Intra - operative monitoring of cortically recorded somatosensory evoked potentials ( seps ) by peripheral nerve stimulation is of value during orthopaedic surgery and is the state - of - the - art in terms of non - invasiveness , versatility , time requirement , lateral discrimination , and ease of electrode placement 通过外周神经刺激由皮质记录的体感诱发电位的术中监测在骨科手术中具有重要价值，具有非侵袭性，多功能，需时，侧方识别，容易电极插入等优点。
At present , there are doubts about the applications of sep at the diagnose of ldh . for this , in this study , we perform the examination of ptnsep and dsep on 60 patients with ldh and 30 healthy subjects in order to find the objective , dependable index , and evaluate its usefulness for estimating the location and extent of nerve root dysfunction , and provide the clinical forensic medicine with objective evidence 为此，本文对60例ldh患者行胫后神经体感诱发电位( posteriortibialnervesomatosensoryevokedpotential ， ptnsep )和皮节体感诱发电位( dermatomalsomatosensoryevokedpotential ， dsep )检查，并以30例正常人作为对照，寻求客观稳定的观察指标，进一步探讨sep对神经根功能状态评定的价值，以期为临床法医学鉴定提供客观依据。
Sep is a kind of bioelectric reaction which is characterized by time - locked and special response . the response can be reorded at the any part of special somatosensory system including from derma - tomes to peripheral nerve , spinal posterior root , et al , when stimulated in a proper style 体感诱发电位是对躯体感觉系统的任意一点包括从皮肤节段到外周神经干、脊髓神经后根等，给予适当形式刺激后，在该系统特定通路上的任何部位均可检出与刺激有相对固定的时间间隔和特定形式的生物电反应。
