ACPOC - The Association of Children's Prosthetic-Orthotic Clinics Founded in 1978

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Isokinetic Strength Differences between Nonprosthetic and Prosthetic Limbs in Below-Knee-Amputee Children

The purpose of this pilot study was to compare the isokinetic strength differences between nonprosthetic (NP) and prosthetic (P) limbs in below-knee-amputee (BKA) children. A KinCom machine was used to test the concentric and eccentric muscle strength of 6 BKA children for flexion and extension at the knee, at 60 degrees/second with a minimum load of 20Nm. The peak torques were determined and the NP results were divided by the P results, then multiplied by 100 to indicate a percent of strength difference. A minimum of three trials were collected and averaged between and within subjects. Results generally indicated that the NP side was stronger than the P side for the knee with a greater difference occurring with concentric contractions than with eccentric contractions (Table 1). Based upon this small number of subjects it is speculated that the strength differences may be a factor in the asymmetrical gait patterns in BKA children. It is suggested that attempts be made to strengthen the P side to that of the NP side.

Alberta Children's Hospital, Physiotherapy Department, 1820 Richmond Road, S.W Calgary, Alberta, Canada T2T 5C7