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Introduction to Joints

Introduction to Joints

The adult human body usually has 206 bones, and except for the hyoid bone in the neck, each bone is connected to at least one other bone. Joints are the location where bones come together. Many joints allow for movement between the bones. At these joints, the articulating surfaces of the adjacent bones can move smoothly against each other. However, the bones of other joints may be joined by connective tissue or cartilage. These joints are designed for stability and provide little or no movement.

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.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...

Structural Joints: Synovial Joints

Structural Joints: Synovial Joints

Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...

Functional Classification of Joints

Functional Classification of Joints

Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An immobile...

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...

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...

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Related Experiment Video

Updated: May 9, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Published on: April 11, 2018

A graphical presentation of three-dimensional joint mobility.

S H Jones¹, M J Pearcy, P B Attewell

¹Bioengineering Research Group and the Applied Mechanics Group, School of Engineering and Applied Science, University of Durham, UK.

Clinical Biomechanics (Bristol, Avon)

|August 7, 2013

Summary

This summary is machine-generated.

A new hemispherical projection method effectively plots 3D joint mobility data, aiding clinical assessment of conditions like reduced joint mobility. This technique offers a novel way to quantify joint disability.

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Last Updated: May 9, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

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Area of Science:

Biomechanics
Medical Engineering
Orthopedics

Background:

Reduced joint mobility is a common condition resulting from trauma or joint disease.
Current methods for plotting three-dimensional joint rotations are unsatisfactory.
Existing graphical methods often exclude or require separate presentation of one rotational angle.

Purpose of the Study:

To introduce a novel technique for plotting three-dimensional joint mobility data.
To provide a method for straightforward comparison of joint movements between individuals and patient groups.
To enable quantification of joint disability through derived mobility indices.

Main Methods:

The hemispherical projection method, adapted from structural geology and rock mechanics, is proposed.
This technique is used for plotting and analyzing orientation information.
Microcomputer-based plotting of human hip and spine movement data was performed.

Main Results:

Successful plotting of three-dimensional human hip and spine movement data was achieved.
The output graphs provide a visual representation for comparing joint movements.
The potential for deriving 'indices of mobility' from these plots was demonstrated.

Conclusions:

The hemispherical projection method offers a superior approach to visualizing 3D joint mobility.
This technique can serve as a valuable clinical aid for assessing joint function and disability.
Derived indices of mobility may quantify joint disability based on plot characteristics like area and asymmetry.