RESUMO
Objective To study the short-term variation patterns of graft viscosity after anterior cruciate ligament reconstruction (ACLR) surgery. Methods Six male New Zealand rabbits were selected. The ACLR animal model of unilateral knee was made with Achilles tendon as the graft. The experimental rabbits were euthanized 15 days after ACLR surgery, with removal of the graft, healthy anterior cruciate ligament (ACL) and Achilles tendon. The cross-sectional area and viscosity coefficient of the graft were measured, and the creep experiments were carried out under equilibrium conditions of 0.1 MPa and 1 MPa, respectively. The viscosity coefficent was calculated. Variation patterns of graft viscosity were summarize. The grafts were compared with healthy ACL. Results The cross-sectional area of the graft increased slowly within 15 days after ACLR surgery. The viscosity of ACL and graft changed nonlinearly. The viscosity coefficient was quite different under different stresses. The viscosity coefficient of the graft decreased with the time after ACLR surgery, which was more obviously under the condition of low stress. Conclusions The results are helpful to guide the implementation of early postoperative rehabilitation plan after ACLR surgery .
RESUMO
According the current National standard for laboratory animal, herpes B virus antibody must be tested and negative for all the breed/tested macaques,howere,in fact the positive rate is around 60-70% in breeding colony. Being the National Standard, if it is too far from the reality of the filed, weighing and changing should be made.Hardness/crispness degree of laboratory animal diet never been considered as a listed value in the National Standard for Laboratory Animal to identify the quality of diet.In fact, this index affects a lot about daily diet intake and physiological status of laboratory animals.Hereby, the authors suggest to take the index into the National Standard, to assess the quality of laboratory animal diet in a more comprehensive way.