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The electromyographic activity characteristics of the gluteus medius muscle before and after total hip arthroplasty

Kopeć Konrad, Bereza Przemysław, Sobota Grzegorz, Hajduk Grzegorz, Kusz Damian

Acta of Bioengineering and Biomechanics

2021

Vol. 23, no. 1

187--195

Purpose: The clinical outcomes of total hip arthroplasty are influenced by the correct muscle function that determines good, longterm and proper function of the artificial joint. The aim of the study was to analyze the electromyographic activity of the gluteus medius muscle in patients with hip osteoarthritis and after arthroplasty in various static weight bearing conditions, both on the affected and contralateral side. Methods: The prospective study involved 70 patients qualified for hip replacement. Patients underwent a surface electromyography of the gluteus medius muscle which involved the Trendelenburg test. The normalized results were obtained for both hips, preoperatively and 6 months after arthroplasty. Results: The only muscle activity differences were found at a full load condition of lower limb. In the preoperative assessment, the activity of the gluteus medius muscle was greater on the side qualified for surgery. After arthroplasty and the rehabilitation period, the muscle activity on the operated side decreased and significantly increased on the contralateral side. Detailed analysis of the contralateral side revealed relationship with osteoarthritis. Previous hip arthroplasty of that side resulted in lower muscle activity, similar to fully functional joints. Conclusion: The activity characteristics of the gluteus medius muscle vary depending on the condition of the joint, and the characteristics change as a result of the surgical procedure performed on both the operated and contralateral sides. These dependencies should be taken into account in the rehabilitation process, especially at the side opposite to the operated one.

City branding with stakeholders’ participation

Pawlak Katarzyna, Hajduk Grzegorz

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

2019

z. 139

461--475

The article is devoted to city branding. The work presents an outline of the concept and a model of city branding, as well as identifies the brand determinants, relevant for the design and examination of the brand. In the concept and the model presented, the impact of stakeholders on city branding and their role in the image building have been highlighted. The subject of the survey, carried out on a sample of the residents of the city of Rzeszów and the neighboring municipalities, concerned the city’s image. Multi-factor analysis was used to analyze the data. The obtained study results allowed for identification of four factors associated with the intangible and the tangible features of the city. The article fills up the gap in the research on the image of Polish cities. It contributes to the understanding of the way, in which city brands are assessed by their stakeholders, and constitutes a guide to the local government practice regarding the orientation of city positioning.