Reconstruction Of Three-Dimensional Stereo-Model And The Exploration Of Engineered Scaphoid Implant

Objective The study provide theoretical data for the design and insertion of neotype biomateral scaphoid implant and tendon-ball core after the scan of spiral computed tomograph and constructing three-dimensional stereo-models, measuring surface data, then desgining the models and tendon-ball core of scaphoid tentatively.Methods 1. Select specimen are healthy volunteers(50male & 50female) who are 20～36 years old, 145～193 centimeters high, 42～80 kilograms weigh, normal wrist by radiograph verified. Using spiral computed tomograph to scan both wrist joints and obtain geometric data which importing data by means of DICOM to personal computer and reconstructing three-dimensional stereo-models of scaphoid by MIMICS software. 2. Basing on central axis of scaphoid, measure surface data by proper tools of MIMICS directly. 3. contrast and analyze data of scaphoid for different genders and one's both hands with statistically software(SAS 9.0); complete perason's dependability analysis including data of length and angle with stature and weight. 4. desgin the models and tendon-ball core of scaphoid tentatively with Software(CATIA V5R16).Results 1. Maximal length of scaphoid(26.16±2.72)mm, Maximal width of scaphoid body(15.15±2.0)mm, Minimal height of scaphoid body(7.52±1.5)mm, Width of scaphoid tubercle (13.36±1.8)mm, Height of tubercle(8.81±1.0)mm, Angle of radial-scaphoid articular surface(151.86±6.36)°,Maximal angle of dorsal-scaphoid(133.85±5.85)°,Maximal macroaxis angle of scaphocapitate (138.00±5.05)°, Maximal transversal Angle of scaphocapitate (170.27±5.09)°,Proportionality of dorsal proximate-distal length (1.15±0.091).2. Contrasting data of both hands, the statistics analysis showes that there has no difference for one's both hands (P>0.05). Contrasting data of between male and female show that there has obvious difference for length(P<0.01), but no differencefor angles (P>0.05). Using these data to complete analysis of dependability with stature and weight respectively we can see that the length data have obvious dependability with stature, midrange dependability with weight; the angles data have no dependability with both them.Conclusion 1. The shudy completely obtain surface data of scaphoid, first time, improve and enrich the discription of scaphoid. 2. The related data of scaphoid are all key indexes to designing and inserting the neotype biomateral implant of the scaphoid, according to those data designing the implant and tendon-ball core is feasible. 3. according to contrasting those data with different height and weight, we can design a series of implants and tendon-ball cores. 4. The size of scapoid have obvious dependability with stature, we can select optimal implant or tendon-ball core on the basis of patients'stature.