Difficulties getting subjects recruited and enrolled.

32 patients with Eaton-Glickel stage 2-3 CMC arthritis will be randomized to receive intraarticular MFAT or intraarticular corticosteroid injection. Patients with inflammatory arthritis or prior thumb base trauma or surgery will be excluded. Autologous adipose tissue will be harvested from the outer thigh or lower abdomen using local anesthesia. Tissue will be processed to remove oil and debris in-office using an FDA-approved commercially available device. The processed adipose will be immediately injected into the thumb CMC joint under fluoroscopic guidance. Visual analogue score (VAS), grip/pinch strength, Kapandji range of motion score, thumb disability examination, and QuickDASH score will be assessed pre-procedure and at 2 weeks, 6 weeks, 3 months, 6 months, and 12 months.

Inclusion Criteria:

1. 18 years old or older; male and female patients
2. Eaton-Glickel stage 2-3 thumb CMC arthritis
3. Failed conservative treatment (i.e. hand therapy, pain medications, splinting)
4. Able to provide informed consent

Exclusion Criteria:

1. Pregnancy/breastfeeding
2. Inflammatory or posttraumatic arthritis
3. Prior thumb base trauma or surgery
4. Evidence of skin infection or soft tissue loss at the thumb CMC joint or adipose harvest site
5. Active local or systemic malignancy
6. Known allergy to any study drug

Individual participant data that underlie the results reported in this article, after deidentification (text, tables, figures, and appendices) upon reasonable request.

Beginning 9 months and ending 36 months following article publication or as required by a condition of awards and agreements supporting the research.

The investigator who proposed to use the data upon reasonable request. Requests should be directed to Jacques.Hacquebord@nyulangone.org. To gain access, data requestors will need to sign a data access agreement.