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A material of 15 cases of histologically examined pyrophosphate arthritis (hip-joint: 7 cases, knee joint: 8 cases) is presented. Amyloid deposits were found in 14 cases and chondromatosis in the subsynovial connective tissue of all the cases. The significance of this high, not previously reported, coincidence is discussed, together with various pathogenetic possibilities, as related to the theories of the genesis of amyloid substance.
Teglbjærg et al. (Sun,) studied this question.