Bone Remodeling Around a Trabecular Titanium Cup in Total Hip Arthroplasty

Inclusion Criteria: * Patient candidated to undergo unilateral cementless primary total hip arthroplasty with Jump System Traser® cup or Jump System HAX-Pore® cup by Permedica Orthopaedics (study sponsor). * Patient with primary or secondary hip osteoarthritis; * Patient who has given informed consent; Exclusion Criteria: * Male patients younger than 40 years or older than 85 years; * Female patients younger than 50 years or older than 85 years; * Childbearing; * Patients not indicated for receiving the investigational devices; * Patients not indicated for receiving cementless metaphyseal short femoral stems by Permedica Orthopaedics as the "Exacta RS" or "Exacta S" brand; * Patients with rheumatoid arthritis, avascular osteonecrosis, severe hip dysplasia (grade III-IV according to Crowe classification), Perthes disease, Paget disease, femoral neck fracture, pelvic fracture or sequelae of previous surgical procedures or trauma to the ipsilateral hip; * Patients with bone disorders; * Patients with diabetes; * Patients under PTH (parathyroid hormone), corticosteroid, or osteoporosis pharmacological therapy; * Patients with disabling disease in the contralateral limb; * Patients with BMI \> 30 or \< 18; * Patients not willing to follow the study protocol; * Patients incapable to understand the study protocol; * Patients addicted to alcohol or drugs; * Patients already enrolled in other clinical investigations;