Reactive Biomechanics: Study Shows Lack of Consensus About Ankle Function, and an Inclusive Resolution with Divergent Reactive Leverage is Proposed


Thomas J. Cutler


Limbitless, LLC

Document Type


Proper science is essential for proper clinical intervention. Since science is assumed to have been properly vetted and challenged, revisiting the veracity of fundamental scientific premises is rarely
done, but may reveal valuable insights. Any new insights would be of critical importance to the medical community. The mechanical advantage of the human ankle is historically understood in medical and
research communities to be a class 2 lever (1). Rather than understanding from only one perspective, it is possible to gain insights by recognizing ankle forces in both the active and reactive directions. Current efforts (2) seek new insights that affect interventions based on ankle models. In addition to the textbook presentation of a class 2 lever, the ankle may also be understood in the reactive direction to gravity as a class 1 lever. Since both the action and the reaction of gravity apply to the ankle at all times, the best understanding of the ankle will incorporate both lever classes. Reactive Biomechanics looks at loads in both active and reactive directions in an effort to advance our understanding of the human body.

Thomas also would like to share a presentation with the conference attendees, with the following summary:

Is every issue caused by the socket? Surgeons are told to remove the IT band during transfemoral amputation, and to not be concerned about an open medullary cavity or the lack of skeletal support. Is this wise? We look at the history of transfemoral amputation, break down the surgical goals and the rationales behind them, and propose a safer alternative to percutaneous osseointegration as a solution to improve quality of life for amputees. The Amplant implant is internal, simple, and may even reduce prosthetist time chasing volume loss by more than 60%.

A link to this discussion can be found by click the 'View Presentation' button.


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