Hip joint Femoral heads

— Bilateral symmetry Acetabula:

— Symmetry Position:

— Femoral heads articulate with the acetabula

— Femoral heads are well covered by the acetabular margins (see below)

Normal width of joint space Articular surfaces:

— Contours (smooth and congruent)

Normal cortical thickness on the articular surfaces

No marginal osteophytes No subchondral signal changes Femoral head and neck:

— Normal femoral neck angle (CCD angle) (see below)

Other structures •

Bone marrow signal:

— Homogeneous

— Fat-equivalent intensity

— No circumscribed "double line sign" (femoral head necrosis) or patchy bone marrow edema

Femoral shaft:

— Smooth margins

— Normal cortical thickness

— Bone marrow signal appropriate for age ("ad olescent" signal before age 25) and homogeneous


— Bilateral symmetry

— Homogeneous signal intensity

— No circumscribed hypointense or hyper-intense areas

Major nerves and blood vessels:

— No circumscribed expansion No lymphadenopathy

Structures of the lesser pelvis (bladder, prostate, and seminal vesicles or uterus and adnexa, intestinal structures, lymph node stations)

T2-weighted coronal image
Sagittal image
Axial image

Important Data

1 Center-edge angle of Wiberg:

2 CCD angle:

• Approximately 125-135°

3 Slope of acetabular roof:

4 Femoral head coverage by the acetabulum:

• Approximately 70% of articular surface

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