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X-ray and MRI indicates evidence of subchondral collapse, crescent sign, or flattening of the FH Stage IV MRI and X -ray show narrowing of the joint space with secondary degenerative changes in the acetabulum, which is the socket portion of the hip that is a part of the pelvis, such as cysts, osteophytes, and cartilage destruction.
A radiograph of a left hip joint, which reveals a thin, curvilinear lucent line parallel to the cortical margin of the femoral head, in a patient with avascular necrosis. In radiology , the crescent sign is a finding on conventional radiographs that is associated with avascular necrosis .
MRI imaging may follow, particularly if there is no specific evidence on radiographs, producing a three-dimensional reconstruction of the joint for better definition, to evaluate the hip cartilage, or measure hip socket angles (e.g. the alpha-angle as described by Nötzli [22] in 2-D and by Siebenrock in 3-D [23]).
Front X-ray of right knee of an adolescent (epiphyseal plates are open): arrows point to avascular necrosis and developing osteochondritis dissecans in the outer medial condyle of femur. In the early stages, bone scintigraphy and MRI are the preferred diagnostic tools. [18] [19] X-ray images of avascular necrosis in the early stages usually ...
The femur is the largest and thickest bone in the human body. It is considered the strongest bone by some measures, though other studies suggest the temporal bone may be stronger. On average, the femur length accounts for 26.74% of a person's height, [4] a ratio found in both men and women across most ethnic groups with minimal
It is coated with cartilage in the fresh state, except over an ovoid depression, the fovea capitis, which is situated a little below and behind the center of the femoral head, and gives attachment to the ligament of head of femur. The thickest region of the articular cartilage is at the centre of the femoral head, measuring up to 2.8 mm. [1]
On a normal radiograph, the line intersects the inferior pole of the patella, and so can be useful in diagnosing a broken femur as well as a patellar tendon rupture. It also helps to define "Schottle point" intra-operatively for reconstruction of MPFL(Medial patello-femoral ligament.) [3] It may also be used to describe the course of an ACL graft.
Femoral torsion is the angle between a line along the femoral head and neck axis and a second line that is touching the posterior border of both femoral condyles. The normal value at birth is approximately 32° and decreases gradually with age. In adults, the normal value ranges from 10° to 20°. [1]