Investigator medical practice didn't allow to move forward with the study.

The functional flexion axis of the knee can be established by computer-assisted intra-operative data, through range of motion techniques, not specific landmarks such as epicondyles.

Inclusion Criteria:

• Males and Females over the age of 18 and equal to or less than the age of 60
• Patients scheduled for elective Total knee arthroplasty surgery
• Patients who have signed informed consent and HIPAA Authorization
• Able to speak and understand English

Exclusion Criteria:

• Patients presenting with evidence of recent trauma, active infection, chronic pain syndrome of the spine, dementia or have been diagnosed with Alzheimer's disease
• Pregnant women
• Patients that will not sign the informed consent