Revision Total Ankle Replacement Journal of Bone and Joint Surgery Essential Surgical Techniques January 2016,vol 4 Mayerson and Aiyer et al Institute of Foot and Ankle Recons t Baltimore Presenter : Dr Saumya Agarwal Junior resident Dept of Orthopaedics J.N. Medical College and Dr. Prabhakar Kore Hospital and MRC, Belgaum
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Revision Total Ankle Replacement
Journal of Bone and Joint Surgery Essential Surgical Techniques January 2016,vol 4 Mayerson and Aiyer et al Institute of Foot and Ankle Reconst
Baltimore
Presenter : Dr Saumya Agarwal
Junior resident Dept of Orthopaedics J.N. Medical College and Dr. Prabhakar Kore Hospital and MRC, Belgaum
INTRODUCTION
• Failure rates of Total Ankle Replacement – 10% to 30% - over 10 yrs
• A recent meta-analysis – 317 TAR – failure rate of 12% @ 6 yrs
• Another meta-analysis - 852 patients – 24% had poor result
• proximal tibial cuts leads to joint line elevation
• Insert 3.5mm guide pin into proximal tibial tubercle
• Attach tibial alignment guide
• Attach cutting guide to tibial alignment jig
• Cut should be perpendicular to mechanical axis
• Drill the proximal 2 holes on either side of tibial cutting jig
• Place pins in proximal 2 holes to protect malleoli from excursion of saw blade
• Make the tibial cut and remove the cutting guide
Make Talar Bone Cut
• Attach the talar cutting block to tibial alignment guide
Limited amount of bone should be resected from talus
Slide cutting block until it is flush with talar surface
• Place pins to lock talar cutting block into desired position
• Place a saw through distal slot of guide to perform talar cut
• Freehand technique to make the talar cut
• Place a lamina spreader into wound to distract the joint
• This aids with fluoroscopic visualization of joint to ensure that bone cuts and joint preparation are adequate
• Evaluate status of osseous surfaces to ascertain whether grafting or cementing is necessary to support the revision components
Managing Loosening & Cavitary Defects
If there is substantial bone loss around tibia after component removal, consider impaction bone grafting, as better bone quality makes it easier to obtain a press fit and allow immediate weight bearing.
Place Trial Components
• Insert tibial and talar trials and appropriately sized polyethlene at the same time
• Lock the talar trial with pins placed medially and laterally on anterior edge
• Check the fluoroscopic position of trial components and check complete range of motion to ascertain stability
• Drill holes for tibial component keel and then remove tibial trial
• Drill holes for talar component keel and then remove talar trial
• Thoroughly irrigate the wound
Cementing Technique
• In revision settings, manual cement insertion is important because there is no medullary canal to work around
Results
• 41 patients
• Mean time b/w TAR & revision TAR – 51 months
• Talar subsidence – most common (63%)
• Subtalar arthrodesis – 54%
• Arc of motion improved 5°, i.e., to 23° post-op
• 41 34 retained TAR 5 revision arthrodesis 2 amputation
Mean follow up time - 49 months
• AOFAS score 65 points
• VAS 4.4 points
• Revised foot function index score – 68% excellent results
• 73% return to their prior job
• only 44% able to return to previous activity level
Pitfalls & Challenges
• Many patients with previous TAR, have implants from syndesmotic arthrodesis or in the medial malleolus
• These screws should be left in place, to prevent #
• Implants that cross tibia should be removed to facilitate correct placement of tibial component
Take Home Message
Revision Total Ankle Replacement is better than Arthrodesis in failed Primary Total Ankle Replacement