Jun Ouchida, Hiroaki Nakashima, Tokumi Kanemura, Kotaro Satake, Kei Ando, Kenyu Ito, Mikito Tsushima, Masaaki Machino, Sadayuki Ito, Hidetoshi Yamaguchi, Naoki Segi, Hiroyuki Koshimizu, Hiroyuki Tomita, Shiro Imagama


July 2022, pp 1 - 9 Original Article Read Full Article 10.1007/s00586-022-07251-6

First Online: 01 July 2022

Purpose

To clarify the impact of restriction of hip extension on radiographic whole-body sagittal alignment with using postoperative changes of radiographical parameters for hip osteoarthritis.

Methods

We prospectively enrolled 68 patients with hip osteoarthritis scheduled for arthroplasty. Variables included manual examination of hip range of motion (H-ROM) and radiographic whole-body sagittal alignment parameters including sagittal vertical axis (SVA), center of acoustic meatus and femoral head offset (CAM-HA), thoracic kyphosis (TK), lumbar lordosis, sacral slope (SS), and knee flexion angle (KF). We divided patients with preoperative hip extension angle 

Results

Fifty-seven patients (The ER + group included 28 patients and the ER− group included 29 patients.) were available for the analysis. Pre-/postoperative H-ROM were 99.7 ± 24.9/118.1 ± 16.0 degrees (p 

Conclusion

Patients with restriction of hip extension showed global spine imbalance, and significant changes in TK, SS, and KF were observed after arthroplasty. The presence of hip joint disorder and H-ROM restriction must be considered when evaluating spinopelvic alignment and whole-body sagittal alignment.


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