Gait Analysis of Anterior Versus Posterior Approach in Performance of Total Hip Arthroplasty

Inclusion Criteria: * Patients fulfilling the standard criteria for the implantation of primary total hip arthroplasty * Those presenting with primary or secondary osteoarthritis * Those presenting with disease that meets the indications for use for Medacta USA implants defined by this study (on-label use) Exclusion Criteria: * Pregnant women or women who plan to conceive within the year following surgery * Inflammatory arthritic condition * Those whose prospects for a recovery to independent mobility would be compromised by known coexistent, medical problems * Those already treated with a failed Total Hip Arthroplasty (THA) * Muscle contracture around the hip joint * Individuals who have undergone organ transplant * Those with a known co-existent medical condition where death is anticipated within five years due to the pre-existing medical condition. * Those with one or more medical conditions identified as a contraindication defined by the labeling on any Medacta implants used in this study * Individuals who have had a THA on the contra-lateral side within the 6 months. * Individuals who have undergone a THR on the contra-lateral side and whose outcome is considered unsatisfactory or not good * Individuals requiring bilateral hip replacement * Individuals whose body mass index (BMI; kg/m2) \>40 * Individuals with active or suspected infection or sepsis * Individuals with chronic renal failure as defined by the need for dialysis * Patients with severe forms of developmental dysplasia of the hip (DDH): Crowe types II, III, IV * History of drug and/or substance abuse