In this randomized study, we wish to investigate with the use of clinical and radiological parameters whether there is a difference between the result of treatment of shoulder osteoarthritis with the Copeland resurfacing prosthesis and the Global CAP resurfacing prosthesis.~Clinical parameters with the help of the Constant Shoulder Score (CSS) and Western Ontario Osteoarthritis of the Shoulder Index (WOOS):~Pain~Activities of Daily Living (ADL)~Range of Motion (ROM)~Muscle strength~Radiologic parameters:~Migration of resurfacing prostheses with use of MB-RSA~Bone density around the prosthesis measured with Dual Energy X-ray Absorptiometry (DEXA)~Correlation between bone density and prosthesis migration
The purpose of this study is to determine whether there is a difference between the result of treatment of shoulder osteoarthritis with two different shoulder prostheses.