During cementless total hip arthroplasty, the acetabular component is impacted into a reamed socket that is 1 mm undersized relative to the implant. What term describes this fixation principle?
- A Oseointegration
- B Friction-fit stabilisation
- C Press-fit interference ✓
- D Cement interdigitation
Correct answer: C. Press-fit interference
Explanation
A component inserted into a slightly smaller reamed bed (typically 1 to 2 mm under-ream) creates elastic recoil of the bone against the implant, termed press-fit interference. This provides initial stability upon which secondary biological fixation via osseointegration occurs later. Cement interdigitation applies only to cemented components.
Reference: Campbell's Operative Orthopaedics, 14th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.