TKA – Inflammatory

Modern Study Review (AI-Generated)

High-Yield Summary

Total knee arthroplasty (TKA) in patients with inflammatory arthritis, such as rheumatoid arthritis (RA), presents unique challenges due to altered bone quality, soft tissue contractures, and complex deformities. Successful outcomes hinge on meticulous soft tissue balancing and appropriate implant selection to address ligamentous instability and multiplanar deformities. Modern approaches emphasize individualized surgical planning, often requiring constrained prostheses and advanced balancing techniques to optimize pain relief and function.

Key Diagnostic Findings

Current Gold Standard Treatment

• Non-Operative Indications:
• Mild symptoms with preserved function.
• Optimization of medical management of systemic disease (DMARDs, biologics).
• Physical therapy to maintain range of motion and strength.

• Operative Indications:
• Severe pain refractory to medical therapy.
• Significant deformity or instability impairing function.
• Radiographic joint destruction with loss of cartilage and bone.

• Surgical Considerations:
• Extensive soft tissue releases for contractures and deformities.
• Ligament balancing critical; anticipate flexion-extension gap mismatch.
• Use of constrained or semi-constrained implants when collateral ligaments are insufficient.
• Strategies to manage flexion gap > extension gap include PCL release, distal femoral resection adjustment, and posterior condylar augments.
• Preservation or restoration of joint line height is essential for function.

Modern Complications & Outcomes

– Outcomes:

• Generally good pain relief and improved function.
• Lower activity demands in RA patients contribute to implant longevity.
• Close monitoring for complications and multidisciplinary care optimize results.

Classic Clinical Notes

TKR-inflamm.

Approach to Inflammatory Arthritis – Knee Arthritis

• Successful arthroplasty in rheumatoid knees is largely attributable to their low demand and limited rehab goals.
• Be aware that bone turnover may be higher in peri-articular bone and may compromise fixation.
• All inflammatory arthropathies may have significant ligament and soft-tissue contractures and concomitant multiplanar deformity—be prepared to do significant soft tissue releases, ligament balancing, and be ready for the possibility that there will be residual instability requiring more constrained prosthesis.
• Extensive ligament release may make for an overly large flexion gap where the collaterals are most slack—in extension, the collaterals tighten and stability is more readily achieved.

Strategies to deal with the flexion/extension mismatch – with normal extension gap, but large flexion gap:

• Release the PCL—although this might make it worse in that releasing the PCL tends to increase the flexion gap more than the extension gap. Nonetheless, it is probably easier to balance the knee with this gone.
• You can cut more off the distal femur and insert a bigger poly space—be aware that this elevates the joint line though!
• You can upsize the component and add posterior condyle augments to close down the flexion space—this will not change the joint line, but may require you to adjust all your components.

Last Updated on January 24, 2026 by orthonet