Objectives: To outline two surgical strategies for managing traumatic incudostapedial joint disar... more Objectives: To outline two surgical strategies for managing traumatic incudostapedial joint disarticulation (ISJD) with intact tympanic membrane (TM), aiming for improving the stability and the functional outcomes of the procedure.Methods: This randomized controlled clinical trial was performed on 27 ears of 27 patients with isolated traumatic ISJD with intact tympanic membrane. The study was conducted in the Otorhinolaryngology Department, Mansoura University Hospitals, Egypt. Patients were randomly assigned into two groups: anatomical reconstruction group (n=14), and stapes bypass group (using a Teflon piston) (n=13). Air and bone conduction thresholds at frequencies 500–4000 Hz, were determined pre- and postoperatively.Results: The postoperative pure-tone average and mean air-bone gap (ABG) were statistically significantly different (p < 0.001). The mean postoperative gain of air conduction (AC) threshold and consequently the mean postoperative ABG closure were significantly b...
The rotor critical speeds are the speeds accompanied by a great dynamic load, and maximum vibrati... more The rotor critical speeds are the speeds accompanied by a great dynamic load, and maximum vibration. The critical speeds of rotation coincide with the natural frequencies of transverse vibration of the non-rotating shaft disc system. These speeds should be determined carefully. In this paper, the critical speeds of a shaft-discs system are calculated using several methods. Firstly, Raleigh's method, and transfer matrix method are used to calculate the first and the second critical speeds using MATLAB software. Secondly, the critical speeds are calculated by finite element method using ANSYS package. Finally, an experimental investigation is done to determine the values of critical speeds. The experimental results are presented in comparison with the calculated values.
Objectives: To outline two surgical strategies for managing traumatic incudostapedial joint disar... more Objectives: To outline two surgical strategies for managing traumatic incudostapedial joint disarticulation (ISJD) with intact tympanic membrane (TM), aiming for improving the stability and the functional outcomes of the procedure.Methods: This randomized controlled clinical trial was performed on 27 ears of 27 patients with isolated traumatic ISJD with intact tympanic membrane. The study was conducted in the Otorhinolaryngology Department, Mansoura University Hospitals, Egypt. Patients were randomly assigned into two groups: anatomical reconstruction group (n=14), and stapes bypass group (using a Teflon piston) (n=13). Air and bone conduction thresholds at frequencies 500–4000 Hz, were determined pre- and postoperatively.Results: The postoperative pure-tone average and mean air-bone gap (ABG) were statistically significantly different (p < 0.001). The mean postoperative gain of air conduction (AC) threshold and consequently the mean postoperative ABG closure were significantly b...
The rotor critical speeds are the speeds accompanied by a great dynamic load, and maximum vibrati... more The rotor critical speeds are the speeds accompanied by a great dynamic load, and maximum vibration. The critical speeds of rotation coincide with the natural frequencies of transverse vibration of the non-rotating shaft disc system. These speeds should be determined carefully. In this paper, the critical speeds of a shaft-discs system are calculated using several methods. Firstly, Raleigh's method, and transfer matrix method are used to calculate the first and the second critical speeds using MATLAB software. Secondly, the critical speeds are calculated by finite element method using ANSYS package. Finally, an experimental investigation is done to determine the values of critical speeds. The experimental results are presented in comparison with the calculated values.
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Papers by Mohamed Ghonim