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Intercondylar notch size influences cyclops formation after anterior cruciate ligament reconstruction

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The purpose of this study was to investigate the incidence of cyclops lesions and its relationship with the cross-sectional area of the intercondylar notch.

Methods

For this study, 55 patients (24 male and 31 female) underwent follow-up arthroscopy after bi-socket anterior cruciate ligament reconstruction with hamstring tendon grafts were included. All patients underwent magnetic resonance imaging measurements of intercondylar notch dimensions. We compared the femoral intercondylar notch sizes and bone tunnel sizes between knees with cyclops lesions (cyclops group) and those without cyclops lesions (no-cyclops group). The mean percentage of the tunnel size to the cross-sectional area of the femoral intercondylar notch was also compared between the groups. The median follow-up duration was 3.8 years.

Results

Cyclops lesions were found in 15 of the 55 knees (27.3 %) on second-look arthroscopy (cyclops group). Only 6 of the 55 knees (10.9 %) had extension loss (cyclops syndrome). The cyclops group included 3 men and 12 women. The two groups showed a statistical difference in sex variation (P = 0.04). No significant differences were found in the femoral and tibial tunnel sizes between the two groups. The cross-sectional area of the femoral intercondylar notch was significantly smaller in the cyclops group (251.7 ± 63.2 mm2) than in the no-cyclops group (335.6 ± 77.6 mm2) (P < 0.001). The percentage of the total femoral tunnel size to the cross-sectional area of the femoral intercondylar notch was significantly higher in the cyclops group (18.6 ± 5.3 %) than in the no-cyclops group (13.2 ± 3.6 %) (P = 0.02).

Conclusions

A smaller intercondylar notch size may be a potential risk factor for cyclops lesion formation.

Level of evidence

Case–control study, Level IV.

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Acknowledgments

We thank Ms. Aki Yoshida, Ms. Reina Tanaka, and Ms. Emi Matsumoto for their technical cooperation. This work was supported by the grant from Japan Society for the Promotion of Science (No. 24791546, T.F.).

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Science of Functional Recovery and Reconstruction, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8558, Japan

    Masataka Fujii, Takayuki Furumatsu, Shinichi Miyazawa, Yukimasa Okada, Takaaki Tanaka & Toshifumi Ozaki

  2. Department of Orthopaedic Surgery and Sport Medicine, Kawasaki Medical School, 2-1-80 Nakasange, Kita-ku, Okayama, 700-8505, Japan

    Nobuhiro Abe

Authors
  1. Masataka Fujii
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  2. Takayuki Furumatsu
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  4. Yukimasa Okada
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Correspondence to Takayuki Furumatsu.

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Fujii, M., Furumatsu, T., Miyazawa, S. et al. Intercondylar notch size influences cyclops formation after anterior cruciate ligament reconstruction. Knee Surg Sports Traumatol Arthrosc 23, 1092–1099 (2015). https://doi.org/10.1007/s00167-014-2891-y

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  • DOI: https://doi.org/10.1007/s00167-014-2891-y

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