Kinematics of Silastic Joint Replacements in the Hand

Defining in Vivo Kinematics of Single Piece Silastic Joint Replacements in the Hand With Magnetic Resonance Imaging


Lead Sponsor: Wrightington, Wigan and Leigh NHS Foundation Trust

Source Wrightington, Wigan and Leigh NHS Foundation Trust
Brief Summary

To assess in vivo the kinematics of single piece silastic joint replacements in the hand with magnetic resonance imaging

Detailed Description

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.

Overall Status Recruiting
Start Date 2022-04-07
Completion Date 2023-04-11
Primary Completion Date 2023-04-11
Study Type Observational
Primary Outcome
Measure Time Frame
Deformation Assesment - Assesment of deformation of single piece silastic joint replacements in vivo Six months
Secondary Outcome
Measure Time Frame
To compare the movement of different implant designs and single replacements with native joints in combination with the assesment of acceptability and feasibility of MRI. Through study completion, an average of one year
Enrollment 10

Intervention Type: Procedure

Intervention Name: Silastic Joint Replacement

Description: Participants who have had silastic joint replacement surgery for degenerative or inflammatory arthritis within the last three years


Sampling Method:

Non-Probability Sample


Inclusion Criteria: - Single piece silastic joint replacement with an adequate range of movement (ROM), i.e. an arc of movement of ≥ 50 - Age over 18 - Able to give informed consent Exclusion Criteria: - Any contraindication to MRI scanning - Fractured implant - Fixed flexion deformity >30 degrees in the replaced joint - Total range of motion <50 degrees in the replaced joint - Awaiting further surgery - Abnormal joint instability - Previous surgery on the same digit (other than the joint replacement) - Replacement of the joint of the opposite hand



Minimum Age:

18 Years

Maximum Age:


Healthy Volunteers:

Accepts Healthy Volunteers

Overall Contact

Last Name: Ian Trail

Phone: 01257 488229

Email: [email protected]

Facility: Status: Contact: Wrightington, Wigan & Leigh Teaching Hospitals NHS Foundation Trust Ian Trail 01257 567204 [email protected]
Location Countries

United Kingdom

Verification Date


Responsible Party

Type: Sponsor

Has Expanded Access No
Condition Browse
Patient Data No
Study Design Info

Observational Model: Other

Time Perspective: Retrospective

This information was retrieved directly from the website without any changes. If you have any requests to change, remove or update your study details, please contact [email protected]. As soon as a change is implemented on, this will be updated automatically on our website as well.

Clinical Trials on Degenerative Arthritis

Clinical Trials on Silastic Joint Replacement