Basal joint arthritis, or arthritis of the thumb carpometacarpal joint, is a common condition affecting women in particular. It has multiple treatment options depending on the stage of arthritis. For early stage arthritis with instability, volar ligament reconstruction is recommended. For more advanced arthritis, options include ligament reconstruction with tendon interposition, trapezium excision with tendon interposition, or arthrodesis (fusion) of the joint, with the choice depending on patient age, demands, and severity of arthritis. Surgical treatment aims to relieve pain while maintaining function and stability.