INFLUENCE OF SHOES AND HEEL STRIKE ON THE LOADING OF THE HIP-JOINT

The forces and moments acting at the hip joint influence the long-term stability of the fixation of endoprostheses and the course of coxarth rosis. These loads may depend on the kind of footwear and the walking or running style. These factors were investigated in a patient with in strumented hip implants. He wore different sports shoes, normal leathe r shoes, hiking boots and clogs and walked barefoot with soft, normal and hard heel strikes. The loads were lowest while walking and jogging without shoes. All shoes increased the joint force and the bending mo ment at the implant slightly, but the torsional moment rose by up to 5 0%. No relation was found between the different type of shoes and the load increase, only shoes with very hard soles were clearly disadvanta geous. Soft heels, soles or insoles did not offer advantages. Gait sta bility seems to play the most important role in increasing the joint l oading and should be the criterion for the choice of footwear. Smooth gait patterns with soft heel strikes are the only means to reduce join t loading during slow jogging.