Rationale: CBD is commonly being used as an over-the-counter treatment for arthritis-related pain, however no clinical trial has been performed to establish efficacy. Hypothesis: CBD is more effective than placebo for relieving pain and improving patient-reported outcomes for thumb basal joint arthritis. Study Design: The study design with be a double-blind, randomized controlled trial with crossover. Treatment will be blinded to the subjects and investigators. Patients will be randomly assigned 2 weeks of the CBD or control and then crossover to the other condition for 2 additional weeks. Patients will apply the cream at the thumb base twice daily for 1 hour. Subjects will be advised to observe for physiologic changes, skin changes, or other adverse effects.
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Change in Hand Strength During Intervention and at Follow-up.
Timeframe: Change from baseline to 2 weeks
Change in the PROMIS Upper Extremity Tests During Intervention and at Follow-up.
Timeframe: Change from baseline to 2 weeks
Change in Kapandji Score
Timeframe: Change from baseline to 2 weeks
Change in Hand Range of Motion
Timeframe: Change from baseline to 2 weeks