Mild to severe pain hip pain
Often present with referred knee pain
Abnormal gait
Limp
Weakness
Thigh atrophy
Externally rotated hip
Loss of internal rotation
Loss of abduction
Loss of flexion
May present as acute (unstable), chronic (stable), or acute on chronic (following trauma)
Often present with referred knee pain
Limp
Weakness
Thigh atrophy
Loss of internal rotation
Loss of abduction
Loss of flexion
Slipped capital femoral epiphysis
Acute rheumatic fever
Interphalangeal dislocation 
Developmental dysplasia of hip
Lens dislocation
Femur fracture
Calcaneus fracture
Juvenile idiopathic arthritis