In vitro initial fixation of porous-coated acetabular total hip components. A biomechanical comparative study.
Two-phase in vitro testing was performed to determine the initial mechanical stability of uncemented but fixed porous coated acetabular components. Six each of three-screw fixation, two-peg fixation, and three-spike fixation porous acetabular components were implanted into fresh and embalmed human cadaver acetabula. Measurement of prosthesis-bone displacement at a load of 100 kg did not show a significant difference among the three methods of fixation. However, torque testing showed that three-screw fixation failed at significantly higher loads (46 N-m) than two-peg fixation (32 N-m) or three-spike fixation (32 N-m).
Lachiewicz
P F
PF
Division of Orthopaedics, University of North Carolina, Chapel Hill.
Suh
P B
PB
Gilbert
J A
JA
D000077:Acetabulum / Q000502:physiology*; D001696:Biomechanical Phenomena; D002102:Cadaver; D006622:Hip Prosthesis; D006801:Humans; D066298:In Vitro Techniques