Discoloration accompanies the swelling, and is often widespread, especially in fracture of bones near the surface and when the tension is great. It is not uncommon to find over the ecchymosed area, especially over the shin-bone, large blebs containing blood-stained serum. In fractures of deep-seated bones, discoloration may only show on the surface after some days, and at a distance from the break.
Alterations in the relative position of bony landmarks are valuable diagnostic guides. Alteration in the length of the limb, usually in the direction of shortening, is also an important sign. Before drawing deductions, care must be taken to place both limbs in the same position and to determine accurately the fixed points for measurement, and also to ascertain if the limbs were previously normal.
Shock is seldom a prominent symptom in uncomplicated fractures, although in old and enfeebled patients it may be serious and even fatal. During the first two or three days after a fracture there is almost invariably some degree of traumatic fever, indicated by a rise of temperature to 99° or 100° F.
Complications.—Injuries to large arteries are not common in simple fractures. The popliteal artery, however, is liable to be compressed or torn across in fractures of the lower end of the femur; extravasation of blood from the ruptured artery and gangrene of the limb may result. If large veins are injured, thrombosis may occur, and be followed by pulmonary embolism.
Injuries to nerve-trunks are comparatively common, especially in fractures of the arm, where the radial (musculo-spiral) nerve is liable to suffer.
The nerve may be implicated at the time of the injury, being compressed, bruised, lacerated, or completely torn across by broken fragments, or it may be involved later by the pressure of callus. The symptoms depend upon the degree of damage sustained by the nerve, and vary from partial and temporary interference with sensation and motion to complete and permanent abrogation of function.
In rare instances fat embolism is said to occur, and fat globules are alleged to have been found in the urine. In persons addicted to excess of alcohol, delirium tremens is a not infrequent accompaniment of a fracture which confines the patient to bed.
Prognosis in Simple Fractures.—Danger to life in simple fractures depends chiefly on the occurrence of complications. In old people, a fracture of the neck of the femur usually necessitates long and continuous lying on the back, and bronchitis, hypostatic pneumonia, and bed-sores are prone to occur and endanger life. Fractures complicated with injury to internal organs, and fractures in which gangrene of the limb threatens, are, of course, of grave import.
The prognosis as regards the function of the limb should always be guarded, even in simple fractures. Incidental complications are liable to arise, delaying recovery and preventing a satisfactory result, and these not only lead to disappointment, but may even form a ground for actions for malpraxis.
The chief and most frequent cause of permanent disability after fracture is angular displacement. A comparatively small degree of angularity may lead to serious loss of function, especially in the lower limb; the joints above and below the fracture are placed at a disadvantage, arthritic changes result from the abnormal strain to which they are subjected, and rarefaction of the bone may also ensue.