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Vibrotactile evaluation: Osseointegrated versus socket-suspended transfemoral prostheses

Vibrotactile evaluation: Osseointegrated versus socket-suspended transfemoral prostheses. Eva Häggström, CPO; Kerstin Hagberg, PT, PhD; Björn Rydevik, MD, PhD; Rickard Brånemark, MD, PhD. Aim

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Vibrotactile evaluation: Osseointegrated versus socket-suspended transfemoral prostheses

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  1. Vibrotactile evaluation: Osseointegrated versus socket-suspended transfemoral prostheses Eva Häggström, CPO; Kerstin Hagberg, PT, PhD; Björn Rydevik, MD, PhD; Rickard Brånemark, MD, PhD

  2. Aim • Investigate vibrometric stimuli detection thresholds of patients with transfemoral amputation with osseointegrated (OI) versus socket-suspended prostheses. • Relevance • Improved ability to detect vibration at heel strike could mean safer walking for this group of patients.

  3. Method • Subjects: • OI (n = 17): Tested preoperatively with socket-suspended prostheses and after 2 yr with OI prostheses. • Controls (n = 17): Used socket-suspended prostheses, evaluated once. • Prosthetic and intact feet assessed at 8, 16, 32, 64, 125, and 250 Hz. • Transmission of vibrometric signals through test prosthesis was also measured.

  4. Results • OI prosthetic connection improved patients’ ability to detect vibrotactile stimuli of higher frequencies applied under prosthetic foot. • At 2 yr follow-up: • OI group showed lower detection threshold at 125 Hz than in preoperative measurement. • OI group had lower detection threshold than controls at both 125 and 250 Hz.

  5. Conclusion • Study provides insight into mechanisms of vibration transmission between exterior and bone-anchored as well as socket-suspended amputation prostheses. • Improved osseoperception might explain why patients with OI prostheses have described prosthesis as feeling like a “a part of them.” • Results add to published benefits of OI prostheses.

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