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Three-dimensional kinetic simulation before and after rotational acetabular osteotomy

  • Original Article
  • Published:
Journal of Orthopaedic Science

Abstract

Background

Some reports indicate that one of major causes of clinical failure after periacetabular osteotomy is development of secondary femoroacetabular impingement (FAI). To assess the impact of range of motion (ROM) on the increase in FAI following rotational acetabular osteotomy (RAO), we performed FAI simulations before and after RAO.

Methods

We evaluated 12 hips that had undergone RAO (study group), and 12 normal hips (control group). The study group was evaluated before and after surgery. Morphological parameters were evaluated to assess acetabular coverage. The acetabular anteversion angle, anterior CE angle, alpha angle, and combined anteversion angle were also measured. Impingement simulations were performed using 3D-CT. The ROM which causes bone-to-bone impingement was evaluated in flexion (flex), abduction, external rotation at 0° flexion, and internal rotation at 90° flexion. The lesions caused by impingement were evaluated.

Results

Radiographic measurements indicated improved postoperative acetabular coverage in the study group. The crossover sign was recognized pre- and postoperatively in every case in the study group and in no cases in the control group. In the simulation study, flexion, abduction, and internal rotation at 90° flexion decreased postoperatively. Impingement occurred within 45° internal rotation at 90° flexion in two preoperative and nine postoperative cases. The impingement lesions were anterosuperior of the acetabulum in all cases. There were correlations between anterior CE angle, CE angle, acetabular anteversion angle, and hip flexion angle. There were also correlations between the anterior CE angle, combined anteversion angle, and angle of internal rotation at 90° flexion.

Conclusions

In the postoperative simulation, there was a tendency to reduce the ROM in flexion, abduction, and internal rotation at 90° flexion due to impingement. Since there were more cases which caused impingement within 45° internal rotation at 90° flexion after RAO, we consider there is a potential for increased FAI after RAO.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Science, 13-1 Takara-machi, Kanazawa, 920-8641, Japan

    Shintaro Iwai, Tamon Kabata, Toru Maeda, Yoshitomo Kajino, Shin Watanabe, Kazunari Kuroda, Kenji Fujita, Kazuhiro Hasegawa & Hiroyuki Tsuchiya

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  1. Shintaro Iwai
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  2. Tamon Kabata
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  3. Toru Maeda
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  4. Yoshitomo Kajino
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  5. Shin Watanabe
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  6. Kazunari Kuroda
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  7. Kenji Fujita
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  8. Kazuhiro Hasegawa
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  9. Hiroyuki Tsuchiya
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Correspondence to Tamon Kabata.

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Iwai, S., Kabata, T., Maeda, T. et al. Three-dimensional kinetic simulation before and after rotational acetabular osteotomy. J Orthop Sci 19, 443–450 (2014). https://doi.org/10.1007/s00776-014-0547-x

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  • DOI: https://doi.org/10.1007/s00776-014-0547-x

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