Objective To observe the micro defect of rabbit femoral head with phase-contrast imaging with synchrotron X-ray.Methods Bilateral femoral heads of rabbits were taken,micro defect was made on one side by specially made knife,the other was intact so as to be the control.Phase-contrast imaging with synchrotron X-ray was applied to observe the cartilage.Results About 50 μm defect of rabbit femoral head cartilage could be revealed clearly by phase-contrast imaging with synchrotron X-ray.Conclusion Phase-cont...