Journal article
Evidence-Based Recommendation Of A Powered Knee For Transfemoral Bone-Anchored Prostheses: A Cross-Sectional Study
Canadian Prosthetics & Orthotics Journals, Vol.8(2), pp.1-35
2025
PMCID: PMC12614324
PMID: 41245905
Abstract
BACKGROUND: A transfemoral bone-anchored prosthesis (TF-BAP) can be fitted with non-microprocessor-controlled knees (N-MPKs), or with microprocessor-controlled knees, which can be passive (P-MPKs) or active (A-MPKs). The next generation of A-MPKs, including powered knees, is emerging. The understanding of the loading applied on TF-BAP fitted with these A-MPKs is limited.
OBJECTIVE: This cross-sectional study aimed to characterize the load applied on instrumented TF-BAP fitted with an A-MPK (Power Knee, Össur, Iceland) during standardized daily activities. Furthermore, some load characteristics applied during walking were compared with TF-BAP fitted with N-MPK and P-MPK reported in the literature using similar approach.
METHODOLOGY: Thirteen males fitted with a transfemoral press-fit osseointegrated implant participated in this study between 2021 and 2022. Forces and moments applied on the instrumented TF-BAP, fitted with a Power Knee (PKA01) and Pro-Flex (LP, XC) or Balance S feet (ÖSSUR, Iceland), were measured wirelessly using an iPecsLab (RTC Electronics, USA) during walking, ascending and descending ramp and stairs. We followed a 28-step process to characterize the loading pattern considering spatiotemporal gaits variables as well as loading boundaries and extrema.
FINDINGS: Overall, 1,327 steps were analyzed. The cadence ranged between 34 ± 6 and 49 ± 13 strides/min. The maximum forces and moments recorded on the long, anteroposterior and mediolateral axes of the transducer were 1,258 N, 331 N and 234 N as well as 19 Nm, 74 Nm and 91 Nm, respectively.
CONCLUSION: The Power Knee, combined with Pro-Flex or Balance S feet, may improve participants’ capacity to ambulate. Comparations with reference values indicated that transitions from N-MPKs or P-MPKs to the Power Knee are considered safe and likely to improve efficiency. This study contributed to evidence-based recommendations of TF-BAP fitted with powered knees. Hopefully, this work will advance clinical practice guidelines for the growing population choosing bionic solutions.
Details
- Title
- Evidence-Based Recommendation Of A Powered Knee For Transfemoral Bone-Anchored Prostheses: A Cross-Sectional Study
- Authors
- Laurent Frossard (Corresponding Author) - University of the Sunshine Coast, Queensland, School of HealthStefan Laux - APC Prosthetics Pty LtdMarta Geada - APC Prosthetics Pty LtdLisa Tronicke - Össur (Iceland)Thor Fridriksson - Össur (Iceland)Knut Lechler - Össur (Iceland)
- Publication details
- Canadian Prosthetics & Orthotics Journals, Vol.8(2), pp.1-35
- Publisher
- Canadian Online Publication Group
- Date published
- 2025
- DOI
- 10.33137/cpoj.v8i2.45790
- ISSN
- 2561-987X
- PMID
- 41245905; PMC12614324
- Copyright note
- Copyright (c) 2025 - Laurent Frossard, Stefan Laux, Marta Geada, Lisa Tronicke, Thor Fridriksson, Knut Lechler. This work is licensed under a Creative Commons Attribution 4.0 International License.
- Grant note
- This study was solely funded by ÖSSUR, Iceland.
- Organisation Unit
- School of Health and Behavioural Sciences - Legacy
- Language
- English
- Record Identifier
- 991192142402621
- Output Type
- Journal article
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