Biomechanics & Biomaterials MCQs

On a stress-strain curve for a given orthopedic alloy, the specific point at which the material transitions from elastic deformation to permanent plastic deformation is defined as the:

A surgeon inadvertently uses a stainless steel screw with a titanium alloy plate in a saline-rich physiologic environment, increasing the risk of galvanic corrosion. Which of the following statements is correct regarding this couple?

When a constant compressive load is applied to articular cartilage, the fluid is slowly extruded from the extracellular matrix, resulting in a time-dependent increase in deformation. This viscoelastic property is known as:

Which of the following orthopedic materials has a modulus of elasticity (Young's modulus) closest to that of cortical bone?

When a constant force is applied to a ligament over time, the ligament will slowly elongate. What is this viscoelastic property called?

Which of the following pairs of orthopaedic implant materials is most likely to undergo severe galvanic corrosion if placed in direct physical contact within the body?

In the biomechanical evaluation of orthopedic implant materials, the total area under the stress-strain curve represents which of the following material properties?

During surgical lengthening of a contracted Achilles tendon, the surgeon applies a constant tension to the tendon over several minutes, noting that it progressively stretches. This viscoelastic property is best defined as:

A surgeon considers using a titanium alloy screw to secure a stainless steel plate for a fracture. This combination is generally avoided due to the risk of accelerated degradation of the stainless steel. What is the primary mechanism of this degradation?

When a constant deformation is applied to a viscoelastic material such as a ligament, the force required to maintain that deformation decreases over time. This phenomenon is known as:

Which of the following points on a stress-strain curve represents the maximum stress a material can withstand before failing?

A patient undergoes revision total hip arthroplasty. The retrieved femoral component shows a localized form of corrosion at the modular head-neck junction. This phenomenon is primarily driven by small relative motions between the components and is known as:

In total joint arthroplasty, the phenomenon where microscopic asperities of a harder material cut through a softer material is known as:

During cyclical loading and unloading of a viscoelastic structure such as a tendon, the energy lost as heat is represented by the area between the loading and unloading curves. This phenomenon is termed:

In the biomechanical behavior of ligaments, the phenomenon where a constant displacement results in a progressive decrease in the load over time is known as:

How does the torsional strength of a solid cylindrical bone change if its radius is doubled?

On a stress-strain curve, the point at which a material begins to undergo permanent deformation and no longer returns to its original shape when unloaded is defined as the:

A stainless steel screw is inadvertently used with a titanium plate for fracture fixation. Which type of corrosion is most likely to occur?

Cortical bone exhibits different mechanical properties depending on the direction of the applied load. This material property is termed:

A viscoelastic material subjected to a constant strain will demonstrate a gradual decrease in stress over time. This phenomenon is known as: