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).
畸形是较常见的肘骶部异常；特征是骶骨后腰的延线的大块缺损（多半S1/S2和有时候是S3）伴其上椎体（多半是肘5）棘突肥大（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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