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e1
QUESTIONS
1. How would you construct a ligament prosthesis?
ANSWERS
1. Any design should take into account the specific
requirements. The main requirement of a ligament
is to transmit loads between the two bones to which
it is connected. Considering for instance an Anterior
Cruciate Ligament, its role is to fasten together the
femur and tibia and stabilize the knee. Any design
criterion should consider the structure and proper-
ligament has typical S-shaped stress–strain behavior,
with a toe region and a following linear region. This
behavior can be well reproduced by composites of
poly-2-hydroxyethylmethacrylate (PHEMA) hydro-
mixture rule to the PET/PHEMA composite and the
degree of crimping by analyzing the length of the toe
region in the natural ligament. Other, tougher hydro-
gels could be used instead of PHEMA, such as the
IPN double network gel of Gong, et al. described in
Chapter I.2.5 on Hydrogels.
2. The easy answer is “yes”. Then we should ponder the
answer, and consider which modulus the question
refers to (tensile, compressive, torsional, bending).
to fabricate materials having the same tensile or bend-
ing stiffness as bone. The reader should be aware of
the fact that the specific lamination sequence would
CHAPTER I.2.9
Classes of Materials Used in Medicine
