An investigation of the possible inverse relationships between the occurrence of rheumatoid arthritis, osteoarthritis and schizophrenia.

One hundred and eleven inpatients with schizophrenia and 51 with other psychiatric conditions were compared for the frequency of rheumatoid arthritis, other connective tissue disorders and other physical illness. Evidence both of rheumatoid arthritis and osteoarthritis was significantly less in the schizophrenia group. Latex Agglutination Tests were positive to the same extent in both groups. One possible explanation of the findings is that they are due to the reduced frequency of trauma or stress to the joints in schizophrenic inpatients, many of whom lived in hospital, compared with the control group. Other explanations are also considered.