| Infectious | | Septic arthritis of the hip | | Septic arthritis of the sacroiliac joint | | Lyme disease | | Osteomyelitis of femoral head or pelvis | | Psoas abscess | | Pyomyositis | | Spinal epidural abscess | | Appendicitis or abdominal/pelvic abscess | | Inflammatory | | Transient synovitis | | Systemic arthritis | | - Spondyloarthropathy | | - Juvenile idiopathic arthritis (formerly juvenile rheumatoid arthritis; rare as isolated hip pain) | | - Infectious/post-infectious (eg, ARF, poststreptococcal arthritis) | | Other rheumatologic conditions (eg, SLE, MCTD, vasculitis, dermatomyositis, CRMO, localized scleroderma, FMF) | | Arthritis associated with gastrointestinal conditions (eg, IBD, celiac disease) | | Idiopathic chondrolysis of the hip | | | Mechanical/orthopedic | | Slipped capital femoral epiphysis | | Avascular necrosis | | - Legg-Calvé-Perthes disease | | - Secondary avascular necrosis | | Femoral stress fracture | | Muscular strain | | Iliac apophysitis | | Snapping iliopsoas tendon | | Trochanteric bursitis | | Acetabular labral tear | | Femoroacetabular impingement | | Apophyseal avulsion fracture with apophysitis | | Neoplastic | | Osteoid osteoma | | Leukemia | | Solid tumor, primary or metastatic | | Pigmented villonodular synovitis | | Other | | Sickle cell pain crisis | | Gaucher disease | | Neuromuscular disorders (eg, muscular dystrophies) | |
