Subjects who are candidates for a total knee replacement and meet the inclusion/exclusion criteria of the study.

Used for primary total knee replacement

The Knee Society Score includes a knee rating and function score. This evaluation covers the knee rating score with three main parameters of pain, stability and range of motion and that flexion contracture, extension lag and misalignment should be dealt with as deductions. Thus, 100 points will be obtained by a well-aligned knee with no pain, 125 degrees of motion, and negligible anteroposterior and mediolateral instability. 50 points are allotted for pain, 25 for stability, and 25 for range of motion. Grading for KS Score: Excellent (90-100), Good (80-90), Fair (70-79) and Poor (<70).

The patient function score considers only walking distance and stair climbing, with deductions for walking aids. The maximum function score is obtained by a patient who can walk an unlimited distance and go up and down stairs normally. Walking ability is expressed in blocks (approximately 100 meters). Stair climbing is considered normal if the patient can ascend and descend stairs without holding a railing. A score of > or = to 60 on the function score is considered success. Minimum score = 0, maximum score = 100 with the higher the score representing a better outcome.

The maximum score for each of the sections is 100 points. A score of at least 80 points on the 2-year knee assessment score was defined as a success.

Subjects who meet the inclusion/exclusion criteria and are treated and receive the Mobile Bearing Knee. The Encore Mobile Bearing Knee is intended for subjects presenting for a primary cemented knee replacement suffering from inflammatory tissue disorders, osteoarthritis, post-traumatic arthritis, secondary arthritis, or avascular necrosis of the femoral condyles. This design is indicated for subjects who have adequate, as judged by the physician, collateral ligamentous stability to support the implant.

The Knee Society Score includes a knee rating and function score. This evaluation covers the knee rating score with three main parameters of pain, stability and range of motion and that flexion contracture, extension lag and misalignment should be dealt with as deductions. Thus, 100 points will be obtained by a well-aligned knee with no pain, 125 degrees of motion, and negligible anteroposterior and mediolateral instability. 50 points are allotted for pain, 25 for stability, and 25 for range of motion. Grading for KS Score: Excellent (90-100), Good (80-90), Fair (70-79) and Poor (<70).

Out of the 282 subjects who completed the study, only 173 were analyzed due to either the 2 year visit being completed out of window or missing data.

Subjects who meet the inclusion/exclusion criteria and are treated and receive the Mobile Bearing Knee. The Encore Mobile Bearing Knee is intended for subjects presenting for a primary cemented knee replacement suffering from inflammatory tissue disorders, osteoarthritis, post-traumatic arthritis, secondary arthritis, or avascular necrosis of the femoral condyles. This design is indicated for subjects who have adequate, as judged by the physician, collateral ligamentous stability to support the implant.