Inclusion Criteria:  Eaton-Glickel >2 arhritis Symptom duration >3 months Pain VAS >30mm No significant comorbidities, ASA I-II Fluent in Finnish language  Exclusion Criteria:  Eaton-Glickel <2 Duration of symptoms <3 months VAS <30mm ASA >II Inflammatory joint disease Systemic corticosteroid or immunomodulatory medication Upper limb symptoms not explained with CMC I artritis Heavy smoking (> 20 cigarettes per day) Alcohol or drug abuse Neurological condition affecting upper limb function Other ipsilateral upper limb condition requiring surgery