Trethowan sign
Review for
the generalist: evaluation of pediatric hip pain. Klein"s line in normal situation versus in slipped capital femoral epiphysis [13]. Klein"s line is drawn along the radiographic border of the neck of the femur. This line should intersect the epiphysis. A, Klein"s line in normal situation. B, Alignment of Klein"s line with slip: the epiphysis is out of alignment.
Prepubertal
onset of slipped capital femoral epiphysis associated with hypothyroidism: a case report and literature review. Radiological findings of the patient. Radiographs of the hip joint show Trethowan’s sign bilaterally in the frontal view (a) and a posterior tilting angle of 25° on the right side (b) and 34° on the left side (c) in the Lauenstein view
The Trethowan sign is used to diagnose slipped capital femoral epiphysis (also called slipped upper femoral epiphysis). In this sign, the line of Klein passes above the femoral head.
It is best done on both AP and true lateral projections. On the AP view of a normal hip, the Klein line intersects a small portion of the lateral capital epiphysis.
In typical posterior displacement of the capital epiphysis, the line intersects a smaller portion of the epiphysis or does not intersect it at all - the positive Trethowan sign.
It is one of the signs that may help in the initial phase (mild slip) with typical posterior displacement, where AP radiographic findings are known to be subtle.
See also
Siehe auch:
Assoziationen und Differentialdiagnosen zu Trethowan Zeichen: