Biomechanics & Biomaterials MCQs

If a stainless steel screw is used in conjunction with a titanium plate in an internal fixation construct, what type of corrosion is most likely to occur?

A surgeon plans to ream the medullary canal to accommodate a larger diameter intramedullary nail. The torsional rigidity of a hollow cylindrical nail is proportional to which of the following?

Cortical bone exhibits strain rate dependency. Which of the following best describes the mechanical behavior of bone when subjected to a high rate of loading, such as high-speed trauma?

A biomedical engineer is evaluating a new titanium alloy for intramedullary nails. During mechanical testing, the material undergoes proportional deformation up to a specific limit before permanent deformation occurs. The slope of the load-deformation curve in this linear elastic region represents which of the following mechanical properties?

A patient undergoes correction of a severe knee flexion contracture using a hinged external fixator. Over several days, the tension in the soft tissues gradually decreases despite the fixator maintaining a constant length. Which viscoelastic property does this phenomenon best describe?

A surgeon revises a failed stainless steel dynamic compression plate for a femur fracture by applying a titanium plate over the existing stainless steel screws. Several months later, rapid localized corrosion is noted at the screw-plate interfaces. Which of the following best explains this phenomenon?

Ligaments and tendons exhibit viscoelastic behavior, meaning their mechanical properties change depending on how quickly a force is applied. If a ligament is subjected to a rapid loading rate (high strain rate), how does its biomechanical response change compared to a slow loading rate?

The mechanical properties of cortical bone vary depending on the direction of the applied load. Cortical bone is strongest in compression along its longitudinal axis and weakest in tension transversally. This biomechanical characteristic is best termed:

On a load-elongation (stress-strain) curve of a normal ligament, what structural change is responsible for the initial "toe region"?

Combining a 316L stainless steel plate with a titanium alloy screw in a fracture construct is most likely to result in which type of corrosion?

A continuous, constant compressive load is applied to an intervertebral disc over several hours, resulting in progressive deformation over time. This specific viscoelastic property is defined as:

On the stress-strain curve of a normal tendon, the initial "toe region" represents which of the following structural events?

In total hip arthroplasty, the incorporation of highly cross-linked polyethylene primarily improves wear resistance by mitigating which specific mechanism of wear?

Galvanic corrosion occurs when two dissimilar metals are placed in physical contact within a conductive fluid environment. Which of the following metal combinations is most likely to result in significant galvanic corrosion in orthopedic implants?

When a constant load is applied to a viscoelastic ligament over an extended period of time, the tissue gradually elongates. This biomechanical phenomenon is known as:

Which of the following combinations of implant alloys placed in direct physical contact poses the highest risk of significant galvanic corrosion?

The unique ability of articular cartilage to withstand massive compressive loads is primarily determined by the biomechanical interaction between:

Which of the following combinations of orthopaedic implant materials is most susceptible to severe galvanic corrosion when placed in direct physical contact in vivo?

During the application of a dynamic splint to a contracted joint, a constant deformation is maintained over time. The observed decrease in peak force required to maintain this constant tissue length is an example of which viscoelastic property?