Example of ball and socket joint is?

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2015

Explanation

The hip joint is a classic example of a ball-and-socket (spheroidal) synovial joint.
In this joint, the spherical head of the femur (the 'ball') articulates with the cup-shaped acetabulum of the pelvis (the 'socket').
This structure allows for multiaxial movement, providing the widest range of motion, including flexion, extension, abduction, adduction, and rotation.

Option A: The elbow is a hinge joint, which is uniaxial and only permits movement in one plane (flexion and extension).
Option C: This option includes multiple joint types. The carpometacarpal joint of the thumb is a saddle joint, and the metacarpophalangeal joints of the fingers are condyloid joints.
Option D: The joints between the carpal bones of the wrist are plane (or gliding) joints, which allow for limited sliding movements.

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.
Nurses must understand joint types to perform accurate Range of Motion (ROM) assessments. For a ball-and-socket joint like the hip, assessment includes all planes of movement: flexion, extension, abduction, adduction, and internal/external rotation.
What if? If a patient has undergone a total hip replacement, the nurse's priority shifts to enforcing movement restrictions. Certain movements, like adduction past the body's midline or excessive internal rotation, are prohibited to prevent the prosthetic 'ball' from dislocating from its 'socket'.

How to Approach the Question

This is a factual recall question that tests knowledge of anatomy.
First, clearly define the key term in the question: 'ball-and-socket joint'. Recall its key feature: a spherical head fitting into a cup-like socket, allowing for multiaxial movement.
Next, evaluate each option against this definition.
Option A (Elbow): Recall this is a hinge joint (flexion/extension only). Eliminate.
Option B (Hip joint): Recall this is a primary example of a ball-and-socket joint. This is a strong candidate.
Option C (Thumb/fingers): Recall the thumb is a saddle joint and fingers are condyloid. Eliminate.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 4 p. 137-139

E6 Nursing Fundamentals Taylor p. 305-307

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