NO. l8 ANTHROPOLOGICAL WORK IN PERU — HRDLICKA 6l 



articular surface of the condyles that showed the first lesions. The 

 initial lesions were gradually followed by more roughness of the 

 articular surface, associated with an augmentation of the marginal 

 exostosis ; and then, in the case of the condyles, followed the gradual 

 development of an abrasion-surface, grooved antero-posteriorly, 

 with more or less wearing off of the compact layer of the bones so 

 that some of the bone cavities beneath became visible, and with a 

 polishing of the abraded portion. 



Exostoses about the head of the femur came generally much later 

 than those about the condylar articular surfaces, if at all. 



In the tibia, changes corresponding to those in the femur developed 

 simultaneously on and about the upper articular surface ; and about 

 the same time, or later, the process began to manifest itself also in 

 other bones, especially the vertebrae and the humerus (lower end). 

 Not seldom the first and occasionally the only manifestation of the 

 disorder was manifest in the vertebrae, particularly those of the lum- 

 bar, lower dorsal and cervical regions. The material examined 

 seemed to show plainly that the cause which gave rise to the mani- 

 festations was constitutional. 



"TENDON LESION" 



This was evidently an inflammatory lesion, of varying extent, on 

 the posterior surface of the lower end of the femur, at and about 

 the insertion of the medial head of the gastrocnemius. 



It was quite frequent in the Chimu region on the coast, but was 

 not noticed in the mountains, though lighter grades may have 

 escaped attention. 



Not accompanied (except accidentally) by other pathological 

 conditions. 



Present occasionally in the adolescent, but not in children. 



Traumatic origin? 



