Skeletal Radiology

, Volume 48, Issue 9, pp 1439–1442 | Cite as

Isolated posterior cruciate ligament aplasia: a case report

  • Nicolás GarcíaEmail author
  • A. Debandi
  • G. Delgado
  • J. Rosales
  • M. Verdugo
Case Report


Congenital absence of the cruciate ligaments is a very rare condition, with most reported cases being related to the anterior cruciate ligament (ACL). Posterior cruciate ligament (PCL) congenital abnormalities have been described as almost always being associated with other anomalies. We present a case of a patient with lateral knee pain and subjective instability sensation after a low-energy trauma secondary to a lateral meniscus tear, with absence of the PCL on MRI examination and thickened meniscofemoral ligaments, with anterior and superior insertion at the femur, in the footprint of PCL. The patient had a menisci repair, without PCL reconstruction. At the 6-month follow-up, the patient did not report any instability symptoms during his daily work and sports activities. There are therapeutic implications in distinguishing a chronic PCL tear from an aplasia, so it is important to detect some signs in imaging that may guide to differentiate them, as there could be differences in the course and thickness of meniscofemoral ligaments, besides the absence of the entire PCL. To our knowledge, this is the first case of PCL agenesis with arthroscopic correlation.


Posterior cruciate ligament Agenesis Knee stability Embryology 


Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.


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Copyright information

© ISS 2019

Authors and Affiliations

  • Nicolás García
    • 1
    Email author
  • A. Debandi
    • 2
  • G. Delgado
    • 1
  • J. Rosales
    • 1
  • M. Verdugo
    • 1
  1. 1.Skeletal Radiology DepartmentClínica MEDSSantiagoChile
  2. 2.Knee Orthopedic Surgery DepartmentClínica MEDSSantiagoChile

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