116 Injuries of Bone. 



The fractured specimen shows the impaction of the neck 

 upon the trochanter. The neck has given way at the usual 

 place, but its anterior broken margin, instead of, as in Nos. 3. 191 

 and 192, being forced in front of the corresponding margin 

 of the lower fragment, has been forced behind it, so as to be 

 •embedded in the upper end of the bone. These two modes of 

 union thus each leave a ledge at the line of junction in front. 

 It is more usual, however, to find an angle there — see Nos. 3. 193 

 to 198. 



The section of the bone shows the restoration of the 

 cancellous tissue except at two points, above and below, where 

 the bone is condensed. The tip of the trochanter is on a some- 

 what higher level than that of the head. The section of the 

 sound side shows a certain amount of absorption of the cancellous 

 tissue due to old age, but the angle of the neck seems in no way 

 altered. G. C. 3662. 



Presented by H. Alexis Thomson, F.R.C.S.E., 1892. 



3. 200. United Impacted Extra-capsular Fracture of the 



Neck.— Upper end of a right femur — macerated, showing the 

 above. A section has been made of the head and neck to show 

 the interior of the bone. 



The neck has given way, as is usual in this fracture, at its 

 junction with the shaft. The small trochanter has been 

 split off. 



The tip of the great trochanter is above the level of the 

 head, and the linea aspera is directed inwards, hence there 

 must have been marked shortening and eversion. 



The head of the bone shows changes like those produced by 

 arthritis deformans, a disease which often attacks injured joints 

 in old people. The bony union is complete. As in the 

 previous specimen, the upper fragment has been forced behind 

 the lower, leaving a similar ledge shelving backwards from the 

 lower fragment to the upper. 



This specimen is figured in Bell's "Observations on Injuries of 

 Spine and Thigh Bone," plate vii. fig. 2. 



B. C. I. 1. 20. a. 



