Elbow is a hinge joint with loose capsule and collateral ligaments. Initial imaging starts with radiographs showing sail sign. MRI sequences include coronal, axial, sagittal T1-weighted and T2-weighted sequences
Radius and ulna are two bones of the forearm, connecting to humerus at elbow. Radius is larger and longer than ulna, located on inner forearm side. Elbow tip is actually ulna bone tip. Radius and ulna rotate during pronation, forming crossed appearance
The radius is a long bone located in the forearm, extending from elbow to wrist. It forms four joints: elbow, proximal radioulnar, wrist, and distal radioulnar. The bone consists of proximal epiphysis, shaft, and distal epiphysis
Palmar plates reinforce MCP and IP joints in hand. Fibrocartilaginous structure attached to phalanx base. Provides stability to longitudinal palmar arches
Extrinsic hand muscle that abducts thumb at wrist. Forms anterior border of anatomical snuffbox. Originates from ulna, radius, and interosseous membrane. Innervated by posterior interosseous nerve from C7-C8. Supplied by posterior interosseous artery
Saddle joint is a synovial joint with reciprocally concave and convex surfaces. One bone surface is concave while another is convex. Creates significant stability