| Objective:To provide theoretical basis and basic data for establishing the lumbar database of average Chinese aged 20～30.Methods:115 cases of average healthy people(48 cases of male,67cases of female) living in the southern areas were chosen to be subject to the X-ray check of the AP & lateral view, over-flexion view and over-extension view of lumbar spine,the upper,middle and lower transverse diameters,the upper,middle and lower sagittal diameters,the anterior,middle and posterior heights of the vertebral body,the sagittal diameter of the vertebral canal,the range of intervertebral translation,the lumbar physiological curvature,the lumbar range of Motion were measured using international general-use method and domestic general-use medical measurement software(Huahai Medris);the index of the intervertebral space height,the index of the intervertebral curvature,the ratio of lumbar intervertebral height to vertebral body height, the ratio of posterior intervertebral height to anterior tervertebral height were calculated at the same time.Results:1.Height of the Intervertebral Space(unit:mm):(L1/L2～L5/S1)the height ranges of anterior intervertebral disc space were 12.09～17.51 for the male,10.30～15.83 for the female;the height ranges of middle intervertebral disc space were 12.43～16.72 for the male, 12.32～15.40 for the female;the height ranges of posterior intervertebral disc space were 6.11～8.96 for the male,6.02～8.10 for the female.2.Height of the Vertebral Body(unit:mm): (L1～L5)the height ranges of anterior intervetebral body were 29.55～32.59 for the male, 29.09～31.46 for the female;the height ranges of middle intervetebral body were 27.25～29.15 for the male,25.93～27.45 for the female;the height ranges of posterior intervetebral body were 29.57～33.86 for the male,28.38～31.90 for the female.3.Sagittal Diameter of the Vertebral Body(unit:mm):(L1～L5) the length ranges of upper verterbral body were 39.25～42.2 for the male,34.73～38.08 for the female;the length ranges of middle verterbral body were 35.66～39.05 for the male,32.16～35.74 for the female;the length ranges of lower verterbral body were 40.02～42.63 for the male,35.60～38.20 for the female.4.Transverse Diameter of the Vertebral Body(unit:mm):(L1～L5)the transverse diameter ranges of the upper vertebral body were 48.44～59.60 for the male,42.24～54.87 for the female;the transverse diameter ranges of middle vertebral body were 43.78～55.42 for the male,38.66～52.33 for the female; the transverse diameter ranges of lower vertebral body were 51.61～63.05 for the male,45.44～59.44 for the female.5.Sagittal Diameter of the Vertebral Canal(Boujsen method, unit:mm):(L1～L5) the ranges of sagittal diameter of the vertebral canal were 19.23～24.93 for the male,18.29～23.91 for the female.6.Lumbar Physiological Curvature(overlay method, unit:°):(L1/L2～L5/S1)angle range of the segments was 3.36～17.69,the total degree of curvature was 43.84 for the male;the angle range of the segments was 3.86～17.92,the total degree of curvature was 49.45 for the female;In conclusion,the angle range of segments of male were wider than that of female,there was no distinct difference between the male's and female's for the angle of each segment(P＞0.05).7.Range of mothion from neutral position to over-flexion or over-extension position(overlay method,unit:°):(L1/L2～L5/S1)the ranges of motion within the close segments in the over-extension position showed gradual increase from up to down both for the male and female,the ranges of motion were 5.55～23.22 for the male, 6.51～21.98 for the female;In the over-flexion position,the ranges of motion within the close segments showed gradual decrease form up to down,the ranges of motion were 4.94～8.60 for the male,4.63～8.03 for the female;In conclusion,overall the ranges of motion of within the dose segments in the over-extention position were wider than that in the over-flexion postion, there was no distinct difference between the overall segement motion range of male's and female's.8.Range of mothion from neutral position to over-flexion or over-extension position(included angle method,unit:°):the motion ranges of the close segments in the over-extension position were 12.48～17.62 for the male,12.54～18.61 for the female;In the over-flexion position,the motion ranges of the segments were 4.71～6.82 for the male,4.96～7.12 for the female;In conclusion,overall motion ranges of the segments in the over-extention position were wider than that in the over-flexion postion,there was no distinct difference between the two genders.9.Flexion and Extension Motion Range of Lumbar Vertebra(L1/L2～L5/S1,unit:°):the range of segments motion(overlay method) were 17.19～23.94 for the male,17.5～25.71 for the female,the ranges of segment motion showed gradual increase both for the male and for the female;the ranges of segment motion(angle method) were17.19～23.94 for the male,17.5～25.71for the female,the range of motion became gradual increase from up to down,the value derived from included angle method was higher than that from overlay method.There was difference between the two genders(P＜0.05). 10.Range of intervertebral translation(unit:mm):the ranges of translation were 2.18～4.16 for the male,1.85～3.45 for the female,the ranges showed gradual increase from up to down both for the male and female,male's were bigger than the female's,however,the difference of the translation ranges between the genders was not distinct.11.Index of the Intervertebral Space Height,Index of the Intervertebral Curvature:the indices of the intervertebral space height showed gradual increase from up to down both for the male and female,the index ranges were 0.33～0.48 for the male,0.31～0.45 for the female;the indices of the intervertebral curvature showed gradual increase from up to down,the index ranges were 0.21～0.31 for the male,0.16～0.29 for the female,both of the indices were quite stable,the index differences between that of the male and female were not distinct.12.Ratio of Lumbar lntervertebral Height to Vertebral Body Height:the ranges of anterior ratio were 0.41～0.57 for the male, 0.36～0.48 for the female;the ranges of middle ratio were 0.46～0.60 for the male,0.46～0.58 for the female;the ranges of posterior ratio were 0.19～0.28 for the male,0.20～0.27 for the female;In conclusion,the indices were quite stable for both the male and the female,however, the ratios of segements L4/L5,L5/S1 were relatively high,the gender difference of the index was not distinct(P＞0.05).13.Ratio of Posterior Intervertebral Height to anterior tervertebral height(Hp/Ha):the ratio was quite stable,the ranges of ratio were 0.47～0.52 for the male, 0.51～0.6 for the female,there was no distinct difference of index between the two genders(P＞0.05).Conclusions:1.Height of the intervertebral space:the anterior heights became gradual increase from up to down,the height variation of the middle height was big,the posterior height was relatively low and stable;the variation rule was in accordance with the lumbar physiological curvature and the configuration of intervertebral disc,there was height difference between the genders.2.Height of the vertebral body:the anterior intervertebral heights became gradual increase for both genders,the variation of the middle intervertebral height was quite big and the height was relatively lower than the anterior and posterior heights;for the posterior height,the vertebral body of L2 and L3 were relatively high,the vertebral of L4 and L5 were,on the contray,relatively low,which was in accordance with the variation rule of physiological curvature,generally,the vertebral body was columned sunk in the middle.3. Sagittal Diameter of the vertebral body:the upper sagittal diameters from L1 to L5 of the vertebral body became gradual increase for both genders;the middle and lower sagittal diameters from L1 to L4 of the vertebral body showed gradual increase,L5,however,was a little smaller, generally;the middle sagittal diameter was smaller than the upper sagittal diameter and lower sagittal diameters,showing a trapezia column sunk in the lumbar part.All of the diameters of male were bigger than that of female,the gender difference for each diameter was distinct. 4.Transverse Diameter of the vertebral body:the upper,middle and lower transverse diameters showed gradual increase from L1 to L5 for both genders,however,the middle traverse diameter was smaller than the upper and lower traverse diameters,therefore,the lumbar body was big at the two ends,sunk in the middle.All of the diameters of male were bigger than the female's,the differences between the two genders were distinct(P＜0.01).5.Sagittal diameters of the vertebral canal:It'sdate became gradual smaller from up to down,the data of male was a little higher than that of female,however,the difference between the genders was not distinct(P＞0.05).6.Physiological curvature(overlay method):the segment angles of male and female became gradual increase from up to down,among them,the two segment angles of L4/L5 and L5/S1 were relatively big,except for distinct differences of the segment angle of L4/L5 between the male and female,the rest of the segments had no distinct difference.7.Range of the motion of lumbar vertebrae(over flexion,over extension):in the over extension position,the range of motion became gradual increase whether using overlay method or intervertebral included angle methods,the ranges of motion of L1/L2 and L2/L3 were relatively small,the ranges of motion of L4/L5,L5/S1 were relatively big,there was no distinct difference between the male and female while using the angle method.The range of motion in the over-flexion position was smaller than that in the over extension position,the ranges of motion became gradual increase from up to down while using intervertebral angle method,while using the overlay rule,the trends were on the contrary,the ranges of motion of the male and the female had no distince difference(P＞0.05).8.The overall range of motion(over-flexion plus over-extension):the ranges of motion of the lumbar vertebrae became gradual increase whether using the overlay method or intervertebral included angle method,part of the motion ranges of segments had distinct difference between the male and female.9.The ranges of intervertebral translation became gradual increase from up to down both for the male and for the female,for all of the segments,there was no distinct differences between the two genders,the range of translation was bigger in the over extension than that in the over-flexion postion.10.Index of the intervertebral space height,index of the intervertebral curvature,the ratio of lumbar intervertebral height to vertebral body height and the ratio of posterior intervertebral height to anterior tervertebral height were all quite stable,there was no distinct difference between the two genders.11.The data of the stature,body weight both male and female had certain relativity with the part date of the intervertebral space height,vertebral body height,sagittal diameter of the vertebral body, traverse diameter of the vertebral body.The relativity index for the male was lower than 0.5,the relativity index for the female was lower than 0.6.12.Distinct regional differences existed among all above dates.
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