Clinical Research Directory

Inclusion Criteria: * Primary THA for a diagnosis of osteoarthritis or inflammatory arthritis in the setting of a history of prior lumbar or lumbosacral fusion performed at least 6 months prior to their THA. In addition, patients considered high-risk for potential prosthetic dislocation will be included based on the presence of one or more of the following: neuromuscular disorder (e.g. cerebral palsy, Parkinson's disease, history of a stroke), dementia or cognitive impairment, substance or alcohol abuse (\>10 drinks per week), acute displaced femoral neck fracture, age \> 75 years, inflammatory arthritis, and increased preoperative range of motion (calculated as described by Krenzel et al.: combined flexion, adduction, internal rotation \> 115 degrees). Exclusion Criteria: * Less than 18 years of age * Revision THA * spinopelvic fusion that is more recent than 6 months prior to THA * isolated cervical or thoracic fusion * intent to undergo a revision spinopelvic fusion within one year of their index THA * a history of prior infection in the affected hip * a history of prior open surgery on the affected hip (i.e. prior proximal femur fracture or osteotomy) * or a preoperative diagnosis of post-traumatic arthritis, avascular necrosis, or fracture