He says the collarbone does not come off from the inside, because it is connected to the sternum and therefore does not move on this side. If it is hit hard from the outside and it separates, then it is straightened out and treated in the same way as when it breaks.
As for the end of the clavicle, adjacent to the shoulder and separated from it, it does not dislocate often, because the biceps muscle does not allow this, and the glenoid cavity of the scapula also prevents this. The collarbone does not make strong movements, because it is installed only to move apart and expand the chest; therefore, among all animals, only humans have a collarbone. If the collarbone is dislocated during a struggle or anything like this, then the bone is set and brought into place by hand or by numerous compresses which are applied to the collarbone with a suitable bandage. This treatment is also suitable for the head of the humerus, when it is displaced, and is returned in this way to its place. The organ that connects the clavicle with the shoulder is the cartilaginous bone, and in thin people this leads to error, so that when it is displaced, the doctor, who has no experience, believes that the end of the humerus has broken off and left its container, for the articular end of the scapula seems then more sharp, and the place from which the bone came out seems concave. However, such dislocations must be differentiated based on conclusive evidence.