Use of a load cell and force–moment curves to compare transverse plane moment loads on transtibial residual limbs: A preliminary investigation

Background and aim: The objective of this study was to demonstrate how a load cell and force–moment curves can be used outside of a gait lab to directly measure and evaluate the transverse plane loading moment on transtibial residual limbs. Technique: A load cell was attached distally to the socket of three transtibial amputees who walked a straight path and a circle of 3.048-m diameter with the prosthetic foot both inside and outside the curved path. Discussion: Compared to straight path walking, transverse plane moment decreased when the foot was on the outside of the curved path. When the foot was on the inside, the moment did not exceed that for straight path walking for two participants; maximum transverse moment was approximately 0.15 N m/kg of body mass. Force–moment curves indicated that each participant’s gait was unique, but underlying similarities were observed with respect to each of the three conditions. Clinical relevance A load cell in conjunction with curved and straight path walking and force–moment curves can be used outside of a gait lab to measure and examine the transverse plane loading on the residual limb.