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22 Cards in this Set
- Front
- Back
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The goal is to make the distal femoral cut perpendicular to what?
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Mechanical axis of femur
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How much should the distal femoral cut angle measure?
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6 degrees valgus
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How should the external rotation angle for the femoral component measure?
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3 degrees external rotation
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What three landmarks can be used to assess femoral component rotation?
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Whiteside's line
Epicondylar axis Posterior condylar axis (3 to 5 degrees shy of neutral) |
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has notching been shown to affect TKA outcomes?
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Notching has not been demonstrated to have a significant effect on outcomes
May have some association with periprosthetic fracture risk |
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The goal is to make the tibial cut perpendicular to what?
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Tibial mechanical axis
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When should an IM rod not be used for a tibial cut?
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If the tibial mechanical axis is not the same as the anatomic axis
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Defects up to 1 cm can be filled with what? What about the larger defects?
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<or equal to 1 cm: cement
> 1cm: metal augments |
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What is the minimum acceptable tibial ultra high molecular weight polyethylene thickness?
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8 mm
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How can the patellar cut compromise patellar tracking?
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Excessive lateral facet cut can lead to subluxation
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Is a deeper trochlea better for tracking?
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Yes
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What is the minimum acceptable patellar thickness after cut?
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12 mm
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With a varus deformity, what two structures should be released first?
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Osteophytes
Deep MCL |
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If the knee is still not balanced, what two structures should be released next?
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Posteromedial corner
Semimembranosus |
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If all else fails, what structure can finally be released?
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Superficial MCL
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What happens if the MCL is inadvertently over-released?
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Constrained total knee required
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With a valgus deformity, what two structures should be released first?
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Osteophytes
Lateral capsule |
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What are the next steps if the knee remains tight in extension? What if it remains tight in flexion?
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Extension tight: release IT band
Flexion tight: release popliteal tendon |
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If the valgus deformity is severe, release of which structure may provide additional improvement? Then what is needed?
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Release LCL
Then need constrained prosthesis |
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What is the potential complication of over correcting valgus knees?
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Peroneal nerve stretch
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Peroneal palsy most often occurs with what two preoperative features?
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Valgus knee
Flexion contracture |
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What is the ideal position in which to close the knee?
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Closing in flexion achieves equivalent ROM as with postoperative continuous passive motion (CPM) device use
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