. Radiography, X-ray therapeutics and radium therapy . he forearmflexed or extended. Good pictures of the head of the radius and its articulation can beobtained by slightly flexing and pronating the forearm. The Radius and Ulna should always be taken in two positions : (1)lateral, (2) antero-posterior. The Wrist-joint must always be examined in two planes, the antero-posterior and the lateral. In both positions the tube is centred over thecarpus. Compression on the limb may be effected by using a long extensiontube, pads of lambs wool being applied over the part, or sand-bags may beused to ste
. Radiography, X-ray therapeutics and radium therapy . he forearmflexed or extended. Good pictures of the head of the radius and its articulation can beobtained by slightly flexing and pronating the forearm. The Radius and Ulna should always be taken in two positions : (1)lateral, (2) antero-posterior. The Wrist-joint must always be examined in two planes, the antero-posterior and the lateral. In both positions the tube is centred over thecarpus. Compression on the limb may be effected by using a long extensiontube, pads of lambs wool being applied over the part, or sand-bags may beused to steady the limb. Metacarpal Bones and Phalanges.—These frequently call for care-ful examination. Antero-posterior and lateral pictures may readily beobtained, but lateral pictures of the middle metacarpal bones are verydifficult to obtain. The hand is placed obliquely on a plate, and the tubedirected well in front of the middle line. The picture is somewhat views of the phalanges can be procured by placing a plate betweenthe PLATE VI.—Normal Shoulder-joint. a, Normal shoulder-joint, plate on posterior aspect of , Normal shoulder-joint, plate on anterior , Normal shoulder-joint, arm abducted. THE LOWER EXTREMITY 135 The Lower Extremity The bones of the pelvis are seen in most of the radiographs taken for thebladder and ureters. The sacrum is readily shown by putting a plate beneaththe patient, and using a compression tube from above. In large pictures ofthe region the acetabula with the head of the femur are well shown. When the two joints are required for comparison, a good method is toradiograph the lower pelvis, centering the tube just below the symphysispubis. Good detail is obtained of the head of the bones, and a good outlineof the acetabulum. The iliac bones, which often require to be radiographed for fracture,tumour, etc., may be examined in two positions, with the tube centred overthe middle of each bone, from the front. The H
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