Can Hip-Knee Line Angle Distinguish the Size of Pelvic Incidence?—Development of Quick Noninvasive Assessment Tool for Pelvic Incidence Classification

Shota Yamada, Takeshi Ebara, Toru Uehara, Taro Matsuki, Shingo Kimura, Yuya Satsukawa, Akira Yoshihara, Kazuji Aoki, Atsushi Inada and Michihiro Kamijima
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Shota Yamada: Department of Occupational and Environmental Health, Graduate School of Medical Sciences, Nagoya City University, Nagoya 4678601, Japan
Takeshi Ebara: Department of Occupational and Environmental Health, Graduate School of Medical Sciences, Nagoya City University, Nagoya 4678601, Japan
Toru Uehara: Department of Rehabilitation, Nagoya City University West Medical Center, Nagoya 4628508, Japan
Taro Matsuki: Department of Occupational and Environmental Health, Graduate School of Medical Sciences, Nagoya City University, Nagoya 4678601, Japan
Shingo Kimura: Department of Rehabilitation, Nagoya City University West Medical Center, Nagoya 4628508, Japan
Yuya Satsukawa: Department of Rehabilitation, Nagoya City University West Medical Center, Nagoya 4628508, Japan
Akira Yoshihara: Department of Rehabilitation, Nagoya City University West Medical Center, Nagoya 4628508, Japan
Kazuji Aoki: Faculty of Rehabilitation Sciences, Nagoya Gakuin University, Nagoya 4568612, Japan
Atsushi Inada: Spine Center, Department of Orthopedic Surgery, Nagoya City University West Medical Center, Nagoya 4628508, Japan
Michihiro Kamijima: Department of Occupational and Environmental Health, Graduate School of Medical Sciences, Nagoya City University, Nagoya 4678601, Japan

IJERPH, 2022, vol. 19, issue 3, 1-14

Abstract: This study aimed to explore effective measurement angles for pelvic incidence (PI) classification and to develop a quick, noninvasive assessment tool for PI classification. We defined five variation types of hip–knee line (HKL) angles and tested the discrimination ability of the receiver operating characteristic (ROC) analysis using 125 photographs of upright standing posture from the right lateral side. ROC analysis revealed an applicable HKL angle defined by the line connecting the most raised part of the buttock and the central point of the knee and the midthigh line. The acceptable cut-off points for discriminating small or large PIs in terms of HKL angle were 18.5° for small PI (sensitivity, 0.91; specificity, 0.79) and 21.5° for large PI discrimination (sensitivity, 0.74; specificity, 0.72). In addition, we devised a quick noninvasive assessment tool for PI classification using the cut-offs of the HKL angle with a view to practical application. The results of intra- and inter-rater reliability ensured a substantial/moderate level of the tool (Cohen’s kappa coefficient, 0.79; Fleiss’s kappa coefficient, 0.50–0.54). These results revealed that the HKL angle can distinguish the size of the PI with a high/moderate discrimination ability. Furthermore, the tool indicated acceptable inter-/intra-rater reliability for practical applications.

Keywords: pelvic incidence; low back pain; hip–knee line; anthropometry; ROC curve; reliability (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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