Describe classification of joints with suitable example of each. 5 marks

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Classification of Joints

Joints (articulations) are sites where two or more skeletal elements come together. They are classified into two broad categories based on whether a cavity is present, and further subdivided structurally and functionally.

Two general categories of joints — synovial (with articular cavity) and solid (connected by connective tissue)

Fig. 1.20 — Gray's Anatomy for Students

I. Synovial Joints (Diarthroses)

Skeletal elements are separated by an articular cavity. These are the most mobile joints in the body.

Characteristic features:

Hyaline cartilage covers articulating surfaces
Joint capsule with an inner synovial membrane (produces synovial fluid for lubrication) and an outer fibrous membrane
May contain accessory structures: articular discs (fibrocartilage), fat pads, intra-articular tendons

Sub-types based on shape and movement:

Type	Movement	Example
Plane (gliding)	Sliding/gliding (uniaxial)	Acromioclavicular joint
Hinge	Flexion & extension only (uniaxial)	Elbow (humero-ulnar) joint
Pivot	Rotation around longitudinal axis (uniaxial)	Atlanto-axial joint (C1–C2)
Bicondylar	Mostly uniaxial + limited rotation	Knee joint
Condylar (Ellipsoid)	Flexion, extension, abduction, adduction, circumduction (biaxial)	Wrist joint
Saddle	Same as condylar; saddle-shaped surfaces (biaxial)	Carpometacarpal joint of thumb
Ball and Socket	All movements incl. rotation (multiaxial)	Hip joint, shoulder joint

Types of synovial joints — wrist (condylar), hip (ball & socket), elbow (hinge), saddle joint of thumb, atlanto-axial pivot joint

Fig. 1.22 — Specific types of synovial joints, Gray's Anatomy for Students

II. Solid Joints (Synarthroses / Amphiarthroses)

No articular cavity; bones are held together directly by connective tissue. Movement is restricted compared to synovial joints.

A. Fibrous Joints

Bones united by fibrous connective tissue.

Sub-type	Description	Example
Suture	Thin sutural ligament between bones; permits no movement	Coronal suture (skull)
Gomphosis	Periodontal ligament anchors tooth root in bony socket	Tooth in alveolar socket
Syndesmosis	Bones linked by a ligament or interosseous membrane; slight movement possible	Inferior tibiofibular joint; interosseous membrane between radius and ulna

B. Cartilaginous Joints

Bones united by cartilage.

Sub-type	Description	Example
Synchondrosis	Hyaline cartilage unites the bones; typically temporary (ossifies with age)	Epiphyseal (growth) plate; joint between first rib and sternum
Symphysis	Fibrocartilage pad between bones; slight movement allowed	Pubic symphysis; intervertebral discs

Summary Tree

Joints
├── Synovial (cavity present)
│   ├── Plane — acromioclavicular
│   ├── Hinge — elbow
│   ├── Pivot — atlanto-axial
│   ├── Bicondylar — knee
│   ├── Condylar — wrist
│   ├── Saddle — 1st carpometacarpal
│   └── Ball & Socket — hip
└── Solid (no cavity)
    ├── Fibrous
    │   ├── Suture — skull
    │   ├── Gomphosis — tooth socket
    │   └── Syndesmosis — tibiofibular
    └── Cartilaginous
        ├── Synchondrosis — epiphyseal plate
        └── Symphysis — pubic symphysis

Gray's Anatomy for Students, pp. 34–36

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