Biomechanical malfunction of the knee extensor mechanism in the patello femoral joint is regarded as patella malalignment but major patients complaints are anterior knee pain and patellar slipping. Lateral retinacular release is one of the basic surgical procedures in the treatment of patellar malalignment. The aim of the study was to estimate the achievements of the lateral retinacular release in solving particular biomechanical disorders of the patello femoral joint, as well as individual patients complaints. Evaluation of objective parameters x-ray and clinical findings before and after the operation, shows statistically highly significant difference, thus confirming implementation of the fore mentioned surgical procedure. Despite the fact that anterior knee pain subsided postoperatively in the number of patients, statistically significant values, comparing to the preoperative findings, could not be obtained. Incidence of the patellar slipping has shown statistically significant reduction two years following the surgery. Achieving proper biomechanical alignment of the patello femoral joint is obviously not sufficient to provide relief of subjective complaints, especially concerning anterior knee pain, although considerable improvements were registered in the number of patients.