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Loose extension and flexion gaps
1%
35/4567
Loose extension gap
3%
121/4567
Loose flexion gap
95%
4342/4567
Tight flexion gap
32/4567
Tight extension gap
0%
14/4567
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Illustration A shows the flexion and extension gaps that occur during TKA. Cutting too much posterior femur will lead to a gap mismatch, with a larger flexion gap than extension gap. This creates laxity in knee flexion. If the distal femur is cut too aggressively, extension gap instability would occur. Over-resection of the proximal tibia leads to a balanced gap issue, with need for increased tibial polyethylene thickness to replace the resected bone. The referenced study by Clarke and Scuderi is a review article of flexion instability in total knee arthroplasty; this article covers diagnosis and treatments of scenarios such as seen in this question.
3.8
(23)
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