Rhizarthosis can be treated by prothesis of the carpo-metacarpal (CM) joint of the thumb. But, if the scaphotrapeziotrapezoid (STT) joint is also affected by arthrosis, treating the CM joint exclusively may result in partial pain relief. Thus, bone scintigraphy could identify early arthrosis of the STT joint when its appearance seems to be normal on planar radiography, suggesting another surgical procedure.

Inclusion Criteria:

• failure of medical treatment of rhizarthrosis
• eligibility for prothesis
• no osteoarthritis of the STT joint on planar radiography
• no opposition from the patient

Exclusion Criteria:

• Refusal by a patient

patient who beneficiate of a bone scintigraphy before arthroplasty for rhizarthrosis with failure medical treatment, without osteoarthritis of the STT joint on planar radiography

All collected data that underlie results in a publication

Data will be available after the publication of result and ending five years maximum following the last visit of the last patient

Data access requests will be reviewed by the internal committee of Brest UH. requestors will be required to sign and complete a data access agreement