Incidence of intravascular uptake in lumbar spinal injection procedures.

STUDY DESIGN: Multicenter, prospective, observational study. OBJECTIVES: To document the incidence of and factors associated with intravascular uptake during lumbar spinal injection procedures. SUMMARY OF BACKGROUND DATA: In prior reports, the incidence of inadvertent intravascular needle placement during contrast-enhanced, fluoroscopically guided lumbar spinal injection procedures has been incidentally noted to range from 6.4% to 9.2%. We present the first systematic prospective documentation of intravascular uptake of contrast dye during different types of lumbar injection procedures. METHODS: Fifteen interventional spine physicians in seven centers recorded data regarding intravascular uptake during 1219 contrast-enhanced, fluoroscopically guided lumbar spinal injection procedures. RESULTS: The overall incidence of intravascular uptake during lumbar spinal injection procedures as determined by contrast enhanced fluoroscopic observation is 8.5%. Caudal and transforaminal routes have the highest rates at 10.9% and 10.8%, respectively, followed by zygapophyseal joint (6.1%), sacroiliac joint (5.3%), and translaminar (1.9%) injections. Intravascular uptake is twice as likely to occur in those patients over rather than under 50 years of age. Preinjection aspiration failed to produce a flashback of blood in 74% of cases that proved to be intravascular upon injection of contrast dye. CONCLUSION: The incidence of intravascular uptake during lumbar spinal injection procedures is approximately 8.5%. The route of injection and the age of the patient greatly affect this rate. Absence of flashback of blood upon preinjection aspiration does not predict extravascular needle placement. Contrast-enhanced, fluoroscopic guidance is recommended when doing lumbar spinal injection procedures to prevent inadvertent intravascular uptake of injectate.

A retrospective review of the incidence and rehabilitation outcome of concomitant traumatic brain injury and ligamentous knee injury.

OBJECTIVES: To estimate the incidence of ligamentous knee injuries in patients with traumatic brain injury (TBI) involved in pedestrian versus motor vehicle collisions (PVMVC), to identify associated risk factors, and to compare rehabilitation outcomes and costs in TBI patients with and without ligamentous knee injury. DESIGN: Retrospective, case control. SETTING: An academic rehabilitation hospital with a large metropolitan referral base. PATIENTS: Twenty-three consecutive adolescent and adult subjects admitted for acute inpatient rehabilitation after a PVMVC from January 1, 1994, to January 1, 1996. RESULTS: Five subjects (22%) were found to have a ligamentous knee injury, one with bilateral injuries. Two of these six injuries were diagnosed only after presentation to the rehabilitation setting. The most common injury was an anterior cruciate ligament (ACL) disruption in 5 of 6 knees. A coupled ACL and medial collateral ligament injury was identified in 4 of 6 injured knees. The risk of ligamentous knee injury was most closely associated with the presence of a tibial plateau fracture (n=3) (chi2=12.420, p < .001). There was no statistical difference between groups with and without ligamentous knee injuries with respect to age, gender, inpatient acute or rehabilitation length of stay, admission, discharge, or change in motor Functional Independence Measure (FIM) interval measures, or rehabilitation costs. Four of the 5 patients with ligamentous knee injuries were successfully managed nonoperatively. A case illustrating longitudinal management is presented. CONCLUSIONS: TBI and ligamentous knee injuries, in particular ACL injuries, are common comorbidities after PVMVC. Physicians must maintain a high index of suspicion for ligamentous knee injuries in this population, particularly when a tibial plateau fracture is present. TBI patients with and without ligamentous knee injuries can have comparable functional outcomes when the ligament injuries are identified and appropriately managed, without incurring undue cost or length of inpatient rehabilitation.

Anatomic and technical considerations in needle electromyography of the lumbar spine.

Interpretation of the paraspinal needle electromyographic examination requires knowledge of complex and specialized anatomy and pathophysiological processes. The purpose of this article is to elucidate the anatomy and physiology of the lumbar paraspinal needle examination and apply this knowledge to accurate needle technique and rational clinical interpretation of the paraspinal examination.