Load applied on bone-anchored transfemoral prosthesis: Characterization of a prosthesis— A pilot study

摘要

The objectives of this study were to (1) record the innerprosthesis loading during activities of daily living (ADLs), (2) present a set of variables comparing loading data, and (3) provide an example of characterization of two prostheses. The load was measured at 200 Hz using a multiaxial transducer mounted between the residuum and the knee of an individual with unilateral transfemoral amputation fitted with a boneanchored prosthesis. The load was measured while using two different prosthetic knees, mechanical (PRO1) and microprocessorcontrolled (PRO2), during six ADLs. The characterization of the prostheses was achieved using a set of variables split into four categories, including temporal characteristics, maximum loading, loading slopes, and impulse. Approximately 360 gait cycles were analyzed for each prosthesis. PRO1 showed a cadence improved by 19% and 7%, a maximum force on the long axis reduced by 11% and 19%, and an impulse reduced by 32% and 15% during descent of incline and stairs compared with PRO2, respectively. This work confirmed that the proposed apparatus and characterization can reveal how changes of prosthetic components are translated into innerprosthetic loading.