Biomechanics and Motion Analysis

Wire Fixation Technique for Tibial Tubercle Osteotomy. Mechanical Comparison of 3 Wires vs 2 Wires

Principal Investigator: Kenton R. Kaufman, Ph.D.

In the difficult primary total knee arthroplasty and revision surgery, exposure with standard techniques can be problematic, especially in the stiff knee. Transection of the quadriceps tendon above the patella can aid exposure , but can also compromise quadriceps function. Tibial tubercle osteotomy has many advantages and results in excellent exposure. Using this technique, the risk of patellar tendon avulsion should be minimized.

Optimal fixation of the osteotomized fragments remains controversial. There are studies showing that two screws provide the strongest fixation. But when using an intramedullary stem the placement around it may be difficult and potentially weaken the bone. Many surgeons use cerclage wires for fixation of the tibial tubercle osteotomy. This study will compare the static fixation strength of 3 vs. 2 cerclage wires to stabilize tubercle osteotomy.