title: Relationship between muscle volume and muscle torque of the hamstrings after anterior cruciate ligament lesion.
abstract: OBJECTIVE
  This study was conducted to identify factors other than morphological muscle strength factors that affect injured and uninjured sides of knee flexors with anterior cruciate ligament (ACL) lesions.
  
  
  METHODS
  The study population consisted of 22 patients with ACL lesions. Their hamstring muscle volume was measured on MRI, and muscle torque per muscle volume was calculated as the peak torque of knee flexion divided by hamstring muscle volume.
  
  
  RESULTS
  The mean muscle torque per unit volume of hamstrings in patients with ACL rupture was 0.09 ± 0.02 Nm/cm(3) at 60°/s and 0.08 ± 0.01 Nm/cm(3) at 180°/s on the injured side, and 0.11 ± 0.02 Nm/cm(3) at 60°/s and 0.08 ± 0.01 Nm/cm(3) at 180°/s on the uninjured side. The mean muscle torque per unit volume of hamstrings in control subjects was 0.11 ± 0.02 Nm/cm(3) at 60°/s and 0.08 ± 0.03 Nm/cm(3) at 180°/s. One-factor ANOVA analysis found no significant differences between the three groups at either flexion velocity.
  
  
  CONCLUSIONS
  Neurological dysfunction does not appear to exist in knee flexor muscles after ACL injury, unlike the quadriceps. Since the mechanism of muscle weakness will differ depending on the muscle, it is important for clinicians to take this discrepancy into consideration.
  
  
  METHODS
  II.
authors.affiliation: Department of Physical Education, National Defence Academy, 1-10-20 Hashirimuzu, Yokosuka City, Kanagawa, 239-8686, Japan. yu_57@yahoo.co.jp
authors.forename: Yu
authors.initials: Y
authors.lastname: Konishi
authors.forename: Ryuta
authors.initials: R
authors.lastname: Kinugasa
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Oda
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tsukazaki
authors.forename: Toru
authors.initials: T
authors.lastname: Fukubayashi
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D000070598:Anterior Cruciate Ligament Injuries; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000503:physiopathology; D008279:Magnetic Resonance Imaging; D008297:Male; D053580:Muscle Strength / Q000502:physiology; D018908:Muscle Weakness / Q000503:physiopathology; D018482:Muscle, Skeletal / Q000033:anatomy & histology* / Q000502:physiology*; D019415:Torque