What feature in the OR3O construct allows for proper insertion of the Oxinium Liner into the acetabular cup?

• A. Locking Ring
• B. Guided Lip
• C. Alignment Peg
• D. Self-sealing Valve

Answer: (C)

The key idea is how the liner is guided into the cup so it sits exactly where it should. The alignment peg provides a precise interlock between the Oxinium liner and the acetabular cup, so when you insert the liner, it can only seat in the correct rotational position and depth. That matching peg-and-recess interface prevents misorientation, ensures the liner lines up with the shell’s locking features, and allows the locking mechanism to engage reliably. The other features have related roles—like aiding engagement or securing the liner once it’s aligned—but they don’t establish the correct orientation during insertion the way the alignment peg does.