Patients with thumb CMC OA will be recruited at Tecan Hand Center Clinic. Participants will be assigned using a randomized allocation in two groups. For group A a "Whale orthotic" will be constructed and for group B a Colditz orthotic. Both static splint will endorse for 3 months. Inclusion criteria for this study were adult over 18 diagnosed with carpometacarpal joint osteoarthritis with a pain intensity during Activities of Daily Living (ADL's) up to 4 / 10 on the Visual Analog Scale (VAS).