All invasive orthopedic interventions (arthrodesis, arthroplasty, synovectomy, and other) by inhibitor status. Inhibitor negative is no reported inhibitor presence in the year prior to and year of an orthopedic intervention. Inhibitor positive is presence of inhibitor the year prior to and year of an orthopedic intervention. Other, represents a non-specific group of invasive orthopedic interventions not categorized as arthrodesis, arthroplasty or synovectomy.