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Free practice question 4 of 20 · Basic science

Statistics, evidence, ethics & orthotics: a free FRCS (Tr & Orth) Section 1 question

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.

04Basic science·Statistics, evidence, ethics & orthotics
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A randomised trial allocates 60 patients having total knee replacement to an adductor canal block or to local infiltration alone. The primary outcome is the visual analogue pain score at 24 hours, and the scores in both groups are markedly skewed.

Which test is most appropriate for comparing the two groups?

How sure are you?

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Basic science: what the exam tests

Syllabus coverage, high-yield themes and the common traps.

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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.

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.

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