At least three (3) months post-operative with no other surgical procedures conducted within the past six months

Between 30-80 years of age

Body weight of less than 280 lbs

Must be between 160cm (5'3) and 193cm (6'4) tall

Body Mass Index (BMI) \>18.5 and \<35

Judged clinically successful with a Knee Society score (KSS) of greater than 80

Have good-to-excellent post-operative passive flexion with no ligamentous laxity or pain

Must be able to walk on level ground without aid of any kind, perform a ramp descent, and a deep knee bend (DKB), all without assistance

Will have a DePuy Attune PS TKA

Must be willing to sign the Informed Consent (IC) and HIPAA forms to participate in the study

Kinematic Analysis: Posterior Stabilized, Fixed Bearing Total Knee Arthroplasty With Attune Knee System