A PA Wrist Projection Obtained with the Wrist in a Neutral

question 14

Multiple Choice

A PA wrist projection obtained with the wrist in a neutral position demonstrates
1) the scaphoid in partial foreshortening.
2) the center of the lunate positioned distal to the radioulnar articulation.
3) closed CM joints.
4) alignment of the long axis of the third metacarpal and radius.

• A) 1 and 3 only
• B) 2 and 4 only
• C) 1, 2, and 4 only
• D) 1, 2, 3, and 4

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Definitions:

Malonic Ester Synthesis

A carbon-carbon bond-forming reaction that uses malonic esters to synthesize carboxylic acids with various substituents.

Dieckmann Cyclization

A chemical reaction where a diester reacts with itself in the presence of a strong base to form a β-keto ester, effectively forming a ring structure as part of the process.

Cyclohexene

A volatile and flammable hydrocarbon with a cyclic structure, containing a single double bond, used as an intermediate in the synthesis of other compounds.

Crossed Claisen Condensation

A reaction involving the condensation of two different esters or an ester and a carbonyl compound under basic conditions to form a β-keto ester.