In the athlete with a suspected stress fracture it is best to choose mri as the first advanced imaging test.
Left acetabular roof mri.
22 acetabular depth can be quantified on the same oblique axial images that are used to calculate the alpha angle.
Protrusio acetabuli and acetabular retroversion a posteriorly oriented acetabulum can be seen on oblique axial mri of the hip.
Type 1 which was filled with contrast material on mr arthrograms and type 2 which was filled with cartilage.
Often the initial radiographs are normal especially in the elderly os teoporotic patient.
The reported incidence is approximately 3 per 100 0.
Acetabular fractures are a type of pelvic fracture which may also involve the ilium ischium and or pubis depending on fracture configuration.
Metastatic lesions localized in the periacetabular area cause troublesome pain and reduced mobility of the patients.
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.
Surgical treatment involving resection of metastatic lesions and joint reconstruction using bone grafts is burdened with a high rate of complications.
Saf was classified into two types.
It is seen in as many as 10 of hips and is typically located at the 12 o clock position both in the coronal and sagittal planes.
Radiotherapy effectively decreases pain yet it does not restore the ability to load the joint.
The new high field strength magnets operating at 1 5 tesla are more comfortable for the patient.
It is located more medially within the acetabular roof than the saf immediately adjacent to the acetabular notch figure 5.
The acetabular retroversion will result in an increase in coverage of the anterior aspect of the femoral head.
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.
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.
Epidemiology acetabular fractures are uncommon.
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.
Subsequent mri was performed and demonstrated bone marrow oedema bmo in the acetabulum and the femoral head and neck figure 2.
