The Impact Of Femoral External Rotation To Preoperative Digital Templating Of Total Hip Replacement

Background:Ischemic necrosis of femoral head is one of the commondiseases in clinical work, for various reasons most can not gettimely treatment, pathological changes gradually developmentleads to the hip joint damage, joint space narrow, osteoarthritis,eventually because of the loss of joint function were forced tohip arthroplasty. Joint replacement surgery with improvingtechnology and production process of the material after hiparthroplasty has been greatly improve satisfaction. Artificial hipreplacement surgery, preoperative design templatemeasurement is the basis of the successfully completedsurgery, obtain good effect. THA prosthetic design andmatching is to realize the ideal of mechanical transmission andobtain the key to long-term stability, the basis of prosthesis andbone match directly affects the effect of surgery. In recentyears, along with the continuous renewal of imaging equipment,more and more hospitals by using the computer X-rayphotography, digital X-ray photography and other advanceddigital imaging equipment THA preoperative digital templatemeasurement, greatly improve the accuracy of thepreoperative design, but by digital template for preoperativedesign there are still some error. This paper hope through the preoperative measurement and intraoperative use false body,a comparative analysis of error sources.Objective:This topic through the analysis of the controlled studies THAintraoperative use false size, template with preoperative digitalmeasuring false body shape, the size of the difference, discusslateral femoral rotation relations with THA preoperative digitaltemplate measurement accuracy, and may lead to the causes ofmeasurement errors. Guidance to improve THA preoperative digitaltemplate measurement accuracy, reduce intraoperative excessivespeculation, clear in the placement of implants, and obtain goodoperation effect.Methods:This topic the controlled studies from October2012toSeptember2013were included in the standard between cases,according to the rotation of the femur activity will be assigned to thestandard and Fixed extorsion group, standard flat piece and fixedXuanPing films respectively, then used TraumaCad2.0digitaltemplate preoperative measurement software. Records of twogroups of cases of preoperative measurement using digitaltemplate false number size and intraoperative application of falsebody size. Sort out standard and fixed screw group ofintraoperative application and preoperative measurement falsebody size difference, statistical analysis of the relationship betweenthe difference between the two groups, discuss the lateral femoralrotation effect on THA preoperative digital template measurement.Results:We use in actual use false body number template with preoperative application of digital measurement of false body sizedifference to represent the accuracy of measurement. Standard ofcomparing the results of the acetabulum side, groups:36caseswhen a cop value is0, the absolute value of a cop value to1in3,when the absolute value of a cop value is2in1case. Fixedextorsion groups:34cases when a cop value is0, the absolutevalue of a cop value to1in4cases, the absolute value of a copvalue of2in2cases. Lateral femoral than as a result, the standardgroups:34cases when a cop value is0, the absolute value of a copvalue to1in5cases, the absolute value of a cop value is2in1case. Fixed extorsion groups:25cases when a cop value is0, theabsolute value of a cop value to1in12cases,3cases when theabsolute value of a cop value is2. Application of completelyrandom design of two samples of rank and inspection statisticalmethods were analyzed, and determine the accuracy of themeasured on a standard set of preoperative digital template thanthe regular extorsion group.Conclusion:1, lateral femoral rotation of acetabulum THA had no effect onthe accuracy of preoperative digital template measurement,the lateral femoral THA preoperative digital template reducethe accuracy of measurement.2, TraumaCad2.0digital template software measurementaccuracy is higher.3, sufficient preoperative design is the basis of artificial total hipreplacement is completed.