Study
Human FactorsRecentModerate effect

Transfemoral limb loss increases walking metabolic cost by up to 9.3%

Simulations indicate that transfemoral limb loss inherently increases the metabolic cost of walking, even when optimizing for efficiency and minimizing deviations from normal gait.

bioRxiv (Cold Spring Harbor Laboratory) · 2023

01

Key Findings

  • 01Metabolic cost of walking increased by 0.7-9.3% post-transfemoral limb loss.
  • 02The increase in metabolic cost was dependent on how cost was scaled (total body mass vs. biological body mass) and the type of prosthetic knee used (passive vs. non-passive).
02

Application

Design takeaway

Designers of transfemoral prosthetics should prioritize energy efficiency and consider the impact of different prosthetic knee mechanisms on metabolic cost.

How to apply

When designing or evaluating transfemoral prosthetic components, consider their impact on the user's overall energy expenditure during walking.

Project actions

  • 01When researching prosthetic devices, look for studies that measure energy expenditure.
  • 02Consider how different prosthetic components might affect a user's overall physical effort.
03

Method & Evidence

AimTo determine if transfemoral limb loss, in isolation, increases the metabolic cost of walking through optimal control simulations.
MethodSimulation Study
ProcedureOptimal control simulations of walking were performed using OpenSim Moco on virtual subjects. The simulations minimized a weighted sum of deviations from average able-bodied gait mechanics and the gross metabolic cost of walking. This was done both with two intact limbs and with one limb replaced by a transfemoral prosthesis, with no other model modifications.
Sample15 virtual subjects
ContextBiomechanics and Prosthetics

Variables

IVTransfemoral limb loss (presence vs. absence)
DVMetabolic cost of walking
CVVirtual subject model, gait mechanics optimization parameters, prosthetic knee type (in some comparisons)
04

Strengths & Limitations

Strengths

  • +Uses a sophisticated simulation method (optimal control) to isolate the effect of limb loss.
  • +Investigates different scaling methods for metabolic cost and prosthetic knee types.

Limitations

Simulations are simplified models; real-world factors like muscle fatigue, user skill, and environmental conditions are not fully captured.

Reliability & validity

The use of a standardized simulation environment (OpenSim Moco) and a consistent methodology across virtual subjects contributes to reliability. Validity is supported by the simulation's aim to model biomechanical principles, though direct experimental validation would be needed.

Think critically

How might the 'optimal control' aspect of the simulation influence the findings, and what real-world adaptations might a user make that differ from this optimized model?

05

Design Principles

"Minimize metabolic cost in prosthetic limb design to improve user mobility and reduce physiological strain."

Understanding the physiological impact of limb loss is crucial for designing more effective prosthetic devices and rehabilitation strategies. This research highlights that even with advanced simulation techniques, the absence of a limb presents a fundamental challenge to efficient locomotion.

06

What This Means for Your Design

Losing a leg above the knee makes it harder to walk, even with a good prosthetic, because the body has to work more to move.

How to use in your project

  • 1.Use findings on metabolic cost to justify design choices for prosthetic components or rehabilitation tools.
  • 2.Cite this study when discussing the biomechanical challenges of limb loss in your design project.
07

Add to My Project

08

Quick Cite

(2023). Transfemoral limb loss modestly increases the metabolic cost of optimal control simulations of walking. bioRxiv (Cold Spring Harbor Laboratory). https://doi.org/10.1101/2023.06.26.546515 Retrieved from https://designdex.org/study/322d906b-9a93-4315-873e-b5f2d6ae6286/transfemoral-limb-loss-increases-walking-metabolic-cost-by-up-to-9-3

Paragraph starter

Research indicates that transfemoral limb loss inherently increases the metabolic cost of walking by up to 9.3% compared to able-bodied individuals, even when optimizing for gait mechanics. This suggests that prosthetic design must actively address energy efficiency to mitigate this physiological burden.

09

Source

bioRxiv (Cold Spring Harbor Laboratory)

Transfemoral limb loss modestly increases the metabolic cost of optimal control simulations of walking

journal · 2023

View source

Questions about this research

What does the research say about transfemoral limb loss increases walking metabolic cost by up to 9.3%?
Designers of transfemoral prosthetics should prioritize energy efficiency and consider the impact of different prosthetic knee mechanisms on metabolic cost. Evidence: bioRxiv (Cold Spring Harbor Laboratory) (2023).
Why does "Transfemoral limb loss increases walking metabolic cost by up to 9.3%" matter for design?
Understanding the physiological impact of limb loss is crucial for designing more effective prosthetic devices and rehabilitation strategies. This research highlights that even with advanced simulation techniques, the absence of a limb presents a fundamental challenge to efficient locomotion.
How can designers apply this research?
Designers of transfemoral prosthetics should prioritize energy efficiency and consider the impact of different prosthetic knee mechanisms on metabolic cost.
What were the main findings?
Metabolic cost of walking increased by 0.7-9.3% post-transfemoral limb loss.. The increase in metabolic cost was dependent on how cost was scaled (total body mass vs. biological body mass) and the type of prosthetic knee used (passive vs. non-passive).
What research method was used?
Simulation Study with 15 virtual subjects.
How strong is the evidence?
Evidence strength is rated Moderate effect, based on a 2023 journal from bioRxiv (Cold Spring Harbor Laboratory).
What should I do differently in my next project?
When designing or evaluating transfemoral prosthetic components, consider their impact on the user's overall energy expenditure during walking.
What are the limitations?
The study used virtual subjects and optimal control simulations, which may not perfectly replicate real-world walking biomechanics and individual user adaptations.
Is there evidence that limb loss affects design outcomes?
Computer models show that losing a leg above the knee makes walking harder, requiring more energy, with the exact increase depending on how energy use is measured and the type of prosthetic knee. Understanding the physiological impact of limb loss is crucial for designing more effective prosthetic devices and rehabilit Source: bioRxiv (Cold Spring Harbor Laboratory) (2023).
Where does this metabolic cost research apply?
Biomechanics and Prosthetics It sits within human factors research on designdex.org.

Related research topics

limb loss design research · evidence on limb loss · does limb loss improve design outcomes · metabolic cost studies for designers · limb loss and metabolic cost findings · human factors research evidence