title: An evaluation of reconstructed ACL impingement on PCL using MRI.
abstract: Using magnetic resonance imaging (MRI), we evaluated 42 reconstructed anterior cruciate ligaments (ACLs) for impingement on corresponding posterior cruciate ligaments (PCLs) in the knee-extended position. Thirty-one single-bundle ACL reconstructions and 11 double-bundle ACL reconstructions were performed. MR examinations were performed at 3 and 12 months after arthroscopic ACL reconstructions. Using oblique axial MRIs of reconstructed ACLs, we evaluated the shape of the PCL and divided them into two groups: an impingement-positive group and an impingement-negative group. Using sagittal images, we measured the PCL index (Liu's method) and examined the correlation between the degree of impingement and the index. At 3 months after surgery, 14 of 31 single-bundle ACL reconstructions and 5 of 11 double-bundle ACL reconstructions were regarded as positive impingement on PCLs. At 12 months after surgery, 17 of 31 single-bundle ACL reconstructions and 5 of 11 double-bundle ACL reconstructions were regarded as positive impingement on PCLs. At 3 months in single-bundle reconstructions and at 3 and 12 months in all reconstructions, the PCL index of the impingement-positive group was significantly lower than that of the negative group. This study indicated that reconstructed ACLs in the impingement-positive group pressed the PCLs more posteriorly than did the impingement-negative group.
authors.affiliation: Department of Orthopedic Surgery, JA Onomichi General Hospital, 7-19 Kohama-cho, Onomichi, Hiroshima 722-8508, Japan. mako7119@yahoo.co.jp
authors.forename: Makoto
authors.initials: M
authors.lastname: Nishimori
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Sumen
authors.forename: Kazuki
authors.initials: K
authors.lastname: Sakaridani
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Nakamura
mesh_terms: D000293:Adolescent; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000473:pathology / Q000601:surgery*; D001182:Arthroscopy; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D016119:Posterior Cruciate Ligament / Q000473:pathology*; D011183:Postoperative Complications / Q000175:diagnosis*; D018709:Statistics, Nonparametric