In Vivo Determination of 3D Patellofemoral Mechanics

Inclusion Criteria

• •1. Patients must be at least six months post-operative.
• •2. Potential subjects will have a body weight of less than 250 lbs.
• •3. Candidates must have an AKS score \>70 post-operatively.
• •4. Patients must have passive flexion of at least 100.
• •5. Implanted group must have either an LCS PS RP TKA, having an anatomical patella, or Sigma PS RP TKA; or normal knee group must have normal knee.
• •6. Must be willing to sign both Informed Consent and HIPAA forms.