title: Does meniscus removal affect ACL-deficient knee laxity? An in vivo study.
abstract: OBJECTIVE
  The purpose of the present study was to determine, in vivo, the effect of different types of meniscectomy on an ACL-deficient knee.
  
  
  METHODS
  Using a computer-assisted navigation system, 56 consecutive patients (45 men and 11 women) were subjected to a biomechanical testing with Lachman test (AP30), drawer test (AP90), internal/external rotation test, varus/valgus rotation test and pivot-shift test. The patients were divided into three groups according to the status of the medial meniscus. Group BH, 8 patients with bucket-handle tear of medial meniscus underwent a subtotal meniscectomy; Group PHB, 19 patients with posterior horn body of medial meniscus tear underwent a partial meniscectomy; and Group CG with isolated ACL rupture, as a control group, with 29 patients.
  
  
  RESULTS
  A significant difference in anterior tibial translation was seen at 30 grades and in 90 grades between BH and PHB groups compared to the CG. In response to pivot-shift test, no significant differences in terms of AREA and POSTERIOR ACC were found among the three groups (n.s). Concerning the anterior displacement of the pivot shift a statistically significant differences among the three tested groups was found.
  
  
  CONCLUSIONS
  The present study shows that meniscal defects significantly affect the kinematics of an ACL-deficient knee in terms of anterior tibial translation under static and dynamic testing.
authors.affiliation: Laboratorio di Biomeccanica e Innovazione Tecnologica, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136, Bologna, BO, Italy.|Clinica Ortopedica e Traumatologica I, Istituto Ortopedico Rizzoli, Bologna, BO, Italy.|Dipartimento di Scienze Biomediche e Neuromotorie, Università di Bologna, Bologna, BO, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Zaffagnini
authors.affiliation: Laboratorio di Biomeccanica e Innovazione Tecnologica, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136, Bologna, BO, Italy. c.signorelli@biomec.ior.it.
authors.forename: C
authors.initials: C
authors.lastname: Signorelli
authors.affiliation: Laboratorio di Biomeccanica e Innovazione Tecnologica, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136, Bologna, BO, Italy.|Clinica Ortopedica e Traumatologica I, Istituto Ortopedico Rizzoli, Bologna, BO, Italy.
authors.forename: T
authors.initials: T
authors.lastname: Bonanzinga
authors.affiliation: Laboratorio di Biomeccanica e Innovazione Tecnologica, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136, Bologna, BO, Italy.|Clinica Ortopedica e Traumatologica I, Istituto Ortopedico Rizzoli, Bologna, BO, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Grassi
authors.affiliation: Instituto Dr. Jaime Slullitel, Rosario, Santa Fe, Argentina.
authors.forename: H
authors.initials: H
authors.lastname: Galán
authors.affiliation: Laboratorio di Biomeccanica e Innovazione Tecnologica, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136, Bologna, BO, Italy.|Clinica Ortopedica e Traumatologica I, Istituto Ortopedico Rizzoli, Bologna, BO, Italy.
authors.forename: I
authors.initials: I
authors.lastname: Akkawi
authors.affiliation: Laboratorio di Biomeccanica e Innovazione Tecnologica, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136, Bologna, BO, Italy.|Dipartimento di Scienze Biomediche e Neuromotorie, Università di Bologna, Bologna, BO, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Bragonzoni
authors.affiliation: Anestesia e terapia intensiva post operatoria e del dolore, Istituto Ortopedico Rizzoli, Bologna, BO, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Cataldi
authors.affiliation: Laboratorio di Biomeccanica e Innovazione Tecnologica, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136, Bologna, BO, Italy.|Clinica Ortopedica e Traumatologica I, Istituto Ortopedico Rizzoli, Bologna, BO, Italy.|Dipartimento di Scienze Biomediche e Neuromotorie, Università di Bologna, Bologna, BO, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Marcacci
mesh_terms: D000328:Adult; D016118:Anterior Cruciate Ligament; D000070598:Anterior Cruciate Ligament Injuries / Q000150:complications / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D007719:Knee Joint / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008592:Menisci, Tibial / Q000601:surgery*; D010808:Physical Examination; D000091402:Prohibitins; D016059:Range of Motion, Articular; D012399:Rotation; D013977:Tibia; D000070600:Tibial Meniscus Injuries / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D055815:Young Adult
keywords: ACL; Deficient knee; Laxity; Meniscectomy; Navigation system