事实上，枕骨可供固定的区域有限，如果进行枕骨下颅骨切除术，则会进一步受限，这对现有的固定技术构成挑战。
In fact, the area available for the implant fixation is limited and can be restricted further when a suboccipital craniectomy has been performed, posing a challenge to current fixation techniques.
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