Dual Mobility in "High Risk" Patients

Inclusion Criteria:

• Primary THA for a diagnosis of osteoarthritis or inflammatory arthritis in thesetting of a history of prior lumbar or lumbosacral fusion performed at least 6months prior to their THA. In addition, patients considered high-risk for potentialprosthetic dislocation will be included based on the presence of one or more of thefollowing: neuromuscular disorder (e.g. cerebral palsy, Parkinson's disease, historyof a stroke), dementia or cognitive impairment, substance or alcohol abuse (>10drinks per week), acute displaced femoral neck fracture, age > 75 years,inflammatory arthritis, and increased preoperative range of motion (calculated asdescribed by Krenzel et al.: combined flexion, adduction, internal rotation > 115degrees).

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 femurfracture or osteotomy)

• or a preoperative diagnosis of post-traumatic arthritis, avascular necrosis, orfracture