Exploring the interaction of knee and ankle component use on mobility test performance in people with unilateral transfemoral amputation

Barnett, C.T. ORCID: 0000-0001-6898-9095, Hughes, L.D. ORCID: 0000-0002-1787-7672, Sullivan, A.E., Strutzenberger, G., Levick, J.L., Bisele, M. ORCID: 0000-0002-3785-0020 and De Asha, A.R., 2021. Exploring the interaction of knee and ankle component use on mobility test performance in people with unilateral transfemoral amputation. Prosthetics and Orthotics International, 45 (6), pp. 470-476. ISSN 0309-3646

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Abstract

Background: Ankle-foot and knee components are important determinants of mobility for individuals with transfemoral amputation. Individually, advanced ankle-foot and knee components have been shown to benefit mobility in this group of people. However, it is not clear what effect a variety of combinations of ankle-foot and knee components have on mobility test performance.

Objectives: To assess whether outcomes from mobility tests in people with unilateral transfemoral amputation are influenced by varying combinations of ankle-foot and knee components.

Study Designs: Repeated measures.

Methods: Nine adults with unilateral transfemoral amputation completed the two-minute walk test, the timed up-and-go test, the L-test, and a custom locomotion course in four randomized prosthetic conditions. These conditions were each a combination of an ankle-foot component (rigid, nonarticulating [RIG] or hydraulically articulating [HYD]) and a knee component (non–microprocessor-controlled [NMPK] or microprocessor-controlled [MPK]). The test-retest reliability and concurrent validity of the custom locomotion course were also established.

Results: The best performance in all mobility tests was associated with the MPK + HYD combination, followed by the MPK + RIG, NMPK + HYD, and NMPK + RIG combinations. This effect was statistically significant for the two-minute walk test (P = 0.01, η2p = 0.36) and on threshold for the L-test (P = 0.05, η2p = 0.36), but not statistically significant for the locomotion course (P = 0.07, η2p = 0.38) or the timed up-and-go test (P = 0.12, η2p = 0.22). Locomotion course performance had good to excellent test-retest reliability and strong concurrent validity.

Conclusion: Using a combination of a HYD ankle-foot and a MPK knee resulted in the highest performance in mobility tests. This was observed in contrast to combinations of prosthetic components that included a rigid ankle-foot component and/or a NMPK knee component.

Item Type: Journal article
Publication Title: Prosthetics and Orthotics International
Creators: Barnett, C.T., Hughes, L.D., Sullivan, A.E., Strutzenberger, G., Levick, J.L., Bisele, M. and De Asha, A.R.
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: December 2021
Volume: 45
Number: 6
ISSN: 0309-3646
Identifiers:
NumberType
10.1097/pxr.0000000000000042DOI
1565724Other
Rights: This is a pre-copyedited, author-produced version of an article accepted for publication in Prosthetics and Orthotics International. The published version of record of Barnett, C. T., Hughes, L. D., Sullivan, A. E., Strutzenberger, G., Levick, J. L., Bisele, M., & De Asha, A. R. (2021). Exploring the interaction of knee and ankle component use on mobility test performance in people with unilateral transfemoral amputation. Prosthetics and Orthotics International, 45(6), 470-476 is available online at: https://doi.org/10.1097/pxr.0000000000000042
Divisions: Schools > School of Science and Technology
Record created by: Laura Ward
Date Added: 18 Jul 2022 13:01
Last Modified: 18 Jul 2022 13:01
URI: http://irep.ntu.ac.uk/id/eprint/46625

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