Left Acetabular Roof Mri

It is a thin star shaped focal bare area devoid of articular cartilage and can be mistaken for a pathologic defect at mri and arthroscopy.

Left acetabular roof mri.

Figure 1 bone scintigraphy anterior view showed intense uptake in the left acetabular region and less avid uptake in the femoral head and neck compared with the right side. Acetabular fractures are a type of pelvic fracture which may also involve the ilium ischium and or pubis depending on fracture configuration. Subsequent mri was performed and demonstrated bone marrow oedema bmo in the acetabulum and the femoral head and neck figure 2. Metastatic lesions localized in the periacetabular area cause troublesome pain and reduced mobility of the patients.

The reported incidence is approximately 3 per 100 0. 22 acetabular depth can be quantified on the same oblique axial images that are used to calculate the alpha angle. Often the initial radiographs are normal especially in the elderly os teoporotic patient. Protrusio acetabuli and acetabular retroversion a posteriorly oriented acetabulum can be seen on oblique axial mri of the hip.

Radiotherapy effectively decreases pain yet it does not restore the ability to load the joint. Saf was classified into two types. A supra acetabular fossa also known as pseudodefect of acetabular cartilage is an anatomic variant whereby a focal defect is evident within the subchondral bone of the acetabular roof. In the athlete with a suspected stress fracture it is best to choose mri as the first advanced imaging test.

A medical student a radiology fellow and two senior radiologists reviewed 1002 consecutive mr arthrograms for the presence of an accessory bony fossa in the roof of the acetabulum or saf. It is located more medially within the acetabular roof than the saf immediately adjacent to the acetabular notch figure 5. Type 1 which was filled with contrast material on mr arthrograms and type 2 which was filled with cartilage. The new high field strength magnets operating at 1 5 tesla are more comfortable for the patient.

The acetabular retroversion will result in an increase in coverage of the anterior aspect of the femoral head. Surgical treatment involving resection of metastatic lesions and joint reconstruction using bone grafts is burdened with a high rate of complications. A coronal fat saturated t2 weighted mr image of pelvis shows deficient acetabular roof in left hip center edge angle 20 consistent with hip dysplasia. Mri can be performed rapidly is cost effective and is sensitive and specific for the diagnosis of occult fracture.