The effect of the transfemoral prosthetic socket interface designs on skeletal motion and socket comfort: A randomized clinical trial

• Published in: Prosthetics and orthotics international Vol. 44; no. 3; p. 145
• Main Authors: Kahle, Jason, Miro, Rebecca Maria, Ho, Loi T, Porter, Michael, Lura, Derek J, Carey, Stephanie L, Lunseth, Paul, Highsmith, James, Highsmith, M Jason
• Format: Journal Article
• Language: English
• Published: France 01.06.2020
• Subjects: Adult; Artificial Limbs; Female; Humans; Lower Extremity; Male; Middle Aged; Prosthesis Design - instrumentation; Prosthesis Fitting - instrumentation; Single-Blind Method; Weight-Bearing; biomechanics; prosthetic interface mechanics; prosthetic design; prosthetics; Biomechanics of prosthetic/orthotic devices
• ISSN: 1746-1553
• DOI: 10.1177/0309364620913459

The most crucial aspect of a prosthesis is the socket, as it will directly determine gait stability and quality. The current standard of care ischial ramus containment socket is reported to increase coronal stability through gait; however, socket discomfort is the primary complaint among prosthetic users. The purpose of this study is to compare ischial ramus containment to alternatives in the transfemoral amputee population. All subjects were fit with three different sockets: traditional ischial ramus containment, a dynamic socket, and a sub-ischial. In this study, authors hypothesized socket skeletal motion would be equivalent across interventions. Single-blind, repeated-measures, three-period randomized crossover clinical trial. Outcome measures were socket comfort score and skeletal motion, viewed coronally with X-ray measuring the position of the skeleton in relationship to the socket in full weight-bearing and full un-loading. The mean age was 38.2 and mean Amputee Mobility Predictor score was 40. Mean vertical movement, horizontal movement, single limb prosthetic stance, mean femoral adduction in swing and stance, and median socket comfort score were not statistically different. The socket design did not significantly effect skeletal motion and socket comfort. All socket designs are suitable depending on the patient-centric preferences and prosthetist skill set. The comfort of the standard of care transfemoral amputation socket has been widely reported as problematic. A comparison of alternative designs in a controlled clinical trial environment will assist the clinician in understanding the impact of design regarding skeletal motion and comfort. Users could benefit from alternatives applied in clinical practice.