title: Evaluation of the clinical efficacy of multiple lower-extremity nerve decompression in diabetic peripheral neuropathy.
abstract: OBJECTIVE
  To evaluate the value of high-resolution ultrasonography and neural electrophysiology in early diagnosis, operative opportunity selection, and clinical effect assessment of DPN.
  
  
  METHODS
  Five hundred and sixty patients with diabetic peripheral neuropathy (DPN) were treated with DELLON surgical nerve decompression in our hospital in the past 5 years. Before and after 18 months surgery, the tests of the Toronto clinical scoring system, high-resolution ultrasonography, QST, and Nerve Conduction Velocity (NCV) were evaluated in all cases. The control group included 40 diabetic patients in the same age range but without DPN.
  
  
  RESULTS
  Ultrasonographic images revealed an apparently normal proximal common peroneal nerve, tibial nerve marked swelling, enlarged, and hypoechogeneity with loss fascicular pattern. The cross-sectional-area, anteroposterior and transverse diameter were measured preoperative and prooperative, and the differences had statistical significance (P < 0.01). NCV-positive cases amount to 74.9% DPN patients in this study and QST-positive cases amount to 90.9% and had significant differences between them (P < 0.05). Postoperative NCV and cold perception threshold significantly increased (P < 0.05) compared with that of the before surgery. Postoperative warm perception threshold (P < 0.01) and vibration perception threshold (P < 0.05) were significantly lower than the preoperative value. NCV was positively correlated with cold perception threshold (r = 0.395, P < 0.01), and negatively correlated with warm perception threshold (r = - 0.387, P < 0.01) and vibratory perception threshold (r = - 0.367, P < 0.01). The preoperative TCSS score was 19 points for all the cases, and 420 cases (75%) improved to 10-13 points (P < 0.01).
  
  
  CONCLUSIONS
  Ultrasonography is capable of depicting these nerves morphological information, with respect to exact location, course, and extent. QST is suitable for early diagnosis of DPN, and abnormal QST is an indication of lower extremity nerve decompression for DPN. The joint use of QST and NCV testing helps surgeons to grasp the timing of surgery. High-resolution ultrasound, QST and NCV testing can also be used as an outcome index for surgical treatment.
authors.affiliation: Department of Neurosurgery, XinHua Hospital, Affiliated to Shanghai JiaoTong University School of Medicine , Shanghai , P. R. China.
authors.forename: Wenchuan
authors.initials: W
authors.lastname: Zhang
authors.forename: Wenxiang
authors.initials: W
authors.lastname: Zhong
authors.forename: Min
authors.initials: M
authors.lastname: Yang
authors.forename: Jun
authors.initials: J
authors.lastname: Shi
authors.forename: Li
authors.initials: L
authors.lastname: Guowei
authors.forename: Qiufeng
authors.initials: Q
authors.lastname: Ma
mesh_terms: D000368:Aged; D019299:Decompression, Surgical / Q000379:methods*; D003924:Diabetes Mellitus, Type 2 / Q000150:complications; D003929:Diabetic Neuropathies / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008866:Microsurgery; D008875:Middle Aged; D009431:Neural Conduction; D009460:Neurologic Examination; D019635:Neurosurgical Procedures / Q000379:methods*; D010523:Peripheral Nervous System Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D010543:Peroneal Nerve / Q000000981:diagnostic imaging / Q000601:surgery; D012677:Sensation; D012684:Sensory Thresholds / Q000502:physiology; D012883:Skin Ulcer / Q000150:complications; D013697:Thermosensing / Q000502:physiology; D013979:Tibial Nerve / Q000000981:diagnostic imaging / Q000601:surgery; D016896:Treatment Outcome; D014463:Ultrasonography