This study is designed to investigate whether iovera° treatment prior to TKA decreases cumulative participant opioid use over the course of 6 weeks following TKA while maintaining similar levels of pain relief. The study will also investigate whether there is a relationship between participants treated with iovera° and participant reported pain and function as measured by knee injury and osteoarthritis outcomes score (KOOS JR), numeric rating scale (NRS) for pain; use of hospital services post-TKA and improved physical rehabilitation as measured by range of motion.

Inclusion Criteria:

1. 22 to 79 years of age
2. Scheduled to undergo primary unilateral TKA under spinal anesthesia for primary diagnosis of osteoarthritis
3. Participant is a class I-III on the American Society of Anesthesiology (ASA) Physical Classification System
4. Anticipation of discharge to home after inpatient acute post-op phase based on age, co-morbidities, home environment, and social support are in favor of discharge to home in the opinion of the Investigator.
5. Participant is willing and able to give written informed consent.
6. Participant is fluent in verbal and written English.
7. Participant is willing and able to comply with study instructions and commit to all follow-up visits for the duration of the study.
8. Participant is in good general health and free of any systemic disease state or physical condition that might impair evaluation or which in the Investigator's opinion, exposes the participant to an unacceptable risk by study participation.

Exclusion Criteria:

1. Chronic opioid use (defined as daily or almost daily use of opioids for >3 months).
2. Concurrent painful physical condition, surgery, or musculoskeletal disease that requires analgesic treatment during study follow-up that is not strictly related to the target knee being treated with iovera°, which have the potential to confound the postoperative assessments (e.g., significant pain from other joints, chronic neuropathic pain, concurrent or planned contralateral TKA, concurrent foot, neck, spine, hip, or other musculoskeletal disease, arthritis, or planned surgery, etc.).
3. Greater than 15° malalignment (varus or valgus) on pre-operative radiograph.
4. Previous Myoscience treatment.
5. Previous Partial or Total Knee Arthroplasty. Partial or Total Knee Arthroplasty of the contralateral knee is permitted if surgery was completed at least nine (9) months prior to Screening.
6. Body Mass Index ≥ 40
7. Prior surgery in the treatment areas that may alter the anatomy of the infrapatellar branch of the saphenous nerve (ISN) or the anterior femoral cutaneous nerve (AFCN) or result in scar tissue in the treatment area.
8. Any clotting disorder and/or use of an anticoagulant (e.g. warfarin, clopidogrel, etc.) within seven (7) days prior to administration of the device. Low dose aspirin (81mg or less daily) for cardiac prophylaxis allowed.
9. Any local skin condition at the treatment sites that in the Investigator's opinion would adversely affect treatment or outcomes.
10. Open and/or infected wound in the treatment areas.
11. Allergy to lidocaine.
12. History of cryoglobulinemia
13. History of paroxysmal cold hemoglobinuria.
14. History of cold urticaria.
15. History of Raynaud's disease.
16. History of opioid or alcohol abuse.
17. Participant is pregnant or planning to become pregnant while enrolled in the study.
18. Current enrollment in any investigational drug or device study or participation within 30 days prior to screening.
19. Currently being treated for related knee injury under worker's compensation claim or equivalent (i.e. legal case).
20. Any chronic medical condition that in the Investigator's opinion would prevent adequate participation.
21. Any chronic medication use (prescription, over-the-counter, etc.) that in the Investigator's opinion would affect study participation or participant safety.
22. For any reason, in the opinion of the Investigator, the participant may not be a suitable candidate for study participation (i.e., history of noncompliance, drug dependency, etc.).

Intent-to-Treat (ITT) population included all participants who were randomized into the study.

From first treatment up to the end of the study (Up to approximately 12 weeks)

All-cause Mortality: ITT population included all randomized participants. Serious Adverse Events and Adverse Events: Safety population included all participants who received study treatment.

This study was acquired from another sponsor. Results for the Primary Outcome Measure, Cumulative Opioid Consumption, are reported for the Time Frame (From the time of TKA surgery to 6 weeks post-TKA surgery) because the results for the Time Frame (From the time of hospital discharge to 6 weeks post-TKA surgery) are not available.