The Paraspinal Sarcopenia at the Upper Instrumented Vertebra Is a Predictor of Discoligamentous but Not Bony Proximal Junctional Kyphosis.

93d); however, the difference did not reach statistical significance.

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On univariable Cox proportional hazard analysis ( Table 2 ), time to PJK was found to be positively predicted only by total paraspinal CSA at the UIV (HR 0.74 per 100 mm 2 ; 95% CI [0.57, 0.96]; p = 0.02) though global tilt (HR 1.03 per °; [1.00, 1.05]; p = 0.09) and total paraspinal muscle CSA at the mid-L3 level (HR 0.94 per 100 mm 2 ; [0.89, 1.01]; p = 0.07) both approached significance.

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