Lumbosacral nerve-root anomalies.

Accessory Nerve Root and associated dural injury incidences encountered during lumbar microdiscectomy performed for lumbar disc hernias

“…During this kind of surgery, nerve root abnormalities may be encountered 15 . Some authors separated accessory nerve root abnormalities into three, fi ve or six groups 5,6 . Th e most commonly used is the Neidre and MacNab classifi cation.…”

“…Although our study included 820 operations performed with microdiscectomy technique, it was a 2123 patients in the study conducted by Posthaccini et al, and these abnormalities were divided into fi ve classes 5 . According to the Neidre and MacNab classifi cation, nerve root abnormalities were divided into six groups 6 .…”

“…Lumbosacral nerve root abnormalities are classifi ed under fi ve or six groups 5 . Awareness of an accessory nerve root abnormality reduces intraoperative injuries 6 .…”

Conjoined lumbosacral nerve roots

“…6 Cannon'dan sonra Postacchini ve arkadaşları, Kadish ve Simmons ve Kikuchi ve arkadaşları da bu anomalilerin sınıflama sistemlerini yapmışlardır. 7,8,9 L5 ve S1 rootları literatüre göre bu tip anomalilerden en sık etkilenen rootlardır ve tüm sayının %50'sine yakın denk gelmektedir. S2 root anomalileri ise yaklaşık olarak tüm vakaların 1/3'ünü oluş-turmaktadır.…”

Topographic relations between the neural and ligamentous structures of the lumbosacral junction: in-vitro investigation

“…For this reason, Noack and Kirgis [24] suspected an extraforaminal constriction of the nerve root caused by parts of the iliolumbar ligament. While numerous investigations have been conducted on intradural variations of the lumbar nerve roots and their neighboring relationships [12,16,17,22,32], there are hardly any clinical or anatomic studies concerning variations in their extradural course.…”