The purpose of the study is to determine the clinical outcomes and survivorship of robotic-arm assisted medial bicompartmental knee arthroplasty at two, five, seven and ten years postoperative.

The purpose of the study is to determine the survivorship, patient satisfaction and clinical outcomes of robotic-arm assisted medial bicompartmental knee arthroplasty using the MCK implant system starting at two years post-operative and continuing for five, seven and ten years post-operative.

Inclusion Criteria:

• All patients over 21 years of age who underwent robotic-arm assisted medial bicompartmental arthroplasty by the investigating surgeon and received MCK implants and are at least 24 months post-operative.
• Patient has signed an IRB approved Informed Consent Form or with IRB approved waiver of written signed consent, patient has verbally consented to study participation.
• Patient is willing to comply with follow up

Exclusion Criteria:

• Patients will be excluded from participation in the study if they are cognitively unable to answer questions related to their index procedure and health quality of life forms.
• Patient had active infection
• Implants were implanted without bone cement
• Patients did not have sufficient bone stock to allow for insertion and fixation of components
• Patient did not have sufficient soft tissue integrity to allow for stability
• Patient had a neurological or muscular deformity that did not allow for control of the knee.

All patients over 21 years of age who require a primary robotic-arm assisted medial bicompartmental arthroplasty.