Shoulder osteoarthritis is one of the common causes of the shoulder pain. The shoulder arthroplasty
is an effective treatment alternative for the patients at advanced disease stage. We presented the first incident
case in Thailand who had been diagnosed with primary glenohumeral osteoarthritis and was surgically
treated by the humeral head surface arthroplasty. Efficacy and clinical outcomes of this treatment were
described.

Keywords: Humeral head surface arthroplasty, Shoulder osteoarthritis