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. 2018 Feb;26(2):434-441.
doi: 10.1007/s00167-017-4729-x. Epub 2017 Sep 30.

Improvement in the medial meniscus posterior shift following anterior cruciate ligament reconstruction

Hiroto Inoue  1 , Takayuki Furumatsu  2 , Shinichi Miyazawa  1 , Masataka Fujii  1 , Yuya Kodama  1 , Toshifumi Ozaki  1
Affiliations

Improvement in the medial meniscus posterior shift following anterior cruciate ligament reconstruction

Hiroto Inoue et al. Knee Surg Sports Traumatol Arthrosc. 2018 Feb.

Abstract

Purpose: Anterior cruciate ligament (ACL) reconstruction can reduce the risk of developing osteoarthritic knees. The goals of ACL reconstruction are to restore knee stability and reduce post-traumatic meniscal tears and cartilage degradation. A chronic ACL insufficiency frequently results in medial meniscus (MM) injury at the posterior segment. How ACL reconstruction can reduce the deformation of the MM posterior segment remains unclear. In this study, we evaluated the form of the MM posterior segment and anterior tibial translation before and after ACL reconstruction using open magnetic resonance imaging (MRI).

Methods: Seventeen patients who underwent ACL reconstructions without MM injuries were included in this study. MM deformation was evaluated using open MRI before surgery and 3 months after surgery. We measured medial meniscal length (MML), medial meniscal height (MMH), medial meniscal posterior body width (MPBW), MM-femoral condyle contact width (M-FCW) and posterior tibiofemoral distance (PTFD) at knee flexion angles of 10° and 90°.

Results: There were no significant pre- and postoperative differences during a flexion angle of 10°. At a flexion angle of 90°, MML decreased from 43.7 ± 4.5 to 41.4 ± 4.5 mm (P < 0.001), MMH from 7.5 ± 1.4 to 6.9 ± 1.4 mm (P = 0.006), MPBW from 13.1 ± 2.0 to 12.2 ± 1.9 mm (P < 0.001) and M-FCW from 10.0 ± 1.5 to 8.5 ± 1.5 mm (P < 0.001) after ACL reconstruction. The PTFD increased from 2.1 ± 2.8 to 2.7 ± 2.4 mm after ACL reconstruction (P = 0.015).

Conclusions: ACL reconstruction affects the contact pattern between the MM posterior segment and medial femoral condyle and can reduce the deformation of the MM posterior segment in the knee-flexed position by reducing abnormal anterior tibial translation. It possibly prevents secondary injury to the MM posterior segment and cartilage that progresses to knee osteoarthritis.

Level of evidence: IV.

Keywords: Anterior cruciate ligament reconstruction; Medial meniscus; Open magnetic resonance imaging; Posterior shift.

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References

    1. Ann Rheum Dis. 2005 Apr;64(4):556-63 - PubMed
    1. J Bone Joint Surg Br. 1986 Mar;68(2):292-6 - PubMed
    1. Knee Surg Sports Traumatol Arthrosc. 2017 Jan;25(1):236-244 - PubMed
    1. Clin Orthop Relat Res. 1985 Sep;(198):43-9 - PubMed
    1. Knee Surg Sports Traumatol Arthrosc. 2015 Sep;23 (9):2734-41 - PubMed

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