The purpose of this study is to correlate functional outcomes and perioperative complications with tourniquet use during total knee arthroplasty.

Inclusion Criteria:

1. All unilateral primary knee arthroplasties performed by investigators participating in this study will be eligible for inclusion
2. Diagnosis of osteoarthritis

Exclusion Criteria:

1. Revision surgery
2. Bilateral knee surgery
3. Age <18 or >80
4. BMI >40
5. Baseline lower extremity strength less than 5/5
6. Vascular calcifications
7. History of chronic narcotic use, defined as more than 5mg of oxycodone q4 hours
8. Functionally limiting spine disease
9. Other functionally limiting lower extremity disorder (i.e. symptomatic ipsilateral hip disease)
10. Patients who cannot perform the baseline functional tests
11. Allergy/contraindication to protocol medications
12. Post-traumatic arthritis
13. Inflammatory arthritis
14. Pregnancy
15. Prisoners
16. Patients receiving care as part of a worker's compensable injury