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Knee Joint

Knee Joint

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.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

Bones of the Lower Limb: Femur and Patella

Bones of the Lower Limb: Femur and Patella

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 neck...

Development of the Limb Synovial Joints

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
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Ankle Joint

Ankle Joint

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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Structural Joints: Synovial Joints

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Related Experiment Video

Updated: May 25, 2026

Tissue Collection and RNA Extraction from the Human Osteoarthritic Knee Joint

Tissue Collection and RNA Extraction from the Human Osteoarthritic Knee Joint

Published on: July 22, 2021

Self-adjusting, isostatic exoskeleton for the human knee joint.

Viet Anh Dung Cai¹, Philippe Bidaud, Vincent Hayward

¹UPMC Univ Paris 06, Institut des Systèmes Intelligents et de Robotique, Paris, France. cai@isir.upmc.fr

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 19, 2012

Summary

This study presents a novel knee-joint exoskeleton that self-adjusts to physiological movements, applying programmable torques without constraining the joint. Preliminary tests validate this innovative design for natural limb motion tracking.

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Area of Science:

Biomechanics
Robotics
Rehabilitation Engineering

Background:

Existing exoskeletons often lack adaptability to individual physiological movements.
Precise torque application around the joint's rotational axis is crucial for natural motion assistance.
Unconstrained tracking of limb movements is a key challenge in exoskeleton design.

Purpose of the Study:

To describe a knee-joint exoskeleton capable of applying programmable torques.
To achieve self-adjustment to physiological joint movements, automatically aligning torque with the joint's rotational axis.
To ensure the exoskeleton tracks limb movements without introducing constraints.

Main Methods:

Discussion of design requirements and conditions for spatial relative limb movement tracking.
Development of a self-adjusting mechanism for programmable torque application.
Prototyping and preliminary testing to validate the design principles.

Main Results:

The developed exoskeleton successfully applies programmable torques to the knee joint.
The self-adjustment mechanism ensures torque is centered around the physiological rotational axis.
The system demonstrated the ability to track limb movements without imposing constraints when specified conditions are met.

Conclusions:

The described knee-joint exoskeleton design offers a promising approach for unconstrained, physiologically aligned motion assistance.
The prototype validation confirms the feasibility of self-adjusting programmable torque application.
This technology has potential applications in rehabilitation, assistive devices, and biomechanical research.