Inflammatory Arthritis Clinical Trial
Official title:
Defining in Vivo Kinematics of Single Piece Silastic Joint Replacements in the Hand With Magnetic Resonance Imaging
To assess in vivo the kinematics of single piece silastic joint replacements in the hand with magnetic resonance imaging
Proximal inter phalangeal joint (PIPJ) replacement is performed for pain relief in the end stage of arthritis. Rheumatoid arthritis is the commonest indication in the metacarpophalangeal joint (MCPJ). In the PIPJ there is a more even spilt between degenerative and rheumatoid arthritis. There are several options for PIPJ replacement currently licensed for use in the United Kingdom although data is not entered in to the National Joint Registry so the exact numbers and failure rates are unknown. Data from the Norwegian joint registry indicates that 99% of implanted MCPJ and PIPJ replacements are single piece silastic implants. Three main prostheses represent the majority of implants used in the United Kingdom, Swanson, Sutter and Neuflex. All these implants have been shown in the literature to fracture either at the hinge or the distal stem - hinge interface. This is true of explants and in vitro simulator testing. Long term survivorship in MCPJ and PIPJ replacement is below that of hip and knee replacement. One of the largest single series shows 63% survivorship at 17 year follow up but with radiological evidence of failure in at least two thirds. This compares poorly to the 82.9% survivorship for Exeter cemented hip replacements at 22 years. The long term aim of this project is to understand how the implants move. This will help explain failure in particular the newly observe hinge failure in Neuflex implants and provide ideas to improve these implants. Any modifications can be tested on the in vitro finger joint testing rig The method of MRI acquisition will be similar to that described in. This will require optimising. In order to limit movement to a sagittal displacement, a thermoplastic splint will support the wrist and hand up to the level of the proximal palmer crease. A rig will also be made to hold the MCP / PIP joints in extension and positions of flexion increasing by 200 to maximum flexion. These will depend upon the patient's range of motion. The Investigators will define the centre of rotation of the hinge then points on the shoulder and stem of the implant from which to measure displacement. Points on the metacarpal and proximal phalanx will also be defined to allow measurement of the displacement of the implant relative to the bone during the range of movement. ;
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