title: Posteromedial meniscal tears may be missed during anterior cruciate ligament reconstruction.
abstract: OBJECTIVE
  This study aimed to assess the benefit of using an arthroscopic intercondylar view and a posterior medial viewing portal during anterior cruciate ligament (ACL) reconstruction in the diagnosis of posterior horn of the medial meniscus (PHMM) tears. A secondary objective was to determine clinical and radiological risk factors for the PHMM.
  
  
  METHODS
  Forty-one patients undergoing isolated ACL reconstruction were prospectively evaluated. At ACL reconstruction, the PHMM was assessed using a standard 30° arthroscope in 3 sequential stages: a "classic" anterolateral portal view, an intercondylar view, and a view through a posteromedial portal.
  
  
  RESULTS
  Thirty-nine patients were included (12 female patients and 27 male patients). A posteromedial tear of the medial meniscus was found in 17 patients using the anterolateral portal view. The intercondylar view identified 4 new additional lesions and extensions of 3 previously identified lesions. The posteromedial portal view identified 6 new lesions and 5 extensions of known lesions compared with the anterolateral portal view. Two lesions seen through the posteromedial portal were not identified by either the anterolateral portal view or the intercondylar view.
  
  
  CONCLUSIONS
  Tears of the PHMM may be underdiagnosed by intraoperative assessment using only an anterolateral portal view during ACL reconstruction. The intercondylar view combined with a posteromedial portal aids in the diagnosis of PHMM tears and should be considered in routine ACL reconstruction to assess meniscal status, particularly when the interval from injury to surgery is prolonged.
  
  
  METHODS
  Level IV, therapeutic case series.
authors: Albert Trillat Center, Groupement Hospitalier Nord,Université Lyon, Lyon, France.
authors: Adrien
authors: A
authors: Peltier
authors: Albert Trillat Center, Groupement Hospitalier Nord,Université Lyon, Lyon, France; Frankston Hospital, Frankston, Australia. Electronic address: tlording@iinet.net.au.
authors: Timothy D
authors: TD
authors: Lording
authors: Albert Trillat Center, Groupement Hospitalier Nord,Université Lyon, Lyon, France.
authors: Sébastien
authors: S
authors: Lustig
authors: Albert Trillat Center, Groupement Hospitalier Nord,Université Lyon, Lyon, France.
authors: Elvire
authors: E
authors: Servien
authors: François Rabelais University (IAE), Tours, France.
authors: Laurent
authors: L
authors: Maubisson
authors: Albert Trillat Center, Groupement Hospitalier Nord,Université Lyon, Lyon, France.
authors: Philippe
authors: P
authors: Neyret
mesh_terms: D000293:Adolescent; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000601:surgery; D059549:Anterior Cruciate Ligament Reconstruction / Q000009:adverse effects / Q000379:methods*; D020679:Arthroscopes; D001182:Arthroscopy; D003951:Diagnostic Errors / Q000517:prevention & control*; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000175:diagnosis* / Q000601:surgery*; D022125:Lacerations; D008297:Male; D008592:Menisci, Tibial / Q000601:surgery*; D008875:Middle Aged; D012421:Rupture; D000070600:Tibial Meniscus Injuries; D055815:Young Adult