. Röntgen ray diagnosis and therapy . paralysis. The pro-truding portion is chis-elled off after the perios-teum is carefully liftedfrom it. Then the com-pressed nerve must befreety exposed and prop-erly replaced. The peri-osteum is united withthin catgut. Conclusionsupon the anatomical con-dition of the compressedarea can be drawn by the faradic test, which, by proving the in-tegrity of the nerve below the injured portion, promises the course of time, however, degenerative processes may be ex-pected. Still, even under such circumstances, restoration is ob-served after the relie
. Röntgen ray diagnosis and therapy . paralysis. The pro-truding portion is chis-elled off after the perios-teum is carefully liftedfrom it. Then the com-pressed nerve must befreety exposed and prop-erly replaced. The peri-osteum is united withthin catgut. Conclusionsupon the anatomical con-dition of the compressedarea can be drawn by the faradic test, which, by proving the in-tegrity of the nerve below the injured portion, promises the course of time, however, degenerative processes may be ex-pected. Still, even under such circumstances, restoration is ob-served after the relief of pressure. Pressure may also be caused by the formation of callus orfibrous adhesions. In the great majority of cases the radial nerveis compressed. Sometimes the nerve is found embedded in a regu-lar osseous canal or tunnel, in which case Nature had admirablytried to create a special protection against compression. In a caseof this kind surgical interference appears necessary only whenthe nerve is kinked at its entrance or Fig. 238.—Diastasis of Fragments Caus-ing Pressure upon the MusculospiralNerve. TREATMENT OF DEFORMED FRACTURE 317 Interposition of a nerve between the ends of the bone frag-ments is another cause of neuritis or paralysis. Its frequencyseems to be entirely underestimated. The musculospiral (radial)nerve, especially, shows a great tendency to interposition, whichfinds its explanation in the spiral track in which it winds aroundthe bone (compare Figs. 1 t2, 14:5, and ^38). Similar dispositionsare shown by the peroneal nerve. If the contusion of the nerve is not severe, and the incarcera-tion insignificant at the time the fracture is sustained, symptomsof neuritis or paralysis may be postponed until further consolida-tion of the fragments includes the nerve in callous tissue. Nerve interposition may be suspected whenever there is intensepain or numbness in the range of its course. By pushing the lowerfragments towards the upper in a vertical direc
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