Fluoroscopic Analysis of Total Knee Replacement With a Kinematic Retaining or a Posterior Stabilized Design

Inclusion criteria

• Patients submitted to Total knee arthroplasty (TKA) with Physica KR or PS;
• Patients with an appropriate initial fixation and stability of the knee prosthesis;
• Patients achieving a minimum flexion of 100° or a Knee Society Score (KSS) ≥ 65 (fair/good postoperative outcome) at 6-month follow-up;
• Patients affected by primary or secondary Osteoarthritis (OA) before surgery;
• Patients who understand the requirements of the study and are willing and able to comply with activities required for fluoroscopic examination;
• Patients who have signed the Ethics Committee approved study-specific Informed Consent Form.

Exclusion criteria

• Patients with misalignment or axial malrotation of the knee prosthesis;
• Patients not able to achieve a minimum flexion of 100° or with a KSS Knee Score ≤ 65 points at 6-month follow-up;
• Patients who had or have planned a surgery on their uninvolved knee within a year;
• Muscular insufficiency or absence of muscololigamentous supporting structures required for adequate soft tissue balance;
• Patients who have significant neurological or musculoskeletal disorders or disease that may adversely affect gait and compromise functional recovery and evaluation;
• Patients who have neuromuscular or neurosensory deficit which would limit the ability to assess the performance of the device;
• Any psychiatric illness that would prevent comprehension of the details and nature of the study;
• Participation in any experimental drug/device study within the 6 months prior to the screening visit
• Female patients who are pregnant, nursing, or planning a pregnancy due to x-rays exposition.