Foot loading characteristics of different graduations of partial weight bearing.

Limited weight bearing of the lower extremity is a commonly applied procedure in orthopaedic rehabilitation after reconstructive forefoot surgery, trauma surgery and joint replacement. The most frequent limitations are given as percentage of body weight (BW) and represent 10 or 50% BW. The extent of foot loading under these graduations of partial weight bearing has not yet been described in detail. The objective of this study was to investigate forces at the foot-sole interface, which occur under graduated limitations of weight bearing. Peak pressure, maximum force, pressure-time integral and force-time integral (Pedar Cable) were assessed for a total of three trials with 10 healthy individuals. The results from limited weight bearing with 10 or 50% BW as taught by an experienced physiotherapist with a bathroom scale were referred to results of a normal gait. The limitation of weight bearing to 10% BW was equal to a bisection of peak pressure and maximum force for the total foot. Halved BW left a remaining 82% of peak pressure and 59% of maximum force for the total foot. We concluded that weight-bearing limitations to 10 and 50% BW lead to discernible differences in foot loading and may be applied to graduate forces of the lower limb for rehabilitation purposes. Foot loading with partial weight bearing exerts the percentage of BW and should be monitored to avoid an exertion of strains on the lower limb.