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Title: Protesi Totale d’Anca nel cane: modelli a confronto
Other Titles: Total Hip Replacement in dogs: a comparison between models
Authors: Trinelli, Enrico
Issue Date: 15-Oct-2020
Publisher: Università di Parma. Dipartimento di scienze medico-veterinarie.
Document Type: Master thesis
Abstract: Total Hip Replacement (THR) is a surgical solution for chronic and degenerative hip diseases. There are two types of prosthesis: cemented and cementless prosthesis. Many and different materials are used to realize them. They can be classified into three large categories: metals, polymers and ceramic materials. Generally prosthesis are made up of a stem and a head, composed by metal such as titanium, cobalt-chromium or stainless steel. The head articulates with cup, placed into the acetabulum. The cup is composed by a shell and a liner. The shell is often realized with metals and the liner with polymers. Cemented prosthesis, such as CFX of BioMedtrix, need a cohesive, the PMMA. It is composed by a liquid and a powder part, mixed by the surgeon in the surgical room. The coeshive, that fills the spaces between the prosthesis and the periosteum, guarantees the stability of the implant. Cementless prosthesis, such as BFX of BioMedtrix, Helica of Innoplant and Zurich of Kyon need a primary stability in order to achive the secondary one through osteointegration. Press fit, screw-in or fixation to the medial cortex by screws guarantee primary stability. Adult animals suffering from chronic and degenerative joint diseases, such as hip dysplasia, are the ideal candidates for surgery. Patients must be in good health. Age and quality of the bone influence the choice of the prosthesis: biological prostheses are indicated in young subjects and / or with healthy bone tissue; cemented prostheses are indicated in elder animals and / or with scarcely regenerative bone tissue. All prosthesis guarantee excellent results in the short and medium term. The rate of perioperative complications is 20%. The most frequent complications are femoral fractures, aseptic and septic loosening and luxations. Some complications can be corrected during the surgery, such as fracture of the femur. Prosthesis’s loosening and luxations often need a new surgery. Once the complications are resolved, hip replacement has a success rate of over 90%.
Appears in Collections:Scienze medico-veterinarie

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