Stryker NTX Registry Scorpio NRG (Re-"Energize"), Triathlon Total Knee, Triathlon Partial Knee Resurfacing (PKR) With X3 Polyethylene Insert

Stryker NTX Registry Scorpio NRG Triathlon Total Knee, Triathlon PKR With X3 Insert International Multicentre Outcomes Register

Provide outcomes information with regard to surgical and implant performance and patient clinical outcomes of the patients who are eligible for either a Total Knee Arthroplasty (TKA) replacement surgery or Partial Knee Resurfacing (unicompartmental knee arthroplasty, UKA)

The objective of this registry is to provide outcomes information with regard to surgical and implant performance and patient clinical outcomes of the patients who are eligible for a either a Total Knee Arthroplasty (TKA) replacement surgery involving the Scorpio NRG or Triathlon Total Knee System or Triathlon PKR Partial Knee Resurfacing (unicompartmental knee arthroplasty, UKA), all of which with X3 inlay. The register will follow the standard clinical procedures used by the institutions for patient selection for knee arthroplasty surgery, patient surgery and patient follow-up. Therefore there will be, with regard to this register, no additional assessment, examination, procedure or follow-up visits compared to those usually performed in the institution (routine standard normal procedures).

Inclusion Criteria:

1. Patients requiring primary TKA, suitable for the use of the Scorpio NRG with X3 insert or Triathlon Total Knee System with X3 insert, or, patients requiring partial knee resurfacing (unicompartmental knee) suitable for the use of the Triathlon PKR (Partial Knee Resurfacing) System with X3 insert
2. Patients who understand the conditions of the outcomes registry and are willing and able to comply with the standard post-operative evaluations and the prescribed rehabilitation.
3. Patients who signed the Informed Consent Form (approved by Ethics Committee if required) prior to surgery.

Exclusion Criteria:

• None