The High-Fidelity (HiFi) interface is an emerging transfemoral interface technology. However, no comparison of this interface to traditional transfemoral interface designs is currently available. The purpose of this study is to measure the effects of the HiFi system on gait and perceived disability compared with a traditional socket design in a subject with transfemoral amputation.
The subject was first tested with a traditional ischial containment socket, then fit with the HiFi system, and tested again after a 30-day accommodation period. Three-dimensional motion analysis was performed using an 8-camera Vicon Motion Capture system. The Oswestry Low Back Pain Disability Questionnaire v2.0 and Western Ontario and McMaster University Osteoarthritis index were administered at initial and secondary testing to evaluate perceived disability. A one-way analysis of variance and Fischer's least significant difference were used to determine statistical difference between conditions. The level of significance for all tests was set at P ≤ 0.05.
Notable results included an increase in self-selected gait velocity, prosthetic hip adduction, and hip extension. Reductions in lateral center of mass deviation during gait and in perceived disability was also shown with use of the HiFi condition.
This study analyzed the effects of the HiFi Interface System on biomechanical parameters of gait and perceived disability compared with a baseline IRC condition in this elderly subject with history of TF amputation. Several improvements and markers of increased stability with use of the HiFi were noted. Perceived disability was also greatly improved comparatively.
The HiFi Interface System presented some biomechanical advantages to traditional IRC socket designs in this case, which may allow for increased stability in patients utilizing a TF prosthesis. Further research with larger samples is warranted.
TYLER D. KLENOW, MSOP, CPO, CPT, is affiliated with James A. Haley Veterans Administration Hospital, Prosthetics and Sensory Aids Service, Tampa, Florida.
TYLER D. KLENOW, MSOP, CPO, CPT, is affiliated with K & K Innovations, Tampa, Florida.
TYLER D. KLENOW, MSOP, CPO, CPT; and JASON T. KAHLE, MSMS, CPO, FAAOP, are affiliated with Prosthetic & Amputee Rehabilitation & Research Foundation, Tampa, Florida.
JASON T. KAHLE, MSMS, CPO, FAAOP, is affiliated with OP Solutions, Inc, Tampa, Florida.
JASON T. KAHLE, MSMS, CPO, FAAOP, is affiliated with Prosthetic Design and Research, Tampa, Florida.
FRANK J. FEDEL, MS, CES; and JEFFREY ROPP, BS, CP, are affiliated with Eastern Michigan University, College of Health and Human Services, School of Health Promotion and Human Performance, Master of Science in Orthotics and Prosthetics Program, Ypsilanti, Michigan.
JEFFREY ROPP, BS, CP, is affiliated with Ropp Orthopedic Clinic, Commerce, Michigan.
M. JASON HIGHSMITH, PhD, DPT, CP, FAAOP, is affiliated with Veterans' Affairs & Department of Defense, Extremity Trauma & Amputation Center of Excellence, Tampa, Florida.
M. JASON HIGHSMITH, PhD, DPT, CP, FAAOP, is affiliated with University of South Florida, Morsani College of Medicine, School of Physical Therapy & Rehabilitation Sciences, Tampa, Florida.
M. JASON HIGHSMITH, PhD, DPT, CP, FAAOP, is affiliated with US Army Reserves, 319th Minimal Care Detachment, Pinellas Park, Florida.
Disclosure: The authors declare no conflict of interest.
Conflicts of interest: Jeff Ropp, BS, CP, of Ropp Orthopedic Clinic is a licensed provider of the High-Fidelity Interface System.
Disclaimer: Contents of the manuscript represent those of the authors and not those of the Department of Defense, the Department of Veterans Affairs, or the Federal Government of the United States of America.
Funding for this project was provided by: National Institutes of Health Scholars in Patient Oriented Research (SPOR) grant (1K30RR22270).
Declaration of Submission: The worked described here has not been published previously, is not under consideration for publication elsewhere, and has been approved by all authors and responsible authorities. If accepted, it will not be published elsewhere in any form or language.
Correspondence to: Tyler D. Klenow, MSOP, CO, CPT-ACSM, James A. Haley Veterans’ Hospital Polytrauma/SCI Rehabilitation Center Prosthetics and Sensory Aides Service, 13000 Bruce B. Downs Blvd, Tampa, FL 33612; email: firstname.lastname@example.org