Biomechanics & Biomaterials MCQs

If the diameter of a solid circular intramedullary nail is doubled, its torsional rigidity increases by a factor of:

Which type of corrosion is most likely to occur at the modular junction of a titanium femoral stem and a cobalt-chrome femoral head in a total hip arthroplasty?

A surgeon plans to use a plate and screw construct to stabilize a peri-prosthetic femur fracture around a well-fixed cobalt-chromium total hip stem. To minimize the risk of severe galvanic corrosion, which of the following combinations of metals should be strictly avoided in direct contact?

A 40-year-old male receives a dynamic compression plate for a forearm fracture. Postoperatively, one of the cortical screws is left untightened, allowing microscopic motion between the screw head and the plate during repetitive loading. This condition primarily predisposes the implant to which mechanism of failure?

A patient with a stainless steel plate undergoes revision fixation where a titanium screw is placed in direct contact with the plate. What type of corrosion is most likely to occur at the screw-plate interface?

When testing the viscoelastic properties of a tendon construct, a constant submaximal load is applied over time, resulting in progressive deformation. This phenomenon is termed:

A viscoelastic material undergoes continuous deformation when subjected to a constant load over a prolonged period. Which of the following terms best describes this biomechanical property?

When incorporating antibiotics into polymethylmethacrylate (PMMA) bone cement, which of the following antibiotic properties is most critical to ensure effective local elution without compromising cement curing?

A surgeon uses a stainless steel screw to fix a titanium plate in a fracture construct. Over time, localized corrosion occurs. What type of corrosion is caused by the electrochemical potential difference between these two dissimilar metals?

A surgeon plans to use a stainless steel screw to secure a titanium plate during an open reduction and internal fixation. What type of corrosion is most likely to occur at the interface of these two metals?

On a stress-strain curve for an orthopedic biomaterial, the total area under the curve up to the point of structural failure represents which of the following mechanical properties?

During fracture fixation, combining a 316L stainless steel plate with titanium screws in an electrolytic physiological environment can lead to implant failure. Which biomechanical phenomenon best describes this process?

In the biomechanical evaluation of tendons and ligaments, which of the following best defines the viscoelastic phenomenon of "creep"?

A viscoelastic material is subjected to a constant load over a prolonged period, resulting in a progressive increase in deformation. Which biomechanical property does this describe?

When a titanium alloy femoral stem is coupled with a cobalt-chromium modular femoral head in total hip arthroplasty, what type of corrosion is most likely to occur at the trunnion interface due to the difference in electrochemical potential?

When comparing titanium alloys (Ti-6Al-4V) to 316L stainless steel for orthopedic implants, which of the following is a primary biomechanical advantage of the titanium alloy?

When preparing antibiotic-loaded polymethylmethacrylate (PMMA) bone cement for the treatment of a periprosthetic joint infection, which of the following pharmacological characteristics is absolutely essential for the selected antibiotic?

A resident is performing serial casting for an infant with clubfoot. When stretching the foot into dorsiflexion, the resident holds the cast in a constant deformed position and notes that the force required to maintain this position decreases over time. Which biomechanical property of ligaments and tendons does this describe?