A 22-year-old male asked:
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ct scan shows mild right side l5/s1 arthropathy with a bone spur. it pops while raising left leg. why is this?

1 doctor answer
Dr. Laurence Badgley
53 years experience General Practice
Not correct: Right l5s1 arthropathy doesn't cause popping, which emanates fr. Subluxing same sided scroiliac joint ( sij), which does "pop". Reason right sij pops is inherently loose ligaments, which allow counternutation of right sij when stable contralateral hemi-pelvis, w. Non-mobile sij, torques en block; from a moment of force imposed upon the left hemi-pelvis by an elevated ; extended left leg.
Answered on Feb 17, 2014
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1 comment
Dr. Laurence Badgley
53 years experience General Practice
Provided original answer
Counternutation is a term that describes relative motions that the sacrum and ilium undergo as they rotate in different directions around an imaginary axis of rotation that traverses each sacroiliac joint.  For example, counternutation of the right sacroiliac joint involves the right sacral SIJ contour rotating counterclockwise as the right ilium contour rotates clockwise; as seen from outside the body on the right side. It is incorrect to say that one or the other bone counternutates; it takes two bones to counternutate as they both move concurrently and relative to each other. 
Feb 17, 2014

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