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.
Which type of total knee arthroplasty (TKA) implant retains the posterior cruciate ligament (PCL)?
What is the primary indication for total knee arthroplasty (TKA)?
What is the main advantage of a rotating platform (mobile-bearing) TKA implant?
In which situation is a constrained condylar (CCK) implant typically indicated?
What is the recommended principle for selecting TKA implants regarding constraint?
Which alignment strategy in TKA focuses on replicating the native pre-arthritic joint line?
What is the typical 10-year survivorship for well-fixed, well-aligned TKA implants?
What is the primary role of the central tibial post in a posterior-stabilised (PS) TKA implant?
Which of the following is an absolute contraindication for total knee arthroplasty?
What scoring system is commonly used in the UK to evaluate outcomes of TKA?
