The most common complication of TKA is abnormal patellar tracking. A normal Q angle is the most important variable in proper patella tracking. It is critical to avoid surgical techniques that lead to an increase in the Q angle.
Common Surgical errors include:
- Internal rotation of the femoral component.
- Medialization of the femoral component.
- Internal rotation or medialization of the tibial prothesis.
- Placing the patella prosthesis lateral on the patella.
- Placing the patella prosthesis to low on the patella.
- Cutting the patella bone to much or too little.
- Not doing a lateral release when indicated.
- Using the wrong design of prosthetic patella implant.
- Choosing a femoral component with an unfriendly sulcus.
- Using a femoral component with a too wide intercondylar box.