Spinopelvic-Hip Harmony [PFA-(PI-LL)] as a Radiographic Indicator of Hip Extension Compensatory Reserve in Kyphotic Adult Spinal Deformity: A Multicenter Study.

Keisuke Ishikawa¹, Kohei Takahashi¹, Ko Hashimoto¹, Kenichiro Yahata¹, Kazuyoshi Baba¹, Takahiro Onoki¹, Ryo Fujita¹, Junya Kusakabe¹, Tomonori Kawaharada¹, Michiyoshi Sato², Takeshi Nakamura³, Ryo Sugawara⁴, Kyoichi Handa⁵, Haruo Kanno⁵, Hiroshi Ozawa⁴, Yasuhisa Tanaka³, Toshimi Aizawa¹

¹Department of Orthopaedic Surgery, Graduate School of Medicine, Tohoku University, Sendai, Japan.

²Department of Orthopaedic Surgery, Ishinomaki Loyal Hospital, Ishinomaki, Japan.

³Department of Orthopaedic Surgery, Tohoku Central Hospital, Yamagata, Japan.

⁴Department of Orthopaedic Surgery, JCHO Sendai Hospital, Sendai, Japan.

⁵Department of Orthopaedic Surgery, School of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan.

PubMed PMC DOI PDF

Abstract

Study DesignRetrospective multicenter observational study.ObjectivesIn kyphotic adult spinal deformity (ASD), hip extension, assessed by pelvic femoral angle (PFA), compensates for sagittal malalignment, but no radiographic measure quantifies residual "hip extension reserve." When hip compensation fails, knee flexion, assessed by femoral inclination (FI), is recruited and forward trunk inclination…

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