The correct answer is calcific tendinitis of the rectus
femoris muscle. The insertion of the tendon is bifid
and attaches to this characteristic location just above
the acetabulum. Compared with the shoulder, the hip
is an uncommon site of calcific tendinitis.
This series of diagnostic quizzes
that challenge your ability to read a variety of x-ray
films is
edited by Dr. Keats, alumni professor of radiology
at the
University of Virginia School of Medicine in Charlottesville.
