Free practice question 1 of 20 · Basic science
An original single best answer question in the style of the FRCS (Tr & Orth) Section 1 paper, with the answer and a referenced explanation. Pick an answer to reveal it, then rate how sure you were.
A surgeon is choosing between two solid titanium intramedullary nails for a femoral shaft fracture in a heavy patient. The nails are identical apart from their diameters of 10 mm and 12 mm.
The bending rigidity of a solid nail is proportional to its radius raised to which power?
Topic guide
Basic science: what the exam tests
Syllabus coverage, high-yield themes and the common traps.
Free article
The stress–strain curve and the material properties of orthopaedic biomaterials
The stress–strain curve for FRCS (Tr & Orth): Young’s modulus, yield, ultimate strength, toughness, fatigue and viscoelasticity, applied to metals, polyethylene, cement and ceramics.
Free article
Fracture healing and Perren’s strain theory: absolute and relative stability
Primary and secondary bone healing, the stages of callus, Perren’s interfragmentary strain theory, and how to choose absolute or relative stability for a fracture.
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