Article

There is a need for a prosthetic knee joint design that is
technologically and functionally appropriate for use in developing countries.
OBJECTIVES: To develop and clinically evaluate a new type of stance phase
controlled prosthetic knee joint that provides stance phase stability without
inhibiting swing phase flexion. STUDY DESIGN: A crossover repeated measures study
design comparing the new knee joint to the participant's conventional low- or
high-end prosthetic knee joint. METHODS: The new knee joint was fitted to
fourteen individuals aged 15 to 67 years with unilateral lower limb amputations.
Walk tests were performed to measure walking speed. Energy expenditure was
estimated using the physiological cost index (PCI). RESULTS: Walking speeds with
the new knee joint were on average 0.14 m/s faster than conventional low-end
knees (p < 0.0001), but 0.07 m/s slower than conventional high-end prosthetic
knees (p = 0.008). The PCI was similar across all three knee joint technologies
(p = 0.276). CONCLUSIONS: Mobility function with the new knee joint, in terms of
walking speed, was more closely matched to high-end than low-end prosthetic knee
joints. Therefore, given its relatively simple design, the new stance phase
control mechanism may offer a functional and cost effective solution for active
transfemoral amputees. CLINICAL RELEVANCE: This paper describes a new type of
prosthetic knee joint mechanism that is intended to be cost-effective while
providing high-level stance phase function to active individuals with a
transfemoral amputation. Initial clinical testing suggests that the new knee joint may have some functional advantages over existing technologies in this
category.

Langue : ANGLAIS