In modern total hip arthroplasty, which bearing couple has the LOWEST wear rate and is preferred in young active patients, but carries the unique risk of 'squeaking'?
- A Metal-on-polyethylene
- B Ceramic-on-polyethylene
- C Ceramic-on-ceramic ✓
- D Metal-on-metal
Correct answer: C. Ceramic-on-ceramic
Explanation
Ceramic-on-ceramic (CoC) bearings have the lowest volumetric wear rate of all available couples and are therefore preferred in young, active patients to minimize osteolysis. However, CoC constructs carry the recognized complication of audible 'squeaking' during gait, thought to arise from stripe wear and loss of fluid film lubrication, occurring in approximately 1–3% of cases. Metal-on-metal fell out of favor due to adverse local tissue reactions from cobalt-chrome ions.
Reference: Maheshwari Essential Orthopaedics, 6th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.