Relaxation, creeping and unidirectional tensile tests were made in living rabbit cervical vertebra C 3 -C 5 . Relevant biomechanical tests were also made in rabbit after C 4 lamina resection with and without MMA/S and MMA repair. Based on in-vivo tests using 3-components model, relaxation and creeping modules [Y(t),J(t)] were calculated and differential and integral constitutional equations obtained. The results showed that after lamina resection, the stability of cervical vertebra of rabbit was disturbed and the stability recovered after lamina repair, thus suggesing the necessity and feasibility of lamina repair.