Repair of the lateral posterior meniscal root improves stability in an ACL-deficient knee

Philipp Forkel, Constantin von Deimling, Lucca Lacheta, Florian B. Imhoff, Peter Foehr, Lukas Willinger, Felix Dyrna, Wolf Petersen, Andreas B. Imhoff, Rainer Burgkart

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


Purpose: To investigate the stabilizing effect of a lateral meniscus posterior root repair in an ACL and root deficient knee. Methods: The hypothesis of the current study was that a sequential transection of the posterior root and the meniscofemoral ligaments in an ACL-deficient knee increases rotational instability, and conversely, a repair of the meniscus root reduces the internal tibial rotation. Therefore, eight human knee joints were tested in a robotic setup (5 N m internal torque, 50 N m anterior translation load). Five conditions were tested: intact, ACL cut, ACL cut + lateral meniscus posterior root tear (LMRT), ACL cut + LMRT + transection of the MFL and ACL cut + lateral meniscus root repair. The angles of internal tibial rotation as well as anterior tibial translation were recorded. Results: Transection of the lateral meniscus posterior root increased the internal tibial instability as compared to the ACL-insufficient state. A significant increase was detected in 60° and 90° of flextion. Sectioning of the meniscofemoral ligament further destabilized the knees significantly at all flexion angles as compared to the ACL-deficient state. Even in 30°, 60° and 90° a significant difference was detected as compared to the isolated root tear. A tibial fixation of the lateral meniscus root reduced the internal tibial rotation in all flexion angles and led to a significant decrease of internal tibial rotation in 30° and 90° as compared to the transection of the root and the MFL. The anterior tibial translation was increased in all conditions as compared to the native state. Conclusion: A lateral meniscus root repair can reduce internal tibial rotation in the ACL-deficient knee. To check the condition of the lateral posterior meniscus root attachment is clinical relevant as a lateral meniscus root repair might improve rotational stability.

Original languageEnglish
Pages (from-to)2302-2309
Number of pages8
JournalKnee Surgery, Sports Traumatology, Arthroscopy
Issue number8
StatePublished - 1 Aug 2018


  • ACL tear
  • Lateral meniscus root tear
  • Meniscofemoral ligaments
  • Meniscus root repair


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