their intact limb.
- These adaptations support gait progression and upright stance, compensating for the lack of active muscle support from the prosthetic limb.
- The study highlights the significant biomechanical adjustments required for ambulation with an above-knee prosthesis.