THE SUBSTANTIATION OF EARLY SURGICAL TREATMENT OF CONGENITAL PATELLA DISLOCATION

The present work is based on the results of congenital patella dislocation treatment in patients aged from 4 months to 18 years old (average 10,6±0,7 years). The results were estimated in the period ranged from 1 to 40 years (average 15,1±2,1 years). The new classification of congenital patella dislocations was based on the gait biomechanical parameters. The necessity of early surgical treatment of congenital patella dislocation has been proved

Surgical Hip Dislocation Technique in Treatment of Patients with Slipped Capital Femoral Epiphysis

Purpose: to evaluate the efficiency of modified Dunn procedure for treatment of severe slipped capital femoral epiphysis.Material and Methods. The authors used the modified Duim procedure for treatment of 6 patients with SCFE aged from 10 to 13 years and displacement degree over 55°. Chronic disease form was reported in one patient, acute displacement along the chronic process was reported in 5 patients. All patients had a stable form of SCFE by Loder classification. Surgical procedure was performed within 6 to 12 months from the onset of disease.Results. Normal anatomical relations in the hip joint were restored in all patients. During follow up from 18 until 48 months the patients did not demonstrate aseptic femoral head necrosis or chondrolysis. Adolescents did not complain on pain or hip motion limitations. Treatment outcomes assessment by Harris hip score was 97 points.Conclusion. Based on outcomes of the modified Durm procedure the authors conclude that the method provides for complete restoration of the anatomical relations between femoral neck and epiphysis and, thus, the hip joint biomechanics. Femur dislocation allows to form an extended flap to ensure epiphysis perfusion which improves overall blood supply in the femoral head and consequently decreases the risk of aseptic necrosis and chondrolysi

Performance analysis of the sensorless adaptive sliding-mode neuro-fuzzy control of the induction motor drive with MRAS-type speed estimator

This paper discusses a model reference adaptive sliding-mode control of the sensorless vector controlled induction motor drive in a wide speed range. The adaptive speed controller uses on-line trained fuzzy neural network, which enables very fast tracking of the changing speed reference signal. This adaptive sliding-mode neuro-fuzzy controller (ASNFC) is used as a speed controller in the direct rotor-field oriented control (DRFOC) of the induction motor (IM) drive structure. Connective weights of the controller are trained on-line according to the error between the actual speed of the drive and the reference model output signal. The rotor flux and speed of the vector controlled induction motor are estimated using the model reference adaptive system (MRAS) – type estimator. Presented simulation results are verified by experimental tests performed on the laboratory-rig with DSP controller