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Componentry for Lower Extremity Prostheses

Dr. Friel is Associate Professor and Chair, Department of Physical Therapy, New York Institute of Technology, Old Westbury, NY.

Neither Dr. Friel nor the department with which she is affiliated has received anything of value from or owns stock in a commercial company or institution related directly or indirectly to the subject of this article.

Reprint requests: Dr. Friel, New York Institute of Technology, Room 501, Northern Boulevard, Old Westbury, NY 11568.

Prosthetic components for both transtibial and transfemoral amputations are available for patients of every level of ambulation. Most current suspension systems, knees, foot/ankle assemblies, and shock absorbers use endoskeletal construction that emphasizes total contact and weight distribution between bony structures and soft tissues. Different components offer varying benefits to energy expenditure, activity level, balance, and proprioception. Less dynamic ambulators may use fixed-cadence knees and non–dynamic response feet; higher functioning walkers benefit from dynamic response feet and variable-cadence knees. In addition, specific considerations must be kept in mind when fitting a patient with peripheral vascular disease or diabetes.