240 



Sir W. Mace wen. 



[June 6, 



Dog J. — Preservation of Periosteum, Removal of Part of Shaft and Protection 

 of Medullary Tissue and Divided Ends of Bone. 



The periosteum from the right radius was elevated, carefully preserved and 

 left intact. There was no attempt made to free the periosteum from plaques 

 of bone which may have adhered to it during separation. 2f of the denuded 

 shaft of the right radius was then removed and put aside. In its place a 

 perforated, decalcified turkey bone drainage tube was inserted into the gap 

 in the shaft under the periosteum. The proximal and distal portions of the 

 shaft with their open medulla were introduced into either end of the turkey 

 bone tube with the hope that any extrusion of ossific matter, either from the 

 divided ends of shaft or from the medulla, would be thus preserved from the 

 pressure of the surrounding tissues and be permitted to grow. 



Almost bloodless. Aseptic healing, no visible scar and no adherent cicatrix. 

 Dog ran about a great deal, and ulna became bent from lack of support 

 of radius. 



Description of Specimen as seen 10 Weeks after. — The ulna was found bent 

 at junction of middle and lower thirds. In the part of the radius from which 

 the shaft had been removed there was no apparent trace of periosteum or 

 decalcified turkey bone tube, but where the tube had been placed there was a 

 dense mass of fibrous tissue about \ inch in thickness, which covered the 

 underlying osseous tissue, and adhered to the ulnar periosteum. This 

 connective tissue mass was continuous superficially with the periosteum on 

 the shaft above and below the part from which the bone had been removed, 

 while at its deeper part it was connected with the two extremities of the old 

 shaft and with portions of new bone projecting from the cut edges of the old, 

 which had formed an irregular bridge between the two cut osseous surfaces, 

 measuring 1£ inches in length, and from \ to § inch in breadth. On the 

 proximal side of this bridge there was a very thin osseous layer adhering to 

 the ulna, and to the upper part of radius, the remainder of the gap being 

 made up of dense fibrous tissue. 



The difference in length between the right radius and the left radius 

 is | of an inch — the measurement being in a straight line (5| left; 

 4f right). 



Dog K. — Preservation of Per iosteum and Removal of Bone. 



Shaft of radius removed sub-periosteally to the extent of If inches; the 

 periosteum being carefully preserved and being left in situ. There was no 

 attempt made to detach plaques of bone which might have adhered to the 



