Non achievement of the estimated sample size of the group silicone arthroplasty in a reasonable recruitment time.

The operational and favored standard therapy for the treatment of osteoarthritis in the distal interphalangeal joint is the arthrodesis, in which a titanium screw is used. Arthrodesis shows in the most cases the complete reduction of osteoarthritis pain and low loss of function. But restrictions are reported in fine motor skills.

The operation with silicone arthroplasty is similar. As an implant, a silicone joint is used, which has been sufficiently tested at the metacarpophalangeal joint and interphalangeal joint. The advantage of arthroplasty is the function obtained in the distal interphalangeal joint and the resulting improved fine motor skills.

Inclusion Criteria:

• primary osteoarthritis in the distal interphalangeal joint
• require surgical treatment
• patient aged 18 years and over
• signed written informed consent

Exclusion Criteria:

• posttraumatic osteoarthritis
• rheumatoid disease
• pregnant woman
• any disease process that would preclude accurate evaluation (e.g. neuromuscular, psychiatric or metabolic disorder)
• legal incompetence
• no knowledge of German