アントンセンI法撮影の簡略化

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  • Synthesis of Two Angles in Anthonsen's Method

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The fracture of the calcaneus frequently involves the surface of the posterior talocalcaneal joint. Therefore, the Anthonsen position, which is effective for visualizing the posterior talocalcaneal joint surface, should always be indicated in patients suspected of fracture of the calcaneus. The Anthonsen I position, however, requires x-ray irradiation at an angle of 25° in the head and caudal directions and at 30° in the dorsoventral direction, which frequently results in the need for repeated x-ray examinations due to orientation errors. An alternative approach is to conduct x-ray examination using a tilting table adjusted to an angle of 25° or to carry out x-ray examination at a position of 45° heel lift. The adoption of these techniques enables relatively unconstrained visualization of the talocalcaneal joint, although x-ray examination in the heel lifting position may cause stress to patients suffering post-traumatic pain. The reproducibility of post-traumatic, preoperative and postoperative projections, however, is poor. As a solution to these problems, we have developed a new x-ray examination technique. The incident x-ray angle has been simplified by synthesizing the two angles used with the Anthonsen I position. Furthermore, the position of the foot is determined by means of an auxiliary projection device. Our simplified version of the Anthonsen I position reduces the number of projection processes and does not require the patient to adopt an awkward position. In addition, this modified technique enables the visualization of the posterior talocalcaneal joint surface as clearly as with conventional x-ray examination.

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