Name : Morteza
Family :Sanei Taheri
Resident : Samira Shahhamzei
Gender : Male
Age : 40
40-year-old man with left hip pain with no special history
Imaging Procedures and Findings
Coronal T1WI shows low signal in the superior portion of the right femoral head. This is a characteristic but not specific appearance for AVN.There is corresponding high signal area in coronal and sagittal PD fat saturation.(picture 1,2,3) Clinically, this patient had no underlying causes for AVN, and he was treated conservatively. Three months later, after near total cessation of the hip pain, a repeat MRI shows no abnormality in the hip. (picture 4,5,6)This is consistent with idiopathic transient osteoporosis of the hip.
This poorly understood disorder is an idiopathic process that begins with a painful hip with no underlying disorder or other findings other than osteoporosis, which is limited to the painful hip. Some believe it is early AVN; however, this has not been proved. Its appearance on MR is similar to that of early AVN in that low signal on T1WIs is seen throughout the femoral head and neck. Transient osteoporosis of the hip invariably is self-limited with full resolution. It tends to occur more often in men.
Transient Osteoporosis of the Hip
Brant WE, Helms CA. Fundamentals of Diagnostic Radiology, 3rd edition. P1191