Biomechanics & Biomaterials MCQs

Galvanic corrosion is most likely to occur in orthopedic implants under which of the following conditions?

Which of the following orthopedic implant materials has a modulus of elasticity most similar to that of human cortical bone?

During the surgical correction of a relapsed clubfoot, a surgeon applies a sequential series of corrective casts. The gradual stretching of the contracted soft tissues over time under a constant applied load is an example of which viscoelastic property?

In the stress-strain curve of a cortical bone specimen under tension, which of the following mechanical properties is determined by the total area under the curve up to the point of failure?

On a stress-strain curve, the total area under the curve up to the point of material failure represents which of the following mechanical properties?

Which type of wear in total joint arthroplasty is characterized by the transfer of material from one surface to another due to localized micro-welding and subsequent tearing?

Fretting corrosion in orthopedic implants is most commonly observed at which of the following interfaces?

In the context of tissue biomechanics, the viscoelastic property of load relaxation is defined as:

On a stress-strain curve for a ligament, the initial 'toe region' represents which of the following physiological events?

Which of the following orthopedic implant materials has a modulus of elasticity most closely resembling that of normal cortical bone?

A patient undergoing gradual clubfoot correction with serial casting relies on a specific viscoelastic property of soft tissues. The progressive elongation of these contracted tissues under a constant load over time is best described as:

In the context of viscoelastic materials, what term describes the progressive deformation of a material over time when subjected to a constant load?

When comparing titanium alloys to stainless steel for use in orthopedic implants, titanium primarily exhibits:

The "toe region" of the load-elongation curve in normal ligament biomechanics primarily represents:

Galvanic corrosion in orthopedic implants is most likely to occur under which of the following conditions?

A clinician applies a constant deformation by placing a limb in a corrective cast. Over time, the internal tension within the constrained ligamentous structures gradually decreases. This viscoelastic property of ligaments is best defined as:

When biomechanically testing a biological ligament, a cyclic loading and unloading curve demonstrates that the unloading path does not trace the same path as the loading curve. The area between these two curves represents energy lost as heat. This property is defined as:

Following a multi-level lumbar spinal fusion, adjacent segment disease (ASD) is a recognized complication. Which of the following surgical factors has been shown to most significantly increase the risk of developing symptomatic ASD at the proximal adjacent level?

A 28-year-old male powerlifter feels a tearing sensation in his anterior chest wall while performing a heavy bench press. Examination reveals an asymmetric loss of the anterior axillary fold and marked weakness in internal rotation. MRI confirms a complete rupture of the pectoralis major tendon at its humeral insertion. Based on the biomechanics of the bench press exercise, which specific fibers of the pectoralis major are typically under the greatest tension and tear first?

Regarding the biomechanics of cortical bone, which statement is most accurate?