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allomorphism , paramorphism
S2 iliosacral screws can be safely and accurately accomplished using a standard technique in patients with unstable posterior pelvic ring disruptions and sacral dysmorphism.
对不稳定骨盆后环损伤及骶骨变异者，采用标准技术可以准确安全地置入s2骶髂螺钉。
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