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Double-limb support and step-length asymmetry in below-knee amputees
E Isakov1, H Burger, J Krajnik
1Orthopaedic Rehabilitation Department, Loewenstein Rehabilitation Hospital, Tel-Aviv University School of Medicine, Ra'anana, Israel.
Scandinavian Journal of Rehabilitation Medicine
|June 1, 1997
Summary
Below-knee amputees exhibit abnormal gait patterns, particularly in double-limb support timing and step length symmetry. Prosthetic ankle-foot limitations contribute to these kinematic differences during walking.
Area of Science:
- Biomechanics
- Kinesiology
- Prosthetics
Background:
- Gait in below-knee amputees is characterized by compromised kinematic parameters and event sequencing.
- Symmetry between lower limbs is often impaired following amputation.
Purpose of the Study:
- To investigate the periods of double-limb support and step length in individuals with below-knee amputations.
- To quantify gait asymmetries in temporal and distance parameters.
Main Methods:
- Analysis of gait events and kinematic parameters in below-knee amputees.
- Measurement of double-limb support duration and step length for both limbs.
Main Results:
- Abnormal symmetry in double-limb support periods (ratio: 0.74).
- Significantly longer double-limb support time for the amputated leg compared to the contralateral leg (0.211s vs 0.173s).
- Shorter step length for the normal leg compared to the amputated leg (0.709m vs 0.752m).
Conclusions:
- Gait asymmetry in below-knee amputees is evident in double-limb support and step length.
- Prosthetic ankle-foot component limitations significantly impact gait kinematics.
- These findings highlight the need for improved prosthetic designs to restore natural gait function.