Immediately below the dorsal swelling there is a well marked sulcus, deepest internally below the head of the ulna, directed nearly transversely, but ascending a little as it approaches the radial border of the forearm. It generally occurs in consequence of a fall upon the back of the hand, and the situation of the fracture is from half an inch to an inch above the articulation it is accompanied by great deformity, the principal features of which are a dorsal and a palmar tumour, and a striking projection of the head of the ulna at the posterior and inner part of the forearm the dorsal tumour occupies the entire breadth of the forearm, but is most conspicuous internally, where it is constituted by the lower extremity of the ulna displaced backwards from this point, the inferior outline of the tumour passes obliquely upwards and outwards, corresponding in the latter direction of the lower end of the superior fragment of the radius. Colles fractures There may or may not be concomitant volar displacement Smiths fractures are typically sustained after a fall onto a flexed wrist, rather. A Colles fracture requires the wrist be extended during the injury, while a fall on a flexed wrist would result in something called a Smith’s fracture. This is an injury of exceedingly rare occurrence, and one which presents characters closely resembling those of dislocation of the carpus forwards. A lateral view shows the fragment to be displaced and tilted anteriorly - the opposite of a Colles fracture. What causes a Colles fracture Colles fractures are most common as the result of a fall on an outstretched hand, or as the result of trauma. In this tome Smith also described the variation of wrist fracture whereby the distal fragment is displaced in a volarwards (as previously noted by Goyrand). However I have beneath my eyes two pathological specimens that present this fracture in the opposite direction…ġ847 – Robert William Smith described the characteristics of Colles fracture in his book – A Treatize on Fractures in the Vicinity of Joints and on Certain Forms of Accidents and Congenital Dislocations. Impact forces at the time of injury may compress trabecular bone, especially in older individuals with osteopenia. Unstable injuries are often the result of cortical comminution (dorsal with Colles fracture, volar in Smith fracture) (Fig. They trace, in general, an oblique direction from superior to inferior, and from the dorsal to the palmar face. Colles’ fracture: neutralization or reversal of the normal slight (10°). The fractures of the lower extremity of the radius can occur at different points along the length of this extremity. A Colles Fracture is a complete fracture of the radius bone of the forearm close to the wrist resulting in an upward (posterior) displacement of the radius and obvious deformity.
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