First investigation: production process analysis: a review of the dhr demonstrated that the mid-c system was manufactured, tested, and released according to specification.User (surgeon and patient) information analysis: the initial surgery and the follow up x-ray demonstrate on curve progression, the curve progression was due to extender misalignment which was indicated on the post initial x-ray , the angle between the extender and the mid-c rod should be by design between 5-15° ,the x-ray demonstrate that the angle was less than 5°, also the extender that was choose is lenke 5 instead of lenke 1.
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