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Article

Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia

  • Authors:
    • Liangguo Fa
    • Qing Wang
    • Xiangxing Ma
  • View Affiliations / Copyright

    Affiliations: Department of Medical Radiology, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China, Department of Medical Radiology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
  • Pages: 1934-1938
    |
    Published online on: October 8, 2014
       https://doi.org/10.3892/etm.2014.2009
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Abstract

The aim of this study was to evaluate the limitations of the Tönnis angle as one of the most commonly used parameters in the diagnosis of acetabular dysplasia, and to explore the feasibility of the modified Tönnis angle in the diagnosis of acetabular dysplasia. A total of 224 patients (120 females and 104 males) with 448 hips, aged between 15 and 83 years (median, 45.0 years), were selected for the measurement of the center‑edge (CE) and Tönnis angles. To evaluate the relative position of the medial edge of the acetabular sourcil, a new parameter, known as the center‑medial‑edge (CME) angle, was designed. As an improvement of the Tönnis angle, a new angle preliminarily termed the modified Tönnis angle was created. In addition, the degree of clarity of the medial edge of the acetabular sourcil on radiograph was evaluated, and the hips were divided into the clear‑edge and blurred‑edge groups. The hips belonging to the blurred‑edge group could not be used for Tönnis angle measurements. All measurements were performed digitally using the tool of the picture‑archiving communication system. Among the 448 acetabular sourcils, 142 had a blurred medial edge (31.7%). The mean value of the CME angle was 37.94˚, with a range of 21.76‑63.99˚. The 95% prediction interval of the modified Tönnis angle was estimated to be -6.39 to 11.73˚. The correlation coefficients were -0.838 between the CE and Tönnis angles, 0.889 between the Tönnis and modified Tönnis angles and -0.905 between the CE and modified Tönnis angles. In conclusion, the modified Tönnis angle can substitute for the Tönnis angle without joint space narrowing and subluxation of the hip, particularly when the Tönnis angle cannot be measured due to a blurred medial edge of the acetabular sourcil on pelvic radiograph.
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Copy and paste a formatted citation
Spandidos Publications style
Fa L, Wang Q and Ma X: Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia. Exp Ther Med 8: 1934-1938, 2014.
APA
Fa, L., Wang, Q., & Ma, X. (2014). Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia. Experimental and Therapeutic Medicine, 8, 1934-1938. https://doi.org/10.3892/etm.2014.2009
MLA
Fa, L., Wang, Q., Ma, X."Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia". Experimental and Therapeutic Medicine 8.6 (2014): 1934-1938.
Chicago
Fa, L., Wang, Q., Ma, X."Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia". Experimental and Therapeutic Medicine 8, no. 6 (2014): 1934-1938. https://doi.org/10.3892/etm.2014.2009
Copy and paste a formatted citation
x
Spandidos Publications style
Fa L, Wang Q and Ma X: Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia. Exp Ther Med 8: 1934-1938, 2014.
APA
Fa, L., Wang, Q., & Ma, X. (2014). Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia. Experimental and Therapeutic Medicine, 8, 1934-1938. https://doi.org/10.3892/etm.2014.2009
MLA
Fa, L., Wang, Q., Ma, X."Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia". Experimental and Therapeutic Medicine 8.6 (2014): 1934-1938.
Chicago
Fa, L., Wang, Q., Ma, X."Superiority of the modified Tönnis angle over the Tönnis angle in the radiographic diagnosis of acetabular dysplasia". Experimental and Therapeutic Medicine 8, no. 6 (2014): 1934-1938. https://doi.org/10.3892/etm.2014.2009
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