REVIEW FROM JANUARY NUMBER ANNALS OF SURGERY. 
75 
The tibia was placed in a vise and a weight hung on the foot in 
such a manner that part of the weight was supported by the 
os calcis and the balance by the anterior part of the tarsal bones. 
Upon dissection it was found that there was a fracture of the 
calcaneum, involving the surface, articulating with the astragalus. 
The ligaments were not torn. 
Experiment No. 9 was similar to No. 4. Dissection of the 
parts in question showed no rupture of the patellar ligament, but 
rupture of the bony tissue to which it was attached. 
In experiment No. 10 the tendon of the tibialis anticus was • 
isolated and torsion was applied in the usual manner. Dissec¬ 
tion showed no tendon injury but a tearing of the bone to which 
the tendon was attached. 
In experiment No. 11, after removing the skin from the right 
ankle-joint, the tendon Achilles was cut and the distal end grasped 
in a vise and a weight applied in the usual manner. The foot 
was also placed in a vise. Vise No. 1 slipped from the tendon, 
apparently isolating three parts. The experiment was repeated 
on that part of the tendon which was overlapped by the other 
part of the tendon. Upon dissection it was found that the bony 
structure of the posterior surface of the os calcaneum was rup¬ 
tured apart, coming away with the tendon. This portion of the 
tendon last tested was uninjured. 
Experiment No. 12 was conducted in a like manner as No. 8 
Upon applying the pulling force the hook slipped from its attach¬ 
ment. Upon dissection it was found that the anterior band of 
the external lateral ligament of the ankle had pulled away some 
bony tissue at its point of attachment to the astragalus. There 
was no injury to the ligaments. 
Experiment No. 13 was performed in like manner to No. 3. 
Upon dissection it was found that the semi-membranous tendon 
had pulled away a portion of the bony tissue at the point of at¬ 
tachment. There was no injury to the ligament. 
Experiment No. 14 was a repetition of No. 4. Dissection 
showed no injury to the patellar ligament, which was shown to 
have pulled away bone tissue at the point of its attachment. 
