Total Knee Arthroplasty (TKA) — Implant Designs
Implants classified by degree of constraint: CR (least) → PS → CCK → Hinged (most). CR retains PCL; PS substitutes with cam-post. Constrained implants indicated for instability or major deformity. Mobile-bearing vs fixed-bearing — theoretical wear reduction, but long-term benefit unclear. Principle: use minimum constraint required.
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1Practised by MCQ
10Which type of total knee arthroplasty (TKA) implant retains the posterior cruciate ligament (PCL)?
mcqWhat is the primary indication for total knee arthroplasty (TKA)?
mcqWhat is the main advantage of a rotating platform (mobile-bearing) TKA implant?
mcqIn which situation is a constrained condylar (CCK) implant typically indicated?
mcqWhat is the recommended principle for selecting TKA implants regarding constraint?
mcqWhich alignment strategy in TKA focuses on replicating the native pre-arthritic joint line?
mcqWhat is the typical 10-year survivorship for well-fixed, well-aligned TKA implants?
mcqWhat is the primary role of the central tibial post in a posterior-stabilised (PS) TKA implant?
mcqWhich of the following is an absolute contraindication for total knee arthroplasty?
mcqWhat scoring system is commonly used in the UK to evaluate outcomes of TKA?