The Distance Between FCL And Lateral Tibial Plateau And Its Clinical Significance In TKA

Objective:Measure distance between the fibular collateral ligament and lateral tibial plateau,provide objective and accurate reference data for placing the tibial prosthesis duringTKA.Methods:1、Randomly selected60cases patients with unilateral knee disease to hospitalfrom April2013to February2014,divided into three groups according to the differentheight,each group of20people(10males and10females),Record their gender, age,left/right knee, weight and body mass index.2、All patients supine position，use belt to fix the contralateral normal knee andkeeping the knee straight in a neutral position,carry out MR scan for thickness of2mm and no interval.3、Scan with0°and7°tibial posterior slope,after the end of two scans selectMR imaging tomographic images with meaningful,includes five tibial osteotomythickness:6mm（H1）；8mm（H2）；10mm（H3）；12mm（H4）；14mm（H5）.A totalof ten tibial osteotomy thickness.4、Measuring the shortest distance between FCL and lateral tibial plateau one by one(accurate to0.1mm),data were recorded into the schedule.5、The correlations of the parameters were analyzed by statistics software（SPSS19.0）.Results:1、In the same tibial osteotomy surface， the distance has no significantdifferences(P>0.05)by sex and left/right knee.2、According to the different groups in height（I、II、III group）:2.1There were significant differences about the distance between the differ-ent groups(P<0.00)，with the increase of height the spacing becomes larger.2.2In the same gender，there were significant differences about the distancebetween the different groups(P<0.05)，with the increase of height the spacing beco-mes larger.2.3There were no significant differences about the distance between males andfemales in the same group (P>0.05).3、According to the different groups in BMI(A、B、C group): there were nosignificant differences about the distance between A1H4and A1H5（P>0.05）,therewere significant differences about the distance between other groups(P<0.05). A2(7°)group with the increase of BMI the spacing becomes smaller,A1(0°)group had no lawto follow.4、There are highly positive correlation between spacing and height,but spacingand most BMI exists lower negative correlation(except A1H5,P=0.07).5、The comparison of the same thickness different tibial posterior slope of tibialosteotomy and the comparison of the same tibial posterior slope different thickness oftibial osteotomy:5.1The same thickness different tibial posterior slope of tibial osteotomy:therewere significant differences about the distance between the A1H5、A2H5groups(P=0.00)，there were no significant differences about the distance between other fourgroups(P>0.05); With the increase of angle the spacing becomes larger(except H4).5.2The same tibial posterior slope different thickness of tibial osteotomy:therewere significant differences about the distance between H1to H5groups(P<0.05); With the increase of thickness the spacing showed a trend of decrease after the first increase.Conclusion:The distance between FCL and knee lateral tibia plateau range for about5-6mm, Provide compatible spacing for placing the tibial prosthesis during TKA.