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The Functionality of the Bio-Mechanical Prosthetic Finger When Compared With Results on Standardized and Functional Assessments

A Single-Case Study

Denham, Susan P., EdD, OTR/L, CHT; Hawkins, Taylor, OTR/L; Johnson, Kelsey, OTR/L; Rhoads, Jenna, OTR/L; Sims, Sara, OTR/L

JPO: Journal of Prosthetics and Orthotics: April 2019 - Volume 31 - Issue 2 - p 140–144
doi: 10.1097/JPO.0000000000000242

Introduction The purpose of this study was to examine the functionality of the bio-mechanical prosthetic finger (BPF). The researchers administered various assessments to examine how the BPF performed in comparison with the affected hand without the BPF, as well as the unaffected hand.

Materials and Methods A single subject participant with amputations at the proximal phalanx of the third and fourth digits was recruited for this study. The subject was assessed without a prosthetic device and while wearing a BPF on each digit. The researchers also assessed the uninvolved hand for comparison. The following standardized assessments were administered: Minnesota Manual Dexterity Test, Jamar Hand Function Test, and Box and Blocks Test. Two qualitative questionnaires and The Disabilities of the Arm, Shoulder, and Hand (DASH) Questionnaire were also administered to examine the participant's abilities and satisfaction with and without the prosthetic device.

Results The results were analyzed to assess the difference in performance with and without the prosthetic device as compared with the unaffected side. The results indicated that the participant performed at a higher level on all assessments while using the BPF. In addition, the participant reported a higher level of comfort and satisfaction while using the prosthesis.

Conclusions The results of the study showed that the BPF is a viable option for digit amputations to restore function in daily tasks.

SUSAN P. DENHAM EDD, OTR/L, CHT; TAYLOR HAWKINS, OTR/L; KELSEY JOHNSON, OTR/L; JENNA RHOADS, OTR/L; and SARA SIMS, OTR/L, are affiliated with the Department of Occupational Therapy, Alabama State University, Montgomery, AL.

Disclosure: The authors declare no conflict of interest.

Correspondence to: Susan P. Denham, EdD, OTR/L, CHT, PO Box 271, Montgomery, AL 36101; email:

© 2019 by the American Academy of Orthotists and Prosthetists.