The purpose of this study is to compare the direct anterior approach and the direct lateral approach in primary total hip arthroplasty, regarding the postoperative function and pain, complications, radiological finds (X-ray), postoperative hemorrhage, markers for muscle damage (i.e creatine kinase (CK), lactate dehydrogenase(LDH/LD) , aspartate aminotransferase(AST), C-reactive protein (CRP),Troponin and Myoglobin) or other clinical outcomes.