A biomechanical aspect of the lumbal approach to the kidney

Functional differences between surgically attacked musculature of the lumbal region and intact musculature of the contralateral side were assessed in 71 patients by the method of Multić-Labar, Moire topography, electromyography and X-ray analysis of the thoraco-lumbar spine. The following conclusions were derived from the results obtained. In the intact musculature of the lumbal segment of the spine, sliding forces reached 200 kN in males an 170 kN in females aged >25 and <30 years. In younger and older age groups, the values were lower, assuming a form of the ascending and descending limb of a parabole, respectively. Upon healing, the lumbal musculature damaged by surgical resection showed decreased values of the pulling and sliding forces by 15 and 25 kN on an average, respectively, as definite values independent of age and sex. Kinematic alterations included myogenic geneses of a stationary form, with normal innervation, involving the whole damaged musculature. Summa summarum, results of analyses suggested the values of kinematic forces of pulling and sliding forces of the musculature damaged by surgical resection to be definitely significantly reduced, thus confirming the premise of the study.