J Korean Knee Soc.  2007 Dec;19(2):199-203.

The Effect of Patellofemoral Overstuffing in Total Knee Arthroplasty

• Lee A
• Choi CH
• Kim KC

Abstract

PURPOSE: We aimed to evaluate effect on maximum knee flexion by patellofemoral overstuffing after total knee arth- roplasty
MATERIALS AND METHODS
As a prospective inspection we have measured anterior hump height of distal femur in the preoperative true lateral radiographic view in those who had taken total knee arthroplasty with Genesis II which is external rotation laden prosthesis allowing to be inserted parallel to femoral anterior cortex. We compared the thickness of anterior hump height resected during operation and thickness of anterior flange of femoral prosthesis and then considered post operative thickness of patella to estimate the effect of patellofemoral overstuffing in 55 cases comparing maximum knee flexion.
RESULTS
The average thickness of resected femoral anterior hump was 7.14+/-1.91mm. Average in hump overstuffing was 1.32+/-1.09mm and postoperative maximum flexion angle was average of 125.6+/-15.5 degree with average decrease of 1.8 degree. In 29 cases, Average of 1.35mm of overstuffing occurred in patella overstuffing and postoperative maximum flexion angle was average of 131.0+/-16.4 degree with average increase of 2.1 degree. Considering change of anterior femoral hump height and thickness of patella, preoperative and postoperative average maximum flexion angle was 128.9+/-14.9, 128.0+/-14.5 degree, repectively in patellofemoral overstuffing with average decrease of 0.9 degree.
CONCLUSION
We concluded that the patellofemoral overstuffing does affect the decrease of the angle of maximum flexion in total knee arthroplasty and the effect of hump overstuffing is superior than patellar overstuffing effect.

Keyword

Anterior hump height; Patellofemoral overstuffing; Total knee arthroplasty

MeSH Terms

Arthroplasty*
Femur
Knee*
Patella
Prospective Studies
Prostheses and Implants