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Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Running-specific prostheses limit ground-force during sprinting.

Alena M Grabowski1, Craig P McGowan, William J McDermott

  • 1Biomechatronics Group, Massachusetts Institute of Technology, Cambridge, MA, USA. alenag@mit.edu

Biology Letters
|November 6, 2009
PubMed
Summary
This summary is machine-generated.

Elite amputee sprinters using running-specific prostheses (RSP) generate less force with their affected leg. Compensatory rapid leg swing may help them achieve top speeds despite this limitation.

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Area of Science:

  • Biomechanics
  • Sports Science
  • Prosthetics

Background:

  • Running-specific prostheses (RSP) mimic biological limb function.
  • Limited understanding of how amputees achieve high running speeds with RSP.

Purpose of the Study:

  • Investigate biomechanical effects of RSP during sprinting.
  • Compare affected leg (AL) and unaffected leg (UL) function in unilateral amputees.

Main Methods:

  • Measured ground reaction forces (GRF) and stride kinematics.
  • Studied elite unilateral trans-tibial amputee sprinters across various speeds.

Main Results:

  • Affected leg (AL) showed ~9% less average vertical GRF than unaffected leg (UL) at top speed (p < 0.0001).
  • Leg swing times were not significantly different between AL and UL, and comparable to non-amputee sprinters.
  • RSP appear to impair force generation in the affected limb.

Conclusions:

  • Running-specific prostheses may limit amputee sprinters' top speed due to reduced force generation.
  • Elite amputee sprinters may compensate for impaired force with rapid leg swing of both limbs.