196 Injuries of Joints. 



A strong band of fibrous tissue unites the under surface 

 of the remains of the neck of the femur with the upper part 

 of the old acetabulum. B. C. ii. M. 13. 



5. 15. Unreduced Thyroid Dislocation. — Plaster cast of a left 



innominate bone and upper end of the corresponding femur, 

 showing the above. The head of the bone has formed for 

 itself in the thyroid foramen a new socket, which has 

 encroached upon the acetabulum. G. C. 1931. 



Presented by J. A. RoBErvTSON, F.R.C.S.E., 1838. 



DISLOCATION OF THE PATELLA. 



5. 16. Outward Dislocation of the Patella.— Condyles of a 



left femur, with a greatly altered patella — macerated, showing 

 the above. 



The condition has evidently been of many years' standing. 

 The articular surfaces of the femur are irregular, and much new 

 bone has been thrown out round the margins. The anterior 

 surface of the patella is unchanged, but on the posterior or 

 articular surface a large mass of new bone has been formed, and 

 has adapted itself to its new position on the outer condyle 

 withou^t adhering to it. Many of the changes seen on the 

 articular surfaces of the femur resemble those found in arthritis 

 deformans. B. C. n. M. 27. 



5. 17. Vertical Dislocation of the Patella.— Plaster of Paris 



cast of a right knee, showing the above. 



The patella has been twisted, so as to rest upon its outer 

 edge against the trochlear surface of the femur. G. C. 2477. 



Presented by C. Darutt, L.R.C.S.E. 



