Patients with short lower-extremity amputation stumps exhibit poor prosthetic fit and inefficient gait. Often they are fit at the next-higher prosthetic level, increasing energy consumption. This study aimed to characterize the risk/benefit ratio of stump lengthening with planar external fixators. All patients lengthened for functionally short amputation stumps were reviewed. Outcome measures included changes in prosthetic use, soft tissue problems, qualitative gait analysis, and surgical complications. Patients averaged 15.1 years of age at surgery, with 4.1 years of follow-up. The average lengthening index was 9.2 mm/mo. Femoral lengthenings obtained more length (8.7 vs. 6.9 cm). After treatment, prosthetic skin-related complications decreased and qualitative gait parameters improved. Most (85%) wore a standard prosthesis for their amputation level after surgery, whereas none could before. There were 1.4 complications per patient, all successfully surgically treated. Lengthening is time-consuming and associated with frequent complications but results in improved gait and energy consumption.
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