Spine Alignment in Standing and Maximal Upper Limb Elevation in Baseball Players with Lumbar Spondylolysis and Those without Low Back Pain

Kanta Matsuzawa (), Tomoyuki Matsui, Yoshikazu Azuma, Tetsuya Miyazaki, Machiko Hiramoto, Ruo Hashimoto, Noriyuki Kida and Toru Morihara
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Kanta Matsuzawa: Marutamachi Rehabilitation Clinic, Kyoto 604-8405, Japan
Tomoyuki Matsui: Marutamachi Rehabilitation Clinic, Kyoto 604-8405, Japan
Yoshikazu Azuma: Marutamachi Rehabilitation Clinic, Kyoto 604-8405, Japan
Tetsuya Miyazaki: Marutamachi Rehabilitation Clinic, Kyoto 604-8405, Japan
Machiko Hiramoto: Marutamachi Rehabilitation Clinic, Kyoto 604-8405, Japan
Ruo Hashimoto: Marutamachi Rehabilitation Clinic, Kyoto 604-8405, Japan
Noriyuki Kida: Department of Biotechnology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-0951, Japan
Toru Morihara: Marutamachi Rehabilitation Clinic, Kyoto 604-8405, Japan

IJERPH, 2023, vol. 20, issue 4, 1-7

Abstract: The changes in lumbar lordosis angle (LL) and sacral slope angle (SS) related to upper limb elevation and thoracic kyphosis angle (TK) in baseball players with spondylolysis remain unclear. Herein, we investigated baseball players with spondylolysis and those without low back pain, comparing LL and SS with upper limb elevation within and between groups and TK between groups. Baseball players with spondylolysis were enrolled as subjects, and baseball players without low back pain were enrolled as controls (n = 8 each). X-rays were obtained in the standing position and with maximal elevation position of the upper limb (elevation position). LL and SS were measured in the standing and elevated positions, and TK was measured in the standing position. LL was significantly larger in individuals with spondylolysis than controls. The SS of the control group was significantly larger in the elevated position than in the standing position, while the SS of the spondylolysis group was not significantly different between positions. SS was significantly larger in the spondylolysis group than in the control group, only in the standing position. Physical therapy for spondylolysis should focus on hyperlordosis alignment in the standing and maximal elevation positions of both upper limbs, sacral hyper-slope alignment in the standing position, and decreased sacral slope motion.

Keywords: lumbar spondylolysis; lumbar lordosis angle; sacral slope angle; thoracic kyphosis angle; baseball (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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