Clasp-knife syndrome

Case contributed by Dr Omar M. Sultan


Low back pain.

Patient Data

Age: 35 years
Gender: Male

S1 spina bifida associated with elongated spinous process of L5. Thickening of left transverse process of L2 and L3. Small pelvic phlebolith seen on the left.

Case Discussion

S1 spina bifida associated with elongated spinous process of L5 resulting in a classical deformity known as clasp knife deformity. When this deformity is associated with pain during extension, it is known as clasp-knife syndrome.

Thickening of left transverse process of L2 and L3 may be related to previous trauma or fracture.

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Case information

rID: 37616
Published: 16th Jun 2015
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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