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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...

Structural Joints: Fibrous Joints

Structural Joints: Fibrous Joints

Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...

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...

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: Cartilaginous Joints

Structural Joints: Cartilaginous Joints

As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary or...

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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Related Experiment Video

Updated: May 15, 2026

Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography

Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography

Published on: October 6, 2023

["Floating interphalangeal joint". A case report].

M Aslan¹, F Duroux, O Delattre

¹Service de chirurgie orthopédique du membre supérieur, CHU Pierre-Zobda-Quitman, 97260 Fort-de-France, France. mad.aslan@laposte.net

Chirurgie De La Main

|January 1, 2013

Summary

This summary is machine-generated.

This case study details treating closed extra-articular phalangeal fractures of the thumb, resulting in a floating interphalangeal joint. A modified external fixator provided simple, economical, and effective fixation, leading to good functional and aesthetic outcomes.

Related Experiment Videos

Last Updated: May 15, 2026

Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography

Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography

Published on: October 6, 2023

Area of Science:

Orthopedic Surgery
Trauma Care

Background:

Direct trauma can cause complex phalangeal fractures, including those creating a floating interphalangeal joint.
The 2010 Haiti earthquake presented unique challenges for medical interventions.

Observation:

A patient sustained closed extra-articular phalangeal fractures of the thumb, forming a floating interphalangeal joint.
The injury resulted from direct trauma during the 2010 Haiti earthquake.

Findings:

Percutaneous external fixation using Martinique's "Ti'fix" (a modified Beaubourg fixator) was applied seven days post-trauma.
The fixation method was simple, economical, and improved quality, allowing for external fixator removal after one month.
Early mobilization post-fixator removal led to favorable functional and aesthetic results at one-year follow-up.

Implications:

This modified external fixation technique offers a viable solution for complex thumb phalangeal fractures in resource-limited settings.
Early mobilization following fixation is crucial for optimal functional recovery in phalangeal fractures.
The "Ti'fix" represents an improved, cost-effective approach to managing traumatic hand injuries.