Which type of movable joint is Hip joint?

Appeared in: AIIMS Raipur NO- 2019 (shift 3rd)

Explanation

The hip joint is classified as a ball-and-socket (spheroidal) joint.
This type of joint is formed by a globular or spherical head of one bone (the 'ball', which is the head of the femur) fitting into a cup-shaped cavity of another bone (the 'socket', which is the acetabulum of the pelvis).
This anatomical structure allows for movement in multiple axes (multiaxial or polyaxial), including flexion, extension, abduction, adduction, and rotation.
The shoulder joint is another primary example of a ball-and-socket joint.

Option A: A saddle joint has reciprocally concavo-convex articular surfaces, resembling a saddle. This is different from the ball-in-cup structure of the hip.
Option B: A pivot joint allows only for rotation around a single longitudinal axis. The hip joint allows for a much wider range of motion.
Option D: A hinge joint permits movement in only one plane (uniaxial), primarily flexion and extension, like the hinge of a door. The hip joint is multiaxial.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of synovial joints as background academic context rather than a clinical decision trigger.
Understanding the hip joint's structure is crucial for assessing range of motion and diagnosing conditions like osteoarthritis, hip dysplasia, or fractures.
The ball-and-socket design, while allowing great mobility, is also susceptible to dislocation, especially from trauma. Nurses must be aware of positioning precautions after hip surgery to prevent this.
Total Hip Arthroplasty (THA) is a common surgical procedure where the diseased ball and socket are replaced with prosthetic components, aiming to restore pain-free movement.

How to Approach the Question

This is a factual recall question from anatomy.
First, identify the key term in the question: 'Hip joint'.
Recall the different classifications of movable (synovial) joints.
Visualize the structure of the hip: the round head of the femur fitting into the socket of the pelvis.
Match this 'ball in a socket' structure to the correct joint type from the options provided.
Eliminate the other options by recalling their characteristic shapes and movements (e.g., hinge for elbow, pivot for neck, saddle for thumb).

Concept Tested & Keywords

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E6 Osteology InderbirSingh 5e p. 24-26

E6 Anatomy Applied Ashalatha 4e p. 297-299

Practise the full AIIMS Raipur NO- 2019 (shift 3rd)

Attempt every question from this paper in a timed mock, then review the full solution for each one.