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ACL Reconstruction

Bone Patellar Bone

Positioning

  • Side support, TQ, knee flexed to 70°

Incisions

  • First incision over distal half of patella & inferior pole, around 3-4 cm long
  • Second incision just medial to tibial tubercle, to allow access to tubercle & to tibial tunnel

Harvesting graft

  • Expose patellar tendon & define its medial & lateral borders
  • Incise patellar tendon longitudinally to provide desired graft thickness (10mm in big man)
  • Measure 25mm bone plugs within patella & proximal tibia
  • Start off bone by using osteotome to make using the dowel cutter easier
  • Use dowel cutter to harvest plugs
  • Drill holes in mid point of plugs prior to removing them
  • Use osteotome to harvest plugs
  • Place 5 Ethibond sutures through drill holes & mark graft appropriately

Preparing knee

  • Normal arthroscopy portals
  • Exclude meniscal or other problems
  • Clean up medial wall of lateral femoral condyle – use combination of curette & arthroscope. Clean up ligamentum mucosum
  • Establish graft entry point: 2-3mm of posterior wall should remain, at 11 o’clock in right knee & 1 o’clock in left knee. Make hole with awl. Commercial instruments are available to assist with femoral tunnel placement
  • Get goldfinger & position with point just medial to lateral tibial spine. May need to clean up ACL stump a little but don’t get rid of all of it. Set angle to 45-55° & introduce other end via tibial incision. Drill wire through; should emerge into axilla of goldfinger. Note that another suggested tibial tunnel exit is just medial to the anterior horn of the lateral meniscus. Hale says should be posterior to intermeniscal ligament. JBJSB 2003 – Allum says the guide wire should emerge posterior to the posterior edge of the anterior horn of the lateral meniscus, 5-7mm anterior to the PCL & in the posterior half of the ACL stump if this is present. Formerly, graft placement in the anterior half of the footprint was advised
  • Drill out tunnel with drill 1mm bigger than graft. This makes graft placement much simpler
  • Drill wire into awl hole with the knee flexed
  • Drill out hole in femur, passing wire out the proximal femur
  • Clean out holes thoroughly with curettes & arthroscope

Graft Fixation

  • Run graft through tunnels. Secure in femur with RCI screw
  • Extend knee & see if graft impinges. If it does, will need to perform notch plasty
  • Then extend knee & fix graft in tibia

Postop

  • Allows full weight bearing
  • Important thing initially is to obtain full extension