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bones involved in this joint are the scaphoid, lunate, and triquetrum. The ulna, the other bone in the forearm, is not directly involved in the joint but

of the head of the radius and the ring formed by the radial notch of the ulna and the annular ligament. Stewart, M., Hacking, C. Proximal radioulnar joint

existing between the ulnar notch of the distal radius and the head of the ulna. The primary uniting structure of the joint is the articular disc of the

stub. Expose both limbs to the elbow All aspects Don’t forget forearm or ulna aspects Seated, hands on pillow or desk Posture/alignment Tremor Swelling

ligament, which holds it in place as it articulates with the radial notch of the ulna, which permits pronation and supination. This section is original unported

bones: the ulna, medially, and the radius, laterally. Bridging the ulna and radius is an interosseous membrane that transmits forces from ulna to radius

to the ulna from the carpus, much like the way the meniscus of the knee receives and distributes force from the femur. Without a TFCC, the ulna is only

world (Boston, for example) pronounce the words “ulna” and “ulnar” indistinguishably, the word “ulna” refers to the bone itself and the word “ulnar” is

angulated 30° along the long axis of the humerus. The articular surface of the ulna is oriented in approximately 4° to 7° of valgus angulation with respect to

There are eight carpal bones at the wrist, situated between the radius and ulna in the forearm and the metacarpals in the hand. The most common (and important)

Planar Joint Distal Radioulnar Joint Joint type: Pivot Joint Bones: Radius, Ulna Ligaments: Triangular, anterior distal radioulnar, and posterior distal radioulnar

Primary Type Synovial Joint Secondary Type Hinge Joint Bones Humerus, Radius, Ulna Ligaments Capsule, medial and lateral collateral ligaments, oblique cord

are categorised as intrinsic (carpal to carpal) and extrinsic (radius or ulna to carpal). Intrinsic Ligaments The interosseous ligaments connect the carpal

carpal bones. The scaphoid links the carpal bones closest to the radius and ulna, the so-called the “proximal row,” to those articulating with the metacarpals

extension); it also articulates with the distal ulna (creating a joint for pronation and supination). The distal ulna attaches to a meniscus-like structure, the

Transverse section across distal ends of radius and ulna.

The radial head articulates with both the capitellum of the humerus and the ulna. The radial head is concave, matching the convex surface of the capitellum

case of a “both bones” fracture of the forearm, where both the radius and ulna must be treated to restore rotation function, specific treatment of the fibular

Bones Ligaments Muscles Innervation Vasculature ROM Volume Elbow Joint Radius Ulna Humerus Capsule, medial and lateral collateral ligaments, oblique cord, quadrate

children, but usually does not happen again after the age of 5. The radius and ulna form a ring in the forearm that transmits forces from the wrist to the elbow

digital arteries from the superficial palmar arch Radiocarpal Joint Radius Ulna Scaphoid Lunate Triquetrum Volar: radial collateral ligament to styloid process

disease: head of the radius Buchman disease: iliac crest Burns disease: distal ulna Caffey disease: entire carpus or intercondylar spines of the tibia Dias disease:

development of Kienböck’s disease. Negative ulnar variance (Figure 2), in which the ulna is short relative to the radius, is believed to be a risk factor. Repetitive

trochlea -- a smooth spool of articular cartilage clasped by the proximal ulna to form the humeral side of the elbow’s hinge mechanism. The distal part

radial notch of the ulna and spins with respect to the lateral humeral condyle. Distally, the radius glides with respect to the ulna at the distal radioulnar

(False) Rib 11 (Floating) Rib 12 (Floating) Scapula Clavicle Humerus Radius Ulna Scaphoid Lunate Triquetrum Pisiform Hamate Capitate Trapezoid Trapezium Metacarpal

Planar Joint Distal Radioulnar Joint Joint type: Pivot Joint Bones: Radius, Ulna Ligaments: Triangular, anterior distal radioulnar, and posterior distal radioulnar

with the Content or Container. Shape of the carpal bones and distal radius-ulna Joint abnormalities: joint subluxations, wrist arthrosis, inflammatory arthritis