Clasp-knife deformity is relatively common anomaly found at the lumbosacral junction and characterized by a large midline defect of the posterior arch of the sacrum (usually S1/S2 and occasionally S3) along with hypertrophy (or overgrowth) of the spinous process of vertebra above (usually L5).
畸形是较类似于的腰骶部异常；基本特征是骶骨后弓的两条线的大块脊柱（举例来说S1/S2和而会是S3）伴其上椎体（举例来说是腰5）棘突纤细（或过度生长）。
When a Clasp-knife deformity is accompanied by pain on extension secondary to protrusion of the enlarged spinous process (knife blade) into the sacral spinal c, it is called Clasp-knife syndrome.
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