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Evaluation of the permissible maximum angle of the tibial tunnel in transtibial anatomic posterior cruciate ligament reconstruction by computed tomography

  • Arthroscopy and Sports Medicine
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Excessive angle of the tibial tunnel may cause breakage of the posterior cortex in transtibial anatomic posterior cruciate ligament (PCL) reconstruction. However, a few studies have determined the permissible maximum angle of the tibial tunnel. The purpose of this study was to determine the permissible maximum angle of the tibial tunnel relative to the tibial plateau in transtibial anatomic PCL reconstruction and characterize the anatomic parameters of the tibial PCL attachment position.

Materials and methods

Computed tomography (CT) scans of a consecutive series of 408 adult knees with normal PCL attachment were measured. The parameters measured were the permissible maximum angle (PMA) of the 10 mm-diameter tibial tunnel relative to the tibial plateau, the distance from the anterior orifice of the tibial tunnel to the tibial tuberosity (OTD), the anterior–posterior diameter (APD) of the tibial plateau, the distance from the center of PCL attachment site to the posterior edge of the tibial plateau (PPED), and the angle between the tibial plateau and the posterior tibial slope where the PCL insertion site was (PSA). Subgroup analysis was performed to determine the correlations between parameters, and sex, age, and height. The measurement reliability was evaluated by intraclass correlation coefficients (ICCs).

Results

The average value of PMA was 48.2 ± 5.4°, and it was not affected by sex, age, and height (P > 0.05). The values of OTD, APD, PPED, PSA, and height were significantly higher in males than females (OTD, P < 0.01; APD, P < 0.01; PPED, P < 0.01; PSA, P = 0.019; height, P < 0.01). With regard to age, we stratified the cases into three groups: the young (18–30 years old), the middle-aged (31–45 years old), and the elderly (46–60 years old). The mean value of OTD, APD, and height were significantly lower in the elderly than that in the middle-aged (P < 0.01, P < 0.01, P < 0.01, respectively). With regard to height, we stratified the cases into three groups: ~ 1.65 m (1), 1.66 ~ 1.75 m (2), and 1.76 m ~ (3). The mean value of OTD, APD, and PPED significantly increased with height, P < 0.05. The mean value of PSA was significant higher in II group than that in I group (P = 0.034).

Conclusions

There should be a limit to the angle of the tibial tunnel in transtibial anatomic PCL reconstruction to prevent the fracture of posterior tunnel wall. The permissible maximum angle (PMA) of the 10 mm-diameter tibial tunnel relative to the tibial plateau was 48.2°. Besides, the determination of the value of OTD, APD, PPED, and PSA could provide a clinical reference to insertion site, depth, and angle of the tibial drill guide in PCL reconstruction.

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Funding

This study was financially supported by the Natural Science Foundation of China [81874017], the Cuiying Science and Technology Innovation Project of Lanzhou University Second Hospital [CY2017-ZD02; CY2017-QN12], and the Cuiying Scientific Training Program for Undergraduates of Lanzhou University Second Hospital [CYXZ-32].

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Author notes

  1. Yuanjun Teng and Xiaohui Zhang have contributed to the work equally and should be regarded as co-first authors.

Authors and Affiliations

  1. Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou University, No. 82 Cuiyingmen, Chengguan District, Lanzhou, 730030, Gansu, People’s Republic of China

    Yuanjun Teng, Xiaohui Zhang, Chongwen Ma, Haosen Wu, Rui Li, Hong Wang, Hua Han & Yayi Xia

  2. The Second Clinical Medical College of Lanzhou University, Lanzhou, 730030, Gansu, People’s Republic of China

    Yuanjun Teng, Xiaohui Zhang, Chongwen Ma, Haosen Wu, Rui Li, Hong Wang, Hua Han & Yayi Xia

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  1. Yuanjun Teng
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Correspondence to Yayi Xia.

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Teng, Y., Zhang, X., Ma, C. et al. Evaluation of the permissible maximum angle of the tibial tunnel in transtibial anatomic posterior cruciate ligament reconstruction by computed tomography. Arch Orthop Trauma Surg 139, 547–552 (2019). https://doi.org/10.1007/s00402-018-3092-9

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  • DOI: https://doi.org/10.1007/s00402-018-3092-9

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