Ni hao Henry,
That would indeed be nice, studies on the sensitivity of specificity. I
don't know of any, but I'm of course very interested if someone does.
Nevertheless, biomechanic logic dictates the following in my opinion (which
should be regarded as an addendum):
* If the hip comes off (= hip flexion) in prone, then the iliopsoas is
really tight (it means that the increased lumbar lordosis is not able to
compensate anymore);
* Because of this compensation by means of an increased lumbar lordosis, I'd
think that the supine knee-to-chest test is more sensitive, because the
lordosis does not occur;
* All hip extension and hyperextension ROM limitations can of course also be
caused by an articular hip problem. [To rule out OA, internal rotation
appeared to be the most sensitive - Birrell F et al, Predicting radiographic
hip osteoarthritis from range of movement. Rheumatology 2001 May;
40(5):506-512: "Restriction in internal rotation was the most predictive and
flexion the least predictive of radiographic OA. At this cut-off,
restriction in any single plane had a sensitivity of 86% for moderate and
100% for severe OA (specificity was 54 and 42% respectively).".]
R.,
Frank
----- Original Message -----
From: "Henry Tsao" <[log in to unmask]>
To: <[log in to unmask]>
Sent: donderdag 13 december 2001 0:03
Subject: Re: interpretation & test
I remember seeing a test in Magee for the iliopsoas which was in the same
position as the PKB. It said if the hip lifted off the bed, then the
iliopsoas is tight... but how sensitive or specific is this test? Tried
searching for it at PubMed but didn't get too many good hits. Anybody know
of good studies??
Henry***
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