A system of surgery . is insufficient to stretch theanterior radio-carpal ligament greatly; but experi-ments on the cadaver and a few cases show thatthe fracture may be produced by over-extensionof the wrist, though sometimes the ligament yields. The dislocationof the lower fragment upon the upper may be maintained either byimpaction or by spasm of the radial carpal and thumb a very few recorded instances falls on the back of the handand flexion of the wrist have caused a similar fracture with dis-placement forwards of the lower fragment. Signs.—There may be no deformity; but when
A system of surgery . is insufficient to stretch theanterior radio-carpal ligament greatly; but experi-ments on the cadaver and a few cases show thatthe fracture may be produced by over-extensionof the wrist, though sometimes the ligament yields. The dislocationof the lower fragment upon the upper may be maintained either byimpaction or by spasm of the radial carpal and thumb a very few recorded instances falls on the back of the handand flexion of the wrist have caused a similar fracture with dis-placement forwards of the lower fragment. Signs.—There may be no deformity; but when the displacementis maintained the appearance is very characteristic. Seen from theradial side, the hand and fingers are more or less flexed, but theoutlines about the wrist are irregular; at the flexor fold there is adeepish depression, and above it is a prominence—the lower end ofthe upper fragment; on the dorsal aspect, opposite the latter, orrather higher, is a depression due to displacement back of the lower. ?Antero-Poste-rior Section through aRadius from a Case ofColles Fracture. Thedisplacement back androtation (moderate) ofthe lower fragment areshown; the angle for-wards above the wristcan be estimated andcontrasted with thatJin Fig. 26S. (Univer-sity College Museum,No. 213.) 830 INJURIES OF BONES.
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