Osseous Tumours. 353 



6. 377. Distortion of Bones by Multiple Exostosis.— Femur, 

 tibia, and fibula of a right leg ; with part of femur, tibia, and 

 fibula of the opposite side — macerated, illustrating the above. 



The articular ends of the shafts are greatly distorted by 

 exostoses, and the bones of the legs are fused. 



On the right side the femur has large irregular exostoses, 

 projecting all round the neck, especially behind and below, 

 where they have obliterated the small trochanter. The great 

 trochanter is not much changed, but below it a large irregular 

 mass of bone projects outwards, and while gradually tailing 

 off into the linea aspera below, runs into the mass at the lesser 

 trochanter in front. These masses of bone are composed of 

 cancellated tissue, with more or less enlarged spaces. The 

 articular surface of the head is rough and nodular below the 

 impression for the ligamentum teres, and the hip-joint has ap- 

 parently been anchylosed. The lower end shows numerous- 

 projecting spines and ridges, which are largest on the outside. 

 They do not follow the direction of any muscular fibres, and 

 the tip in most cases is exposed, probably from having been 

 covered with cartilage in the recent state. The tibia show& 

 at the inner and posterior parts of the head numerous knobby 

 and sp)inous projections similar to those on the lower end of the 

 femur. A bridge of bone unites the tibia with the fibula about 

 an inch below the level of the tubercle. The lower end of 

 the tibia shows several projecting spines and knobs, and is fused 

 with the lower end of the fibula. The shaft of the tibia shows 

 scarcely any change. There is no ossification in the interosseous 

 membrane, except one small spine on the tibia. The fibula is 

 wanting at its upper end, where it should have articulated 

 with the tibia, but below that place it is fused with it. Except 

 at one or two spots at either extremity, where there are 

 spinous projections, the shaft of the fibula is normal. 



On the left side the lower end of the femur has irregular 

 spinous projections similar to those on the right side. The 

 tibia and fibula are affected similarly, but more extensively 

 than those of the right side. The upper end of the tibia is 



