Univers CA Heads are designed to articulate with what 2 surfaces?

Univers CA Heads are designed to articulate with what 2 surfaces?

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

Answer: (A)

In this design, the heads are meant to work with two bony surfaces in the shoulder region to reproduce how the joint moves and distributes loads. The glenoid cavity provides the socket for the ball, and the acromion acts as the second surface that the head can contact during motion. This pairing helps the prosthesis maintain alignment, accommodate a full range of motion, and manage contact stresses as the arm moves, especially in positions where the head would otherwise ride high against the superior shoulder region. While the glenoid is the primary articulation in a ball-and-socket shoulder joint, including the acromion as a secondary surface in this design aims to better mimic natural kinematics and reduce impingement or edge loading.

In this design, the heads are meant to work with two bony surfaces in the shoulder region to reproduce how the joint moves and distributes loads. The glenoid cavity provides the socket for the ball, and the acromion acts as the second surface that the head can contact during motion. This pairing helps the prosthesis maintain alignment, accommodate a full range of motion, and manage contact stresses as the arm moves, especially in positions where the head would otherwise ride high against the superior shoulder region. While the glenoid is the primary articulation in a ball-and-socket shoulder joint, including the acromion as a secondary surface in this design aims to better mimic natural kinematics and reduce impingement or edge loading.