Stratifying outcome based on the Oswestry Disability Index for operative treatment of adult spinal deformity on patients 60 years of age or older: a multicenter, multi-continental study on Prospective Evaluation of Elderly Deformity Surgery (PEEDS)

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Nielsen, C.J.

Lewis, Stephen J.

Oitment, Colby

Martin, Allan R.

Lenke, Lawrence G.

Qiu, Yong

Kleuver, M. Marinus

Spruit, M. Maarten

Dahl, Benny

Berven, Sigurd H.