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Related Concept Videos

Ankle Joint01:10

Ankle Joint

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The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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Bones of the Lower Limb: Tibia and Fibula01:10

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The tibia is the main weight-bearing bone of the lower leg. It is larger than the fibula with which it is paired. The tibia is also the second longest bone in the body and is located right below the skin. The proximal end of the tibia forms the medial and the lateral condyle, which articulates with the condyles of the femur to form the knee joint. Between the articulating surfaces is the irregular elevated area known as the intercondylar eminence that serves as the inferior attachment point for...
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Related Experiment Video

Updated: May 1, 2026

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Amputation effects on the underlying complexity within transtibial amputee ankle motion.

Shane R Wurdeman1, Sara A Myers1, Nicholas Stergiou1

  • 1Nebraska Biomechanics Core Facility, University of Nebraska at Omaha, Omaha, Nebraska 68182, USA.

Chaos (Woodbury, N.Y.)
|April 5, 2014
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Summary

Lower limb amputation may reduce gait complexity. A "more appropriate" prosthesis can help restore movement complexity in the prosthetic ankle, suggesting improved prosthetic rehabilitation for amputees.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Rehabilitation Engineering

Background:

  • Walking is a complex, adaptable form of locomotion.
  • Lower limb amputation can impact gait dynamics and adaptability.
  • Prosthetic rehabilitation aims to restore functional mobility.

Purpose of the Study:

  • To investigate if lower limb amputation and prosthetic use alter gait complexity.
  • To compare the effects of

Main Methods:

  • Twenty-eight transtibial amputees participated in a 6-week randomized crossover study.
  • Subjects adapted to two prostheses: one
  • Ankle kinematics were recorded during treadmill walking and analyzed for complexity using pseudoperiodic surrogation analysis.

Main Results:

  • Deterministic structure was found in both prosthetic and sound ankle motion.
  • The prosthetic ankle showed a higher likelihood of complexity loss compared to the sound ankle.
  • A
  • Sample entropy was less susceptible to intracycle periodic dynamics than the largest Lyapunov exponent.

Conclusions:

  • Lower limb amputation can reduce gait complexity, particularly in the prosthetic limb.
  • Appropriate prosthetic selection is crucial for restoring healthy movement complexity.
  • Adaptation did not significantly alter complexity in experienced prosthesis users.