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).
病症是较常见的腰骶部异常；特点是骶骨后刃的中线的内层缺损（有时候S1/S2和偶尔是S3）伴其上额角（有时候是腰5）棘突粗大（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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