Elbow Joint Anatomy: Hinge Structure and Movements

Steps:

• Identify the elbow as a synovial hinge joint formed by humerus, radius, and ulna, primarily allowing flexion and extension.
• Confirm statement 1: It is a hinge joint (correct, ginglymus type).
• Evaluate statement 2: It permits rotation (incorrect, rotation occurs at radioulnar joints but not the humeroulnar hinge).
• Confirm statement 3: It has a carrying angle for arm positioning (correct, valgus alignment in extension).

Why C is correct:

• C selects statements 1 and 3, matching the hinge nature and anatomical features without including the false rotation claim.

Why the others are wrong:

• A includes all three, but 2 is false as hinge joints limit rotation.
• B omits 3, ignoring the established carrying angle.
• D excludes 1, misrepresenting the joint's primary classification.

Final answer: C