Ok now this has to be an error - was going through the MusculoSkeletal chapter in RR and in the blue notes in the margin it says -
Osteoporosis:most common Metabolic Abnormality of bone Pg -516 , and then again on pg-518 in the blue notes - it says - Aseptic Necrosis:Most common metabolic abnormality of bone
Both can't be the most common
I checked the Errata and there is no correction/explanation for this in there
(I have the first printing of the 3rd edition )
@Altruist , does the 2nd printing have this point corrected?