Objective To study the correlation between the lumbar pedicle shape(length and angle)and the size of intervertebral foramen in L4/L5 and L5/S1 segments.Methods From January 2020 to June 2022,50 patients with L4/L5 or L5/S1 lumbar disc herniation(LDH)in Changzheng Hospital of Naval Medical University were selected as the study group,and 50 healthy volunteers were selected as the control group.The maximum height and width of the L4/L5 and L5/S1 interlaminar space were measured on anterolateral and lateral lumbar roentgenographs,and the pedicle length and angle and the minimum height and width of the foramen were measured on CT.The multiple correlation of stepwise multiple linear regression was used to determine the independent influence of related variables on the size of intervertebral foramen and intervertebral disc.Results There were no significant difference in pedicle length at L4-S1,foramina height and interlaminar height at L4/L5 and L5/S1 segments between the 2 groups(P>0.05).The abduction angle of S1 pedicle in the study group was smaller than that in the control group.The L4 pedicle head inclination angle in the study group was higher than that of the control group,and S1 pedicle head inclination angle was lower than that of the control group.The differences of pedicle head inclination between L4 and L5,L5 and S1 were higher than those in the control group.Width of intervertebral foramen and lamina in L4/L5 and L5/S1 segments in the study group were smaller than those in the control group.There were significant differences in the above indexes(P<0.05).Pearson correlation analysis showed that age was negatively correlated with the height and width of the intervertebral lamina,as well as the height of the intervertebral foramen;the abduction angle of the pedicle was positively correlated with the width of the intervertebral lamina;length of the pedicle was positively correlated with the width of the intervertebral foramen;the difference of pedicle heads inclination angles between adjacent vertebrae was positively correlated with the width of the intervertebral foramen;the width of the intervertebral lamina was positively correlated with the width of the intervertebral foramen.Multiple linear regression analysis showed that the age,length and angle of the pedicle were independently correlated with the size of the intervertebral lamina and foramen.The abduction angle of the L5 and S1 pedicle was significantly positively correlated with the width of the intervertebral lamina,while the pedicle head inclination angle of L5 was significantly negatively correlated with the height of the L4/L5 and L5/S1 intervertebral foramen.The difference of pedicle heads inclination angles between adjacent vertebrae was significantly positively correlated with the width of intervertebral foramen.Conclusions The height and width of interbody and intervertebral foramen will decrease with the patient's age,and the width of intervertebral lamina will increase with the increase of the abduction angle of L5 and S1 pedicle.The greater the head inclination angle of L5 pedicle,the smaller the height of adjacent intervertebral foramen.With the increase of the difference of pedicle heads inclination angle between adjacent vertebrae,the width of intervertebral foramen increases.The angle and length of the pedicle affect the size of the interlaminar space and foramen,and these changes may affect the difficulty of surgery and the selection of surgical methods.
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