NOTE ON THE SUPERIOR TIBIO-FIBULAR JOINT. 

 By S. A, Owen, Trinity College. 



The structure which I am about to describe is an intra-articular 

 lamella shown on opening the tibio-fibular capsule. The struc- 

 ture in question appears to be fairly constant, being well 

 marked in 70 per cent, of the joints which I have examined. 



To remove the capsular ligament I find it best to carry the 

 knife along the upper and posterior margin of the superior 

 tibio-fibular articulation, in order to display this lamella to 



Fig. 1. — Right superior tibio-fibular articulation. The arrow head is inserted 

 into the pocket-like interval between the ligament {Liy.) and the sliaft of 

 r the bone. c. /</., capsular ligament. 



the best advantage. On drawing gently aside the fibula, one 

 cannot fail to notice, if the ligament is present, a well-defined 

 free crescentic border, the concavity of which looks upwards. 

 "This concavity is more marked in some cases than in 

 others. The attachments of the ligament are ias follows: — 

 Tlie tibial origin, in nearly every case, is well marked, and 

 is confined to the outer inferior margin- of the tibial facet for 

 'about half to three-quarters of an inch (see fig. 1). From this 



