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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 Classification of Joints

Structural Classification of Joints

Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...

Joints

Joints

Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and stability, and can be classified based on their structure or function.
Structural joint classifications are based on the material that makes up the joint as well as whether or not the joint contains a space between the bones. Joints are structurally classified as fibrous, cartilaginous, or synovial.
Fibrous Joints Are Immovable
The bones of a...

Degenerative Disc Disease ll: Pathophysiology

Degenerative Disc Disease ll: Pathophysiology

The symptoms of degenerative disc disease arise from a combination of mechanical compression, vascular compromise, and biochemical inflammation, which together disrupt nerve function and produce pain.Mechanical CompressionDisc degeneration reduces height and elasticity, predisposing to herniation of the nucleus pulposus, a major cause of radicular pain. Herniations may be protrusion (bulging with intact annulus), extrusion (nucleus extends beyond disc but remains connected), or sequestration...

Classification of Bones

Classification of Bones

The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The long...

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...

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Related Experiment Video

Updated: Jun 2, 2026

Novel Diagnostics in Revision Arthroplasty: Implant Sonication and Multiplex Polymerase Chain Reaction

Novel Diagnostics in Revision Arthroplasty: Implant Sonication and Multiplex Polymerase Chain Reaction

Published on: December 3, 2017

[Joint endoprosthesis pathology. Histopathological diagnostics and classification].

V Krenn¹, L Morawietz, M Jakobs

¹Zentrum für Histologie, Zytologie und Molekulare Diagnostik Trier, Max-Planck-Str. 18 u. 20, 54296, Trier. krenn@patho-trier.de

|April 29, 2011

Summary

Understanding prosthesis failure is key to improving implant longevity. This classification system categorizes periprosthetic diseases, revealing how infection drastically reduces prosthesis durability.

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Area of Science:

Orthopedic Surgery
Biomaterials Science
Pathology

Background:

Prosthesis durability has improved, with high 10-year survival rates.
However, four main disease categories impact implant longevity: wear particle disease, infection, ossification, and arthrofibrosis.

Purpose of the Study:

To introduce and validate the histopathological "extended consensus classification of periprosthetic membranes."
To correlate membrane types with mean prosthesis durability (MPD).

Main Methods:

Histopathological analysis of periprosthetic membranes.
Classification into four neosynovial types (I-IV) and three arthrofibrosis grades.
Correlation of histopathological findings with clinical data and MPD.

Main Results:

Wear particle-induced (Type I) MPD: 12.0 years.
Infectious (Type II) MPD: 2.5 years.
Combined (Type III) MPD: 4.2 years.
Indeterminate (Type IV) MPD: 5.5 years.
Arthrofibrosis and osseous diseases can be diagnosed histopathologically or with clinical information.

Conclusions:

The extended consensus classification provides a framework for diagnosing periprosthetic diseases.
Infectious processes significantly compromise prosthesis durability.
This classification may serve as a foundation for a national endoprosthesis register.