A 78-year-old man with Parkinson's disease and recurrent posterior hip dislocations after primary THR, despite a 36 mm head and acceptable component position, undergoes revision. Which implant choice most effectively prevents further dislocation in this setting?
- A Dual mobility construct ✓
- B Lipped polyethylene liner with 40 mm head
- C Modular metal-on-metal bearing
- D Tripolar construct with constrained liner
Correct answer: A. Dual mobility construct
Explanation
Dual mobility constructs are the preferred option for recurrent instability with acceptable component positioning, especially in neuromuscular conditions, because they increase the effective head size and jump distance. Constrained liners are reserved as last resort because they transmit high forces to the bone-implant interface.
Reference: Campbell's Operative Orthopaedics, 14th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.