Gliding (Plane) Joints

1. Overview

Gliding joints, also called plane joints, are a type of synovial joint characterized by flat or slightly curved articular surfaces that slide past one another. These joints permit limited, non-axial movements, including small degrees of gliding or translation. While they do not allow for rotation or large angular motion, their contribution to joint flexibility, shock absorption, and overall body movement is essential, especially in areas requiring subtle coordination and support.

2. Location

Gliding joints are found in multiple regions of the body, especially where bones need to slide across each other for flexibility:

• Wrist: Between the carpal bones (intercarpal joints).

• Foot: Between the tarsal bones (intertarsal joints).

• Vertebral column: Zygapophyseal (facet) joints between the articular processes of adjacent vertebrae.

• Sternocostal joint: Between the sternum and costal cartilages (except the first rib).

• Acromioclavicular joint: Between the acromion of the scapula and the clavicle.

3. Structure

Gliding joints are simple in anatomy but structurally adapted for small, controlled motion:

• Articular surfaces: Flat or slightly curved surfaces covered by articular cartilage.

• Synovial capsule: Encloses the joint space and secretes synovial fluid for lubrication.

• Ligaments: Extrinsic and intrinsic ligaments stabilize the joint, restricting excessive motion.

• Joint cavity: Contains synovial fluid which reduces friction and nourishes the cartilage.

4. Function

The primary function of gliding joints is to allow small, multidirectional movements:

• Sliding and gliding: Bones slide past one another in multiple directions without angular movement.

• Support mobility: Facilitate the fine-tuning of joint position and support larger joint complexes (e.g., the wrist or spine).

• Distribute load: Help in spreading out mechanical forces across joint surfaces, reducing wear and tear.

5. Physiological role(s)

Although their movement range is small, gliding joints are crucial in overall musculoskeletal physiology:

• Coordination: Contribute to the fine coordination of hand and foot movements.

• Spinal flexibility: Facet joints enable slight movements between vertebrae that collectively result in spine flexion, extension, and rotation.

• Shock absorption: Allow subtle shifting and movement to dissipate forces during impact or weight bearing.

• Stability enhancement: Maintain alignment and joint congruency under stress through constrained sliding motions.

6. Clinical Significance

Several disorders and injuries may affect gliding joints due to their structural and mechanical roles:

• Osteoarthritis:

  • Degeneration of cartilage in gliding joints (e.g., facet joints or wrist) can lead to stiffness, pain, and reduced motion.

• Facet joint syndrome:

  • Inflammation or degeneration of spinal gliding joints results in localized back pain, often exacerbated by extension or twisting.

• Joint instability:

  • Ligament laxity can cause excessive gliding motion, potentially leading to joint subluxation or dysfunction.

• Subluxation in the wrist or foot:

  • Disruption of gliding joint alignment due to trauma can impair dexterity or gait and may require realignment or stabilization.

• Post-surgical fusion (arthrodesis):

  • In severe degeneration, gliding joints may be surgically fused to eliminate pain at the cost of mobility (common in spine or midfoot).