Article

The incidence of foot amputations increased in the Netherlands to
3.3/100,000 people up to 1994. Despite these numbers, only a few basic prosthetic
and orthotic devices are available, and all lack functionality to restore ankle
and foot mobility. Objectives: The aim of this explorative study was to design
and test a unique prosthesis for Syme or Pirogoff amputees with the necessary low
installation height but restoring ankle and foot mobility. Study design: A case
study was performed. Methods: The new prosthesis was designed and numerically
analyzed on aspects concerning strength and deformation. A prototype was tested
in a case study to assess the biomechanical behavior of the new foot. As a
reference, six Syme/Pirogoff amputees were measured. Additionally, all volunteers
filled out a questionnaire to evaluate their prosthetic feet. Results: The
self-selected and maximum walking speed of the case subject at 0 degrees and 5
degrees slopes was higher using the new foot (0.36 m/s and 0.53 m/s,
respectively) comparing to the Low Rider (Otto Bock HealthCare) (0.31 m/s and
0.31 m/s, respectively). Using the new foot, a more symmetrical walking pattern
was achieved. Conclusion: The case study shows that this new prosthetic foot
could be an improvement compared to existing prosthetic feet. Clinical relevance
Foot amputees with low available installation height still experience daily the
inconvenience of missing ankle and foot mobility. Their low velocity and
cosmetically poor walking pattern influence on their sound leg and overall
walking functionality. A more functional prosthesis would have a great impact on
their daily activities.

Langue : ANGLAIS