Trauma

Fracture

Stress fracture

Toddler's fracture (minimally displaced spiral fracture of the tibia)

Soft tissue contusion

Ankle sprain

Infection

Cellulitis

Osteomyelitis

Septic arthritis

Lyme disease

Tuberculosis of bone

Gonorrhea

Postinfectious reactive arthritis

Tumor

Spinal cord tumors

Tumors of bone

Benign: osteoid osteoma, osteoblastoma

Malignant: osteosarcoma, Ewing's sarcoma

Lymphoma

Leukemia

Inflammatory

Juvenile rheumatoid arthritis

Transient synovitis

Systemic lupus erythematosus

Congenital

Developmental dysplasia of the hip

Sickle cell

Congenitally short femur

Clubfoot

Developmental

Legg-Calvé-Perthes disease

Slipped capital femoral epiphysis

Tarsal coalitions

Osteochondritis dissecans (knee, talus)

Neurologic

Cerebral palsy, especial mild hemiparesis

Hereditary sensory motor neuropathies