as a result of Orthosensor's acquisition by Stryker in July 2018.No final mutually agreed (signed) protocol was found and no clear records of the study data can be retrieved. No accurate and reliable results of this study can be posted.

The primary objectives of this study are to understand the effects of soft-tissue balancing on Gait, function and rehabilitation potential after sensor-assisted Total Knee Arthroplasty and correlate Intra-operative subjective feel with OrthoSensor Outputs

Secondary objectives are to quantify and observe:

• Pain medication use
• Swelling
• Muscle strength and girth
• Gait efficiency
• Patient satisfaction
• Activity levels, functional return (i.e., back to work, resume normal activities)
• Patient perception of a balanced knee

Inclusion Criteria:

• Subject must be a candidate for a primary PCL retaining total knee arthroplasty
• Subject must be diagnosed with one or more of the following conditions: osteoarthritis, avascular necrosis, rheumatoid or other inflammatory arthritis, post-traumatic arthritis
• Subject is between the age of 45 - 80 years
• Subject is likely to be available for all study visits
• Subject is able and willing to sign the informed consent and follow study procedures

Exclusion Criteria:

• Prior total knee arthroplasty, ligament insufficiencies, prior surgeries such as ACL or PCL reconstructions, posterolateral reconstructions, osteotomies, tibia plateau fractures
• Range of Motion less than 90 degrees, flexion contracture of more than 20 degrees