During revision total knee arthroplasty for aseptic loosening, the medial collateral ligament is found to be attenuated and non-functional, with significant medial bone loss. The most appropriate implant choice is:
- A Posterior-stabilized condylar prosthesis
- B Constrained condylar knee (CCK) prosthesis ✓
- C Unicompartmental knee arthroplasty
- D Cruciate-retaining prosthesis
Correct answer: B. Constrained condylar knee (CCK) prosthesis
Explanation
When collateral ligament insufficiency is present in revision TKA, a constrained condylar knee prosthesis provides varus-valgus stability through a tall tibial post and wide central box that engage with the femoral stem. A rotating hinge prosthesis would be indicated for complete collateral deficiency with significant bone loss requiring medial/lateral constraint. CCK balances constraint with bone preservation.
Reference: Insall and Scott Surgery of the Knee, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.