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Author Spotlight: A Novel 3D-Printed Titanium Implant for Minimally Invasive Treatment of Hip Dysplasia in Young Dogs
Published on: April 19, 2024
[Change in rheumatic hip surgery]
1Universitätsklinik für Orthopädie und Unfallchirurgie, Abteilung für Orthopädie, Medizinische Universität Wien, Währinger Gürtel 18-20, 1090, Wien, Österreich. johannes.holinka@meduniwien.ac.at.
Abstract:
There is a trend towards a reduction in joint-preserving hip surgery, such as synovectomy and total hip joint replacement in rheumatic patients. This is mostly due to the success of biological disease-modifying antirheumatic drugs (bDMARD) in systemic anti-rheumatic therapy. The results of hip surgery in rheumatic patients are comparable to those in non-rheumatic patients, except for prosthetic joint infections, which are higher in patients with rheumatoid arthritis. Especially in hip surgery there was a big evolution in the last few years including a broad range of minimally invasive surgical methods, such as hip arthroscopy, mini-open hip surgery and minimally invasive hip arthroplasty with bone preservation or short femoral shafts. These surgical methods also have an advantage in the treatment of typical rheumatoid pathologies and have the benefit of a rapid recovery.
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Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
The work done by the gas on the piston can be expressed as
Le Chatelier's Principle: Changing Temperature
To understand this phenomenon, consider the elementary reaction:

