Study of Medical Ultrasound for Rhizarthrosis

Inclusion Criteria: * Male and female patients aged 40 to 90 years * Pain intensity in the region of the thumb base in pain phases ≥ 40 mm on the VAS of 0 to 100 mm (relative to the last 24 hours) * Complaints for at least 3 months * X-ray Stadium Eaton I-IV at least once secured Exclusion Criteria: * History of surgery on the affected hand, wrist or forearm * Planned surgery in the next 8 months * Anticoagulation (Marcumar, Heparin) * Haemophilia, V. Willebrandt Jürgens syndrome, thrombocytopathy and other blood anomalies * acute pain medication (\<7 days) * Systemic medication with corticoids or immunosuppressants * Intraarterticular injections or RSO within the last 3 months * Pregnancy, lactation * Insulin-dependent type I diabetes mellitus * Significant cognitive impairment * clinically relevant or progressive disease (e.g., liver, kidney, cardiovascular system, respiratory tract, vascular system, brain, metabolism, thyroid) that could affect the course of the study * Malignant disease * Simultaneous participation in an interventional study or participation in an interventional study in the last two months before study inclusion * Clinically relevant addiction or substance abuse disorder (defined as alcohol, drug and drug abuse) * Insufficient mental possibility of cooperation * Therapy with oral anticoagulants (e.g., Marcumar) * Suspected lack of compliance * Medical, psychiatric or other conditions that restrict the patient's following abilities: to interpret the study information, to give informed consent, to adhere to the rules of the protocol, or to complete the study