The goal of this retrospective questionnaire study is to evaluate the cost-effectiveness of non-microprocessor controlled prosthetic knees (NMPK) versus microprocessor controlled prosthetic knees (MPK) in persons with a knee-disarticulation or transfemoral amputation. The main aims are: * to provide an overview of the costs, health-related quality of life, and user experiences associated with the use of different types of prosthetic knees. * to evaluate the cost-effectiveness of the NMPK compared to the MPK for adult prosthesis users. Participants will fill out three questionnaires about (1) their medical consumption and productivity costs; (2) health-related quality of life; (3) utility, ambulation and well-being. Researchers will compare the persons with a NMPK to the persons with an MPK to investigate the cost-efficiency of both types of knees.
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Costs related to lower limb prosthesis use
Timeframe: At the baseline, participants were asked to fill out the questionnaire over a retrospective period of six months
Health-related quality of life (HRQOL) 1
Timeframe: At the baseline, participants were asked to fill out the questionnaire based on their health status that day.
Health-related quality of life (HRQOL) 2
Timeframe: At the baseline, participants were asked to fill out the questionnaire based on their health status that day.
Prosthesis-related quality of life
Timeframe: At the baseline, participants were asked to fill out the questionnaire over a retrospective period of four weeks.