Abstract
34 coal miners, who were working with the percussion hammer, were examined by radiograph and 21 of them were found some changes of bones and joints of their upper limbs.The locations of the changes were as following table;The conclusions are as follows;i. The changes are most frequent in elbow joints.ii. The changes are encountered more frequent and severer in the right arms.iii. The degrees of changes are proportional to the duration of use of machines, but disponsition of patients cannot be neglected.
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