Biomechanics & Biomaterials MCQs

When a constant mechanical load is applied to a viscoelastic material such as a ligament, the material will undergo progressive deformation over time. This biomechanical phenomenon is referred to as:

If an orthopedic surgeon inadvertently uses a stainless steel screw through a titanium alloy locking plate, what mode of hardware failure or degradation is most likely to be accelerated?

On a stress-strain curve testing a specific orthopedic biomaterial, the concept of 'toughness' is best represented by which of the following?

In total hip arthroplasty, highly cross-linked polyethylene (XLPE) inserts significantly reduce wear rates. However, increasing the radiation dose during cross-linking has which of the following detrimental effects on the material properties?

In orthopedic implants, the combination of a stainless steel screw with a titanium plate can lead to early implant failure. What specific type of corrosion is most likely to occur in this scenario?

Which of the following metallic orthopaedic biomaterials has a modulus of elasticity that most closely approximates that of human cortical bone, thereby reducing the effect of stress shielding?

In orthopedic biomechanics, an interosseous ligament is held at a constant deformed length over an extended period. The observation that the internal tension within the ligament progressively decreases over time is defined as:

Which of the following orthopedic implant materials exhibits a modulus of elasticity most closely approximating that of cortical bone?

When mixing different metals in orthopedic implants, galvanic corrosion is a significant concern. Which of the following material combinations possesses the highest risk for severe galvanic corrosion in vivo?

During total joint arthroplasty, antibiotic-loaded polymethylmethacrylate (PMMA) bone cement is often utilized. To be effective and not compromise the cement properties, the chosen antibiotic must primarily be:

According to the principles of fracture biomechanics, how does increasing the distance between the near and far cortices at a fracture gap (increasing gap size) affect interfragmentary strain, assuming interfragmentary motion remains constant?

A surgeon plans to revise a fractured femur using a titanium locking plate and stainless steel screws. What is the primary biomechanical and chemical risk of combining these two metals in vivo?

Stress shielding around a non-cemented total hip arthroplasty stem is primarily related to a mismatch in which of the following physical properties between the implant and native bone?

Which type of corrosion is most likely to occur when a stainless steel screw is used to secure a titanium plate in fracture fixation?

Which of the following biomechanical terms accurately describes the progressive, time-dependent elongation of a ligament when it is subjected to a constant applied load?

Which of the following material combinations in a modular total hip arthroplasty carries the highest risk of galvanic corrosion?

Highly cross-linked polyethylene (HXLPE) is the standard bearing surface used in modern total hip arthroplasty due to its significantly decreased volumetric wear. However, the process of cross-linking and subsequent melting or annealing to eliminate free radicals leads to a clinically relevant decrease in which of the following mechanical properties?

A 55-year-old male undergoes a total hip arthroplasty. To minimize the risk of galvanic corrosion, the surgeon must be cautious about metal combinations. Which combination of stem and head materials is most strongly associated with galvanic and fretting corrosion at the trunnion?

In the context of orthopedic biomechanics and materials science, what does the "yield point" on a stress-strain curve specifically represent?