For years, spine surgeons have lumped all proximal junctional kyphosis (PJK) and proximal junctional failure (PJF) together under one umbrella diagnosis — convenient, yes, but increasingly misleading.
This study pulls back the curtain and reveals what many spine surgeons have long suspected: PJK is not one entity — it’s a collection of distinct failure mechanisms, each with its own timeline, radiographic personality, and clinical consequences.
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