In a radiographic survey of the pelvic areas of 160 parapl egics we found two main groups of abnormalit ies: (1) the socalled para-ost eo-arthropathies, (2) true arthropathic changes in the sacroiliac joints. Dejerine, Ceillier, and Dejerine (1) coined the term “para-osteo-arthropathies” to describe bony erosion, soft ti ssue calcification, and ossification in their series of paraplegic casualties of World War I. The term has been revived, and the studies expanded in severa l series of World War II patients (2, 3). The bony erosions of the femoral trochanters, ischial tuberosities, and other bony promontories have been ascribed to pressure necrosis and osseous devitalization secondary to decubiti. The soft-tissue calcification and ossification in the buttocks and about the hip joints have also been ascrib ed to decubiti, but a neurogenic factor may also be involved (2). Another factor to be considered is the abnormal mobiliz ation and deposition of skeletal calcium in the bedridden patient (3). True joint changes in these patients, in the apophyseal and sacroiliac joints, have been described only recently in the literature (4). Brailsford (5, 6) pointed out that the joint surfaces of the femora and acetabula are characteristically uninvolved and Charcot joints do not occur. In our series definite sacroiliac joint changes were noted in 98 cases, or about 61 per cent. The changes varied from minimal para-articular rarefaction and narrowing of the joints to apparently complete bony fusion. In 28 patients the findings were classed as slight, although definite; in 26 the changes were moderately to markedly severe, while in 44 complete or almost complete bony fusion was present bilaterally. The sacroiliac films were in many cases quite suggestive of a rheumatoid arthritis of the Marie-Strumpell type. The spine films in our series, however, are usually free of abnormalities, except for the vertebral fractures and immediate secondary changes. In all of our patients parapl egia was due to fractures of the spine and spinal cord section or to cauda equina injury. In all but three the injuries occurred as a result of rock falls and cave-ins in coal mines. The miner characterist ically works in a semicrouched position, which serves in part to explain why the vertebral fractures occurred at the T-12 to L-1 level in 80 per cent of our cases. The site of the residual central nervous system lesion was quite variable, extending from the mid-thoracic to sacral level. Low back pain is an occupational complaint of coal miners due to the crouched working position. Roentgenographic examination by compensation physicians, however, does not disclose any increased incidence of sacroiliac arthritis (7). Figures 1, 2, and 3 show three representative cases, with brief histories. Additional films were exhibited at the Thirtyfourth Annual Meeting of the Radiological Society of North America (8).