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The mechanical performance of contoured Luque rods in a neuromuscular model of spine deformity was examined to define an upper limit of deformity above which rod stresses would exceed the endurance limit for 316L stainless steel and therefore predict fatigue failure. Bovine constructs varying from 0-120 degrees scoliosis were loaded axially, with strain recordings obtained at the apex of the curve. Relatively low loads produced enough tensile stress to contemplate implant fatigue in all except the nondeformed (0 degrees) construct. Construct stiffness was found to decrease rapidly in spines with greater than 38 degrees deformity. In addition, data on patients who had suffered rod fracture from four different centers were found to compare favorably with experimental observations. We conclude that the vulnerability of Luque rod constructs to implant failure, from a mechanical standpoint, is greater than is generally assumed. Cross-linking of rods was found to increase stiffness. Methods to decrease tensile stresses in the implants and increase stiffness include external immobilization, larger diameter rods, and procedures to enhance correction.
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
January 1985,
Archives of orthopaedic and traumatic surgery. Archiv fur orthopadische und Unfall-Chirurgie,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
April 1991,
Spine,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
June 2021,
Studies in health technology and informatics,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
April 1986,
The Journal of bone and joint surgery. American volume,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
January 1991,
Orthopedic nursing,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
January 1989,
The Journal of bone and joint surgery. American volume,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
December 1994,
Journal of the Medical Association of Thailand = Chotmaihet thangphaet,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
May 1994,
Spine,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
February 1986,
Clinical orthopaedics and related research,
C E Johnston, and
R B Ashman, and
M C Sherman, and
C F Eberle, and
W A Herndon, and
J A Sullivan, and
A G King, and
S W Burke
January 1989,
Revue de chirurgie orthopedique et reparatrice de l'appareil moteur,
