Radiographic evaluation of the results of total hip arthroplasty with the cementless Zweymüller endoprosthesis
Journal Title: Ortopedia Traumatologia Rehabilitacja - Year 2010, Vol 12, Issue 4
Abstract
AbstractBackground Cementless endoprostheses include the Zweymüller endoprosthesis. Extensive clinical and radiological investigations were carried out in the Department of Orthopaedics and Traumatology of the University of Medical Sciences in Poznań in 180 patients who had received this endoprosthesis between 1995 and 2004.Material and Methods The study group was composed of 180 patients (252 hips), out of whom 138 patients (193 hips) had been operated on due to primary (idiopathic) degenerative changes and 42 patients (59 hips) had needed treatment on account of degenerative changes secondary to developmental hip dysplasia and hip joint dislocation. The mean duration of post-operative follow-up was 6 years in patients with primary degenerative changes and 7 years in patients with secondary degenerative changes. The patients were also divided into two groups according to the length of post-operative follow-up. The first group, evaluated after a follow-up of more than 10 years, was composed of 31 hips, whereas the second group, with a follow-up of up to 10 years after the surgery, comprised of 221 hips. We evaluated anteroposterior hip joint radiographs taken before the surgery, during the follow-up and at the final examination and, additionally, axial hip radiographs taken on the first post-operative day and lateral radiographs of the femur and the hip joint taken at the final examination. The radiographic evaluation was carried out according to the recommendations of the Hip Society.Results There was no radiographic evidence of implant loosening among the 180 patients. In the group of post-dysplastic hips, the inclination angle of the acetabular component was 29-52° (mean: 40.2°) and the acetabular opening angle was 0-21° (mean: 7.9°). The stem was valgus-oriented in 9 hips, varus-oriented in 11 hips and neutral-oriented in 39 hips. In the group of patients with primary degenerative changes the inclination angle of the acetabular component was 29-65° (mean: 42.5°) and the opening angle was 0-32° (mean: 8.9°). The stem was valgus-oriented in 12 cases (6.3 %), varus-oriented in 43 cases (22.6%) and neutral-oriented in 138 cases (71%). There were no statistically significant differences between the group of patients treated due to idiopathic degenerative changes and those treated on account of post-dysplastic patients as well as between the groups divided according to the length of the follow-up as regards the position, the inclination and opening angle of the acetabular component, and the position of the stem.Conclusions The Zweymüller Alloclassic endoprosthesis provides good stability of the acetabular component and the stem in the treatment of both primary and post-dysplastic degenerative changes. The Zweymüller stem provides good conditions for the integration of bone surface with the endoprosthesis, while the acetabular component facilitates the remodelling of the bone surrounding the implant.
Authors and Affiliations
Krzysztof Pietrzak, Zbigniew Piślewski, Wojciech Strzyżewski, Andrzej Pucher, Wiesław Kaczmarek
Keywords
Related Articles
- EP ID EP57026
- DOI -
- Views 95
- Downloads 0
Subcutaneous Achilles tendon lengthening in the treatment of spastic equinus contracture
Background. Despite the significant progress in medicine in recent years, the number of children with cerebral palsy world-wide is growing systematically, often causing treatment problems. The goal of the present study w...
Wpływ 12 tygodniowego treningu izokinetycznego na moment siły prostowników i zginaczy kolana u chorych po rekonstrukcji więzadła krzyżowego przedniego przy pomocy zginaczy
W pracy dokonano oceny momentu siły zginaczy (ZK) i mięśnia czworogłowego uda (QM) po 12 i 24 tygodniach od rekonstrukcji izolowanego uszkodzenia więzadła krzyżowego przedniego (WKP) zginaczami kolana. Badaniu poddano 20...
Grzyby i bakterie jako czynniki patogenne w procesie gojenia się ran u chorych po zabiegach ortopedycznych
Wstęp: Zaburzenie prawidłowości gojenia rany operacyjnej opóźnia lub ogranicza wdrożenie leczenia usprawniającego. Próbując określić przyczynę utrudnionego gojenia poszukuje się zwykle bakterii, nie wykonując jednocze...
The use of Kinesiology Taping method in patients with rheumatoid hand – pilot study
Background.Rheumatoid arthritis (RA) most frequently affects smaller joints in the hands and feet. Among the most common deformations resulting from the progression of the disease are ulnar deviation, Boutonniere deform...
Zachowanie się stóp i kolan podczas chodu pod wpływem dodatkowych środków usprawniania dzieci z mózgowym porażeniem dziecięcym
Wstęp. Prawidłowy chód człowieka charakteryzują zmiany ustawień kątowych kolana i stopy powodujące, że chód jest sprawny i nie wymaga nadmiernego wydatku energetycznego. U dzieci z m.p.dz. wzajemne relacje stopa-kolano s...