Prospective Clinical 5-year Follow-up of the LINK® SP-CL® Hip Prosthesis Stem

Inclusion Criteria: * Skeletally mature * Subject agrees to comply with the required postoperative management and follow-up evaluations * Undergone at least six (6) month of unsuccessful, conservative, non-surgical treatment * Patient understands the conditions of the study and is willing and able to comply with the postoperative scheduled clinical and radiographic evaluations and the prescribed postoperative management. * Patient signed Informed Consent. Exclusion Criteria: * Body Mass Index (BMI) \> 40 kg/m2 * Poor general state of health * Acute and chronic infections, local and systemic * Pharmaceutical or other drug abuse, alcoholism * Allergies to implant materials * Distinctive muscular, nerve, vascular or other diseases which put the affected limb at risk * Insufficient / inadequate bone mass- or quality which prevents a stable anchorage of the prosthesis * Severe osteoporosis * Foreseeable overload/ overstressing of the joint prosthesis * Acetabular defects * Female patient who is pregnant or plans to became pregnant during the course of the study * Prisoner * Patient who, as judged by the surgeon, is mentally incompetent or is unlikely to be compliant with the prescribed postoperative routine and follow-up evaluation schedule * Patient who has not signed the Informed Consent