The experimental research Of measure Of the lower lumbar nerve root canal cubage

Objective To discuss the appraisement method and offer a quantify survey index of the lower lumbar nerve root canal osteal cubage.Methods Twenty embalmed cadaveric specimens were adopted successively spiral CT(SCT) scan and paraffin filling,and then measure the left and right nerve root canal osteal cubage of L 3,4 ,L 4,5 and L 5 S1.Scan range is from superior L 3 to superior S 2 ,Original images were carried through three dimensional reconstructions(3DR) using 02 image work station, nerve root canal osteal cubage include superior and inferior midpoint of pedicle and inner and outer margin, 3DR measure method were compared with paraffin filling.Results Two measure methods have no significant (p0.05). Conclusion The method using SCT and 3DR for measure the osteal cubage of nerve root canal is simple ,easy and reliable;By comparision, cubage measure is more truthfulness to reflect of nerve root canal changing;The evaluating criterion of nerve root canal osteat cubage reduces manipulate error evidence and nerve root canal osculation is correlation with intervertebral disc and nerve root.