When Polyethylene Exchange Is Appropriate for Prosthetic Kne .. : JAAOS Global Research & Reviews

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When Polyethylene Exchange Is Appropriate for Prosthetic Knee Instability

The X3 is designed to retain mechanical properties while reducing the proportion of free radicals. A knee simulator study comparing six poly designs demonstrated the lowest wear rates https://www.tokenexus.com/ with X3 poly [16]. However, early failures with fractures and oxidation damage have been reported with this design affecting mainly the posteromedial and lateral borders [17].

• An ideal PE’s properties include strong resistance to wear, oxidation, and FCP and should retain these properties in-vivo for the long-term.
• Additionally, this option could be used in coronal instability with incompetent ligaments; however, this would require a varus-valgus constrained poly and a compatible femoral implant in place.
• Of the three patients with a type 2 instability pattern (flexion-extension mismatch), one was re-revised; the remaining two patients still felt unstable and one of those was not satisfied with their pain improvement.
• Only approximately 50% of patients became stable and had adequate pain relief via PE only for prosthetic knee instability.
• This retrospective chart review classifies and reports on a series of patients where PE only was used to manage an unstable TKA.
• Considerations include patient co-morbidities, onset of infectious symptoms since the index procedure, duration of symptoms and the infecting organism.
• The femoral component must be correctly rotated using the tibial platform as a main guide to recreate a symmetric flexion gap with collateral ligament equally tensioned.

When Polyethylene Exchange Is Appropriate for Prosthetic Knee Instability : JAAOS Global Research & Reviews

Aspiration with joint flexion in the ‘drop-and-dangle’ position puncturing through the patellar tendon using a spinal needle and pointing into the intercondylar notch of the implant may be a helpful trick for dry and scarred joints. Routine radiographic evaluation is based on standing how to buy polymath anteroposterior (AP) and lateral X-rays to assess implant fixation status, position and size. From 1987 to 1996, 47 revision total knee arthroplasties were done for tibiofemoral instability. Sixteen of these patients had polyethylene exchange only to treat their instability.

• A type 3 instability pattern is global in nature; that is, ligamentous instability is present both in full extension and at 90° of flexion.
• Although there are no long term data using X3 in TKA, the short term studies have demonstrated superior wear characteristics [18,19].
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• Patients and surgeons alike should understand that this low morbidity option does not guarantee a good result regardless of whether it is used for an appropriate indication.

Polyethylene Exchange Only for Prosthetic Knee Instability

Planning an rTKA requires a complete bilateral knee joint X-ray series which includes a standing AP view tangential to the tibial platform, a lateral view tangential to the femoral condyles, a full limb AP standing view, and an axial 45° Merchant patellar view. Open arthrolysis had been reported with sub-optimal success in gaining arc of motion. This was followed by an intensive rehabilitation protocol, and 16 of the 17 patients improved clinically.

Alkaline stability of pendant C2-protected poly(imidazolium)s

Open Debridement and Polyethylene Exchange (ODPE) in the Infected Total Knee Arthroplasty