Estimated forces and moments experienced by osseointegrated endoprostheses for lower extremity amputees.
Carolyn E Taylor, Yue Zhang, Yuqing Qiu and 3 others
PMID 32485424WHAT IT FOUND
Estimated loads at a simulated osseointegrated leg prosthesis interface differed by sex and residual limb length.
These are model estimates from non-amputee motion, not measured amputee outcomes.
Key findings
01Males had higher axial forces, bending moments, and torsional moments than females at all simulated above-knee levels during all activities.
02Simulated residual limb length changed axial distractive forces at every level for every activity in the thigh and shin estimates.
03Torsional moments did not vary with simulated residual limb length in the thigh and shin estimates.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The motion capture data came from non-amputee volunteers, so they do not represent how an amputee with an osseointegrated attachment may compensate. The models used non-amputee body segment properties, so the weight distribution of a prosthetic limb is not captured. Only the right leg was analysed as the amputated limb, relying on assumed symmetry. Some consented subjects and some trials were excluded for calibration or marker movement, so not every attempted activity contributed usable data. Marker clusters and functional joint centers reduce but do not remove soft tissue artefact and joint center errors.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not read these estimates as measured forces in an amputee with an osseointegrated prosthesis. The calculations were made from non-amputee motion and virtual amputation levels, so they do not show how a real amputee would load the implant.