Total knee arthroplasty (TKA) prostheses are semi-constrained artificial joints. A particular prosthesis design should have a level of femorotibial constraint that matches the device’s clinical indication. For example, a cruciate retaining (CR) TKA prosthesis is indicated for patients who have a fully functioning posterior cruciate ligament (PCL), while a CR-Constrained (CRC) prosthesis that compensates for PCL function by increasing sagittal conformity to offer additional anterior stability might be indicated for those who do not.

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