title: Load applied on bone-anchored transfemoral prosthesis: characterization of a prosthesis-a pilot study.
abstract: The objectives of this study were to (1) record the inner-prosthesis 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 multi-axial transducer mounted between the residuum and the knee of an individual with unilateral transfemoral amputation fitted with a bone-anchored prosthesis. The load was measured while using two different prosthetic knees, mechanical (PRO1) and micro processor-controlled (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 inner-prosthetic loading.
authors.affiliation: Department of Kinesiology, Université du Québec à Montréal, C.P. 2222, Succursale, Centre-Ville, Montréal, Québec, H3C 3P8 Canada. laurentfrossard@yahoo.com.au.
authors.forename: Laurent
authors.initials: L
authors.lastname: Frossard
authors.forename: Eva
authors.initials: E
authors.lastname: Häggström
authors.forename: Kerstin
authors.initials: K
authors.lastname: Hagberg
authors.forename: Rickard
authors.initials: R
authors.lastname: Brånemark
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000671:Amputation, Surgical / Q000534:rehabilitation*; D001186:Artificial Limbs; D001696:Biomechanical Phenomena; D005684:Gait / Q000502:physiology; D006801:Humans; D007719:Knee Joint; D035002:Lower Extremity; D008297:Male; D016348:Osseointegration; D010865:Pilot Projects; D013314:Stress, Mechanical; D014159:Transducers