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Related Concept Videos

Knee Joint01:23

Knee Joint

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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
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Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Muscles that Move the Leg01:23

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The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
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Related Experiment Video

Updated: Oct 3, 2025

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Hip-Knee Coupling Exoskeleton With Offset Theory for Walking Assistance.

Jianfeng Ma1, Decheng Sun1, Xiao Chen2

  • 1Department of Materials and Manufacturing, Beijing University of Technology, Beijing, China.

Frontiers in Bioengineering and Biotechnology
|February 17, 2022
PubMed
Summary

This study introduces a novel hip-knee coupling exoskeleton designed to enhance athletic ability in the elderly. The exoskeleton theoretically reduces human body energy expenditure by at least 20%.

Keywords:
couple mechanismexoskeletonjoint power consumptionoffset theorywalking assistance

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Area of Science:

  • Biomechanics
  • Robotics
  • Geriatric Medicine

Background:

  • Aging significantly impacts the elderly's athletic ability and independence.
  • Existing assistive devices often fail to provide seamless power assistance for complex movements.
  • There is a need for innovative solutions to support mobility in aging populations.

Purpose of the Study:

  • To design and validate a novel hip-knee coupling exoskeleton using offset theory.
  • To improve the athletic ability and reduce energy expenditure for the elderly.
  • To address the discrete power assistance challenges in knee joints.

Main Methods:

  • Development of a hip-knee coupling mechanism based on offset principles.
  • Establishment of a mathematical model for mechanism optimization and load environment analysis.
  • Proposal of a human-movement-adapted algorithm for cam profile monotonicity and sensitivity analysis.
  • Creation of a human-machine interaction model and a man-machine coupling model for verification.

Main Results:

  • The novel exoskeleton design successfully integrates hip and knee joint assistance.
  • The mathematical and man-machine coupling models verified the exoskeleton's scientific validity.
  • Comparison showed a theoretical energy saving of at least 20% for the human body when using the exoskeleton.

Conclusions:

  • The developed hip-knee coupling exoskeleton effectively enhances athletic ability.
  • The design offers a promising solution for reducing energy expenditure in the elderly.
  • This technology has the potential to improve mobility and quality of life for aging individuals.