[Mechanical properties of the bone tissue of the femur head]. / Mekhanicheskie svoistva kostnoi tkani golovki bedrennoi kosti.

The authors have perfected the method of determining the firmness of elastic biological tissues. The values of firmness of the cartilaginous and spongy tissues in radial directions and in normal planes have been studied including the directions that coincided with the action of the resultant force on the femoral head. It is possible to make a conclusion that areas possessing equal firmness are situated at the same distance from the centre of the joint, while the higher firmness areas alternate with the spherical lower firmness areas. A suggestion is made that such mechanical structure improves the properties of the femoral head.

[Role of mechanical factors in the development of degenerative dystrophic lesions of the hip joint]. / K voprosu o roli mekhanicheskikh faktorov v razvitii degenerativno-distroficheskikh porazhenii tazobedrennogo sustava.

The authors present the results of their studies of distribution of pressure on the articular surfaces of the hip joint with regard to the value of the angle between the femoral neck and the diaphysis and the state of the cartilaginous coat. The regularity of distribution of pressure was studied on a real model of the hip joint by means of tensometry and ichnography. It was established that the region of maximum pressure was most frequently affected by degenerative dystrophic process, and the epicenter of pressure on the femoral head surface was shifted due to an increased or decreased angle between the femoral neck and the diaphysis directed laterally or medially as compared with the normal state. These peculiarities should be taken into consideration when performing corrective osteotomies.