Animal model of femoral medullary cavity block with bone cement for imitating artificial joint of bone cement

Hongyu LI; Hong AN; Bin LIANG; Rongzhu LI; Wen TIAN; Minke WEI

ABSTRACT

BACKGROUND:

There are so many researches on complication of artificial joint of bone cement in clinics, but the effect of implanting artificial joint of bone cement on distal femoral shaft is unclear.

OBJECTIVE:

To provide an ideal animal model for study the effect on distal femoral shaft after implanting the artificial joint of bone cement.

DESIGN:

Controlled observation.

SETTING:

People's Hospital in Guangzi Zhuang Autonomous Region.MATERIALS A total of 16 healthy adult New Zealand rabbits, of clean grade, of both genders, weighing 2.6-3.5 kg, were selected in this study.

METHODS:

The experiment was completed in the Experimental Animal Centerof Chongqing Medical University from July 2002 to April 2003. According to the third rotator, neck of femur of rabbits was not broken off;meanwhile, lateral part of greater trochanter was sawed up above the third rotator, entrance of medullary cavity of bone was found among fossas of rotator, and bone cement was perfused into left femoral medullary cavity by blocking of proximal and middle femoral medullary cavity with polymethyl methacrylate (PMMA) to establish the rabbit model. Right side of rabbits was regarded as the control. Rabbits were sacrificed under drugged state after modeling establishment.MAIN OUTCOME

MEASURES:

Results of gross femur and X-ray image of rabbits.

RESULTS:

A total of 16 rabbits entered the final analysis. ① Gross dissection showed that the femoral medullary cavities of rabbits were well filled with PMMA and completely blocked above their middle segments. It suggested that the method for setting up animal model achieved the purpose of blocking the proximal and middle femoral medullary cavity. ② X-ray image further confirmed that the femoral medullary cavities of rabbits were well filled with PMMA and completely blocked above their middle segments.

CONCLUSION:

The rabbit model was successfully established by blocking the proximal and middle femoral medullary cavity for imitating the fixed artificial joint of bone cement.