Biomechanics & Biomaterials MCQs

An orthopedic surgeon is meticulously contouring a reconstruction plate for a complex pelvic ring injury. Which of the following implant materials is most notoriously susceptible to fatigue failure if deeply scratched or notched during bending?

Which of the following best describes the phenomenon of stress relaxation in a viscoelastic material such as a tendon?

Which of the following orthopaedic biomaterials has a Young's modulus closest to that of human cortical bone?

Highly cross-linked ultra-high-molecular-weight polyethylene (UHMWPE) was developed primarily to address which of the following issues in total hip arthroplasty?

Galvanic corrosion in orthopaedic implants is most likely to occur under which of the following circumstances?

Which of the following statements regarding the properties of polymethylmethacrylate (PMMA) bone cement is true?

Compared to conventional ultra-high-molecular-weight polyethylene (UHMWPE), highly cross-linked polyethylene used in total joint arthroplasty exhibits which of the following mechanical properties?

During material testing, a specimen undergoes a stress-strain analysis. The total area under the stress-strain curve up to the point of failure represents which of the following material properties?

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

A patient undergoes revision of a metal-on-polyethylene total hip arthroplasty due to a grossly loose femoral stem. Intraoperatively, black debris and pitting are noted specifically at the modular head-neck junction.

What is the primary mechanism of this degradation?

Polymethylmethacrylate (PMMA) bone cement is primarily utilized in total joint arthroplasty for implant fixation. Biomechanically, PMMA exhibits its greatest strength against which of the following forces?

During the clinical Lachman test, rapid translation of the tibia produces a stiffer response from the anterior cruciate ligament (ACL) than slow translation. This load-rate dependent behavior is characteristic of which material property?

Using a titanium screw through a 316L stainless steel plate in an aqueous physiologic environment increases the risk of which type of corrosion?

To reduce oxidative degradation of conventional UHMWPE after sterilization with gamma irradiation, modern manufacturing processes incorporate a thermal treatment known as remelting. What is the primary negative biomechanical consequence of this remelting process?

A 65-year-old active man undergoes a total hip arthroplasty using highly cross-linked polyethylene (HXLPE). While this material significantly reduces wear, the cross-linking and subsequent thermal melting processes reduce which of the following mechanical properties, predisposing thin components to failure?

To maximize the pullout strength of a cortical screw used in a diaphyseal fracture, which of the following design modifications is most effective?

A 60-year-old patient presents with a painful total hip arthroplasty 5 years after the index procedure. Aspiration is negative for infection. Revision surgery reveals black debris and macroscopic damage at the modular head-neck taper junction. Which type of corrosion is most likely responsible for this failure?

In evaluating the biomechanical behavior of ligaments, a constant static load is applied to a ligamentous specimen over a prolonged period. It is observed that the specimen undergoes a progressive increase in deformation over time. This viscoelastic property is termed:

During a cemented total knee arthroplasty, polymethylmethacrylate (PMMA) is utilized for component fixation. Which of the following statements regarding the biomechanical properties and function of PMMA is true?

During mechanical testing of a novel titanium alloy plate, the material is loaded in tension until catastrophic failure occurs. The total area under the stress-strain curve prior to failure represents the material's: