Which surfaces are the Univers CA Heads designed to articulate with?

Which surfaces are the Univers CA Heads designed to articulate with?

• A. Glenoid and Acromion
• B. Humeral head and Glenoid
• C. Acromion and Clavicle
• D. Scapula and Humeral head

Answer: (A)

Univers CA Heads are built to work with two specific bony surfaces in the shoulder region: the glenoid fossa and the acromion. The glenoid provides the socket that the prosthetic head sits against, while the acromion forms the superior boundary that helps guide and stabilize the head within the joint. This pairing supports the intended motion and stability of the constrained articulation. The other pairings—clavicle with acromion (AC joint), or the humeral head with the glenoid, or scapula with the humeral head in isolation—do not match the design intent of this head, which is to interact with the glenoid and the acromion surfaces.

Univers CA Heads are built to work with two specific bony surfaces in the shoulder region: the glenoid fossa and the acromion. The glenoid provides the socket that the prosthetic head sits against, while the acromion forms the superior boundary that helps guide and stabilize the head within the joint. This pairing supports the intended motion and stability of the constrained articulation. The other pairings—clavicle with acromion (AC joint), or the humeral head with the glenoid, or scapula with the humeral head in isolation—do not match the design intent of this head, which is to interact with the glenoid and the acromion surfaces.