If authors be consulted, they will be all found to agree, in considering the communication of fractures with a joint as a complication of a very serious nature. A swelling of the adjacent parts, their inflammation, a continuance of the pains after the reduction, extensive abscesses, a gangrene even of the soft parts, and a caries of the bones; such, according to these authors, are the almost inevitable consequences of these kinds of fractures, of which an anchylosis is the most favourable termination that can be expected. Petit, Heister, and Duverney, do not describe the evils that accompany these accidents. Pare, in speaking of them, says, “In such cases, the violence done to the tendons generally gives rise to great inflammation.” 9. From whence can arise these exaggerated fears? Can it be, as is pretended, the mere communication of the fracture with a joint, that is productive of such serious affections? What relation, then, can reason discover between the cause and the effect? Does not experience answer in other cases, in a manner that admits of no reply, when it furnishes us with the analogy of fractures of the rotula, the olecranon, &c.? Modern researches have entirely abolished the ancient theory of an effusion of callus into the joint, and with it one of the principal causes assigned by writers for the accidents and evils which they so much dreaded. The admission of air into an articular cavity, would be, without doubt, in such cases, a consideration of more weight; but this does not occur except in fractures accompanied with wounds, and yet all those in the vicinity of joints, whether compound of not, are regarded as extremely dangerous. Besides, observation has oftentimes proven to Desault, that even the contact of air is not so dangerous as it has been commonly supposed, and many instances occurred to him in his practice, where, notwithstanding such a complication, a perfect cure was obtained. 10. It is, then, to the want of a skilful mode of treatment, and to the irritation experienced in the parts, in consequence of an ill-constructed apparatus being applied to them, that the accidents formerly mentioned (8) ought to be attributed. Such accidents never occurred to Desault, in any of the numerous cases that fell under his care. It is thus that in the fracture of the neck of the os femoris, the insufficiency of the means, is oftentimes productive of unfavourable results. § III. OF THE REDUCTION, AND THE MEANS OF MAINTAINING IT.