May Be Caused by

 Common

Avascular necrosis

Brodie abscess

Chondroblastoma

Giant cell tumor

Gout

Hemophilic pseudotumor

Osteoarthritis

Osteochondritis dissecans

Osteomyelitis

Pigmented villonodular synovitis

Rheumatoid arthritis

Synovial herniation pit of femoral neck

Tuberculosis

 Uncommon

Amyloidosis

Aneurysmal bone cyst

Angiomatous lesion

Avulsion fracture defect

Bone cyst

Bone sarcoma

Brown tumor of hyperparathyroidism

Clear cell chondrosarcoma

Enchondroma

Hydatid cyst

Intraosseous ganglion

Langerhans cell histiocytosis

Lipoma

Metastasis

Osteoid osteoma

Plasmacytoma