Abstract: Objective　To evaluate the biomechanical properties of the micro memory compression alloy plate (GYZ memory alloy plate) after anterior cervical discectomy and fusion, so as to provide basis for clinical application, postoperative care, and follow-up experimental research and improvement of the implant. Methods　Three dimensional finite element models of C5, C6 cervical vertebrae and miniature memory compression alloy plate were established in a healthy adult female volunteer. The stress distribution of the stress concentration area on the endophyte under different working conditions was compared and analyzed. Results    In the neutral position, the stress distribution on the plant was relatively uniform and the stress value was small. In the forward bending state, the average stress of each area was the largest relative to the other working conditions, and the maximum average stress was located in region 6, namely the lower hook part, which was (45.89±5.32) MPa. In the extension state, the stress distribution of regions 1, 2, 3 and 4, that is, the pressurized parts, was more uniform (P>0.05). Under lateral flexion condition, the stress distribution of the implant was uneven, and the average stress of the flexion side was much higher than that of the extension side (P<0.05). Under the rotating condition, the stress was concentrated in the upper part of the opposite side and the lower part of the same side. Under the condition of left rotation, they were (23.66±6.24) MPa and (23.62±7.07) MPa. Under the condition of right rotation, they were (24.16±5.42) MPa and (24.58±5.30) MPa. Except for the neutral position, under the other six working conditions, the upper and lower hooks placed inside the vertebral body were subject to greater stress.　Conclusions　After the micro memory compression alloy plate is implanted in the front of the neck, it is necessary to reduce forward bending, avoid too frequent or too intense lateral bending and rotating movements, and it is safest to maintain a neutral position. In the follow-up research and improvement process, it can be considered to strengthen the fixing strength of the upper and lower hooks of the inner plant.

Key words: Anterior cervical plate; ,  , Memory alloy plate; ,  , Finite element analysis; ,  , Biomechanics