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Classifying radiographic changes of the pubic symphysis in male athletes: development and reproducibility of a new scoring protocol

journal contribution
posted on 2021-01-11, 00:54 authored by A Serner, J Arnaiz, Andrea MoslerAndrea Mosler, E Almusa, Z Vuckovic, I Tak, M Maas, A Weir, P Hölmich
© 2020 The Authors Purpose: To develop a specified radiographic scoring system for the pubic symphysis and adjacent bones, and to examine the intra- and inter-rater reproducibility of this system. Method: Development of the scoring protocol was performed in three stages using AP pelvis radiographs of 102 male adult athletes. The final protocol included 5 overall scoring items, which included further specification of locations: 1) bone lucency (erosion-like configuration and cysts), 2) proliferation, 3) fragmentation, 4) sclerosis, and 5) joint space width. Intra- and inter-rater reproducibility were determined using Cohen's kappa statistic (κ) and intraclass correlation coefficient (ICC). The standard error of measurement (SEM) and minimal detectable difference (MDD) were also determined. Results: We present a radiographic scoring protocol with clear definitions and examples to improve clinical usability. Intra-rater reproducibility was: bone lucency (erosion-like configuration or cysts): κ = 0.67 (95 %CI 0.56−0.78), proliferation: κ = 0.54 (95 %CI 0.38−0.70), fragmentation: κ = 0.80 (95 %CI 0.67−0.93), sclerosis: κ = 0.60 (95 %CI 0.49−0.71), and joint space width: ICC(2.1) 0.85 (95 %CI 0.78−0.89), SEM 0.4 mm, MDD 1.2 mm. Inter-rater reproducibility was: bone lucency: κ = 0.61 (95 %CI 0.50−0.72), proliferation: κ = 0.34 (95 %CI 0.20−0.48), fragmentation: κ = 0.67 (95 %CI 0.50−0.84), sclerosis: κ = 0.30 (95 %CI 0.17−0.43), and joint space width: ICC(2.1) 0.72 (95 %CI 0.59−0.81), SEM 0.5 mm., MDD 1.5 mm. Conclusions: The Aspetar pubic symphysis radiographic scoring protocol contains five overall scoring items, with additional specifications. These five items showed moderate to almost perfect intra-rater reproducibility, and fair to substantial inter-rater reproducibility. This protocol provides the basis for use in clinical practice, and will allow future investigations of the clinical significance of radiographic changes at the pubic symphysis in athletes.


Publication Date



European Journal of Radiology



Article Number



7p. (p. 1-7)





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