conventional open laminotomy and discectomy
...椎间盘切除术（Micmsurgical lumbar discectomy，MSLD）31例，传统腰椎间盘切除（Conventional open laminotomy and discectomy，COLD）29例，椎间盘镜腰椎间盘切除术（Microendoscopic discectomy，MED）24例..
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conventional open laminotomy and discectomy
常规开放式椎板切开术和椎间盘切除术
以上为机器翻译结果，长、整句建议使用 人工翻译 。