Which joint is most likely to be dislocated?
shoulder
knee
hip
elbow
The Correct Answer is A
Rationale:
A. The shoulder joint (glenohumeral joint) is the most mobile joint in the body, allowing a wide range of motion. Its shallow socket and relatively weak ligament support make it more susceptible to dislocation.
B. Knee is a strong hinge joint stabilized by ligaments and muscles, making dislocations less common than in the shoulder.
C. Hip is a deep ball-and-socket joint with strong ligaments and surrounding muscles, making dislocation rare except in severe trauma.
D. Elbow is a hinge joint with strong ligamentous support, so dislocations are less frequent compared to the shoulder.
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Related Questions
Correct Answer is B
Explanation
Rationale:
A. These joints are immovable (e.g., sutures of the skull) and do not allow versatility of movement.
B. Synovial joints are the most common type in the body and allow the greatest range of motion. They are characterized by a joint cavity filled with synovial fluid, articular cartilage, and a joint capsule. Examples include the shoulder, knee, hip, and fingers. These joints permit movements such as flexion, extension, rotation, abduction, and adduction, making them highly versatile.
C. These joints are held together by dense connective tissue and are mostly immovable (e.g., sutures, syndesmoses).
D. These joints are joined by cartilage (e.g., pubic symphysis, intervertebral discs) and allow only limited movement.
Correct Answer is B
Explanation
Rationale:
A. Rectus femoris is one of the quadriceps muscles located in the anterior thigh, important for knee extension and hip flexion.
B. Deltoid is the large, triangular-shaped muscle covering the shoulder joint, responsible for abduction, flexion, extension, and rotation of the arm. This matches the pictured muscle.
C. Diaphragm is the dome-shaped muscle that separates the thoracic and abdominal cavities, playing a primary role in respiration.
D. Dorsogluteal refers to a site in the gluteal region (buttocks) commonly used for intramuscular injections, not a specific muscle.
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