CORRECT ANSWER:
B) Positive McMurray test
MORE INFO:
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A positive Lachman test is often seen in an ACL tear. ACL tears -generally the swelling occurs more rapidly than meniscus.
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A positive McMurray sign is a good indicator of meniscal tear.
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At the time of the injury of an ACL tear, often a pop is heard (70% of the time according to Epocrates).
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Although every patient is different, rapid swelling of knee, an audible pop at time of injury, and a positive Lachman, are all good indicators that there is an ACL tear.
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Good indicators of a meniscal tears- a positive McMurray test, a positive Apley Grind test, and swelling that develops more gradually.
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Both ACL & meniscal have instability of the knee.