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Table 3 Maximum stress (Mpa) on each screw of different models under increasing loads

From: Finite element analysis of different configurations of fully threaded cannulated screw in the treatment of unstable femoral neck fractures

  Triangle Inverted Triangle Triangle with anterior single screw Triangle with posterior single screw Vertical
S* IP IA SP SA I* S A* I S P* I S M* I
500 N 63 202 222 146 228 100 147 75 293 146 43 455 138 54 262
1000 N 128 427 453 301 462 194 302 153 579 299 91 940 283 109 524
1500 N 195 676 692 464 703 284 466 231 854 460 142 1452 435 165 780
2100 N 263 945 941 635 950 369 637 311 1115 629 195 1990 593 223 1028
  1. S superior, IP inferoposterior, IA inferoanterior, SP superoposterior, SA superoanterior, I inferior, A anterior, P posterior, M middle
  2. *Partially threaded cannulated screw