Effect of femoral to tibial varus mismatch on the contact area of unicondylar knee prostheses.

In unicondylar knee prostheses, the relative angle and congruency of the femoral against the tibial component is not mechanically constrained and may vary with the surgical implantation technique. The contact area between both components was measured with increasing varus (0-20 degrees) and flexion angles (-20 degrees to 90 degrees) in five prosthesis models in the laboratory. The contact area varied with the relative position of the components and was critically reduced up to 70% at a varus range between >5 degrees and <25 degrees.

Primary isolated subtalar arthrodesis: outcome after 2 to 5 years followup.

Background: Favorable to excellent clinical results have been reported for isolated subtalar joint arthrodesis. Pedobarography after subtalar bone-block distraction arthrodesis have demonstrated a more laterally shifted gait line. However pedobarographic measurements after primary in-situ isolated subtalar arthrodesis have not been reported.

Ground reaction forces on stairs: effects of stair inclination and age.

The goals of the study were to compare data of vertical ground reaction force (GRF) parameters during level walking, stair ascent and descent on three different stair inclinations and three different age groups. Twenty healthy subjects of three age groups (young 33.7 years; middle 63.