title: Quadriceps Strength and Endurance After Posterior Cruciate Ligament Tears Versus Matched Group With Anterior Cruciate Ligament Tears.
abstract: OBJECTIVE
  This study was designed to compare the preoperative strengths and endurances of the quadriceps and hamstring muscles in patients with anterior cruciate ligament (ACL) versus posterior cruciate ligament (PCL) tears.
  
  
  METHODS
  Quadriceps and hamstring muscle strength and endurance were compared between 20 prospectively enrolled patients with isolated PCL tears and a retrospective, matched control group of 20 patients with isolated ACL tears. The maximal torque (60°/s) and total work (180°/s) of the quadriceps and hamstring were evaluated with an isokinetic testing device.
  
  
  RESULTS
  Total work (1,094.4 ± 505.8 J v 797.5 ± 332.7 J, P = .035) and peak torque (129.9 ± 56.2 N ∙ m v 98.2 ± 37.4 N ∙ m, P = .046) of the quadriceps muscle on the involved side were higher in the PCL tear group than in the ACL tear group. However, there were no significant differences between the PCL tear group and ACL tear group in hamstring muscle strength (45.8 ± 42.3 N ∙ m and 46.0 ± 24.4 N ∙ m, respectively; P = .940) and endurance (429.3 ± 238.9 J and 382.4 ± 256.1 J, respectively; P = .574) on the involved side.
  
  
  CONCLUSIONS
  The strength and endurance of the quadriceps muscle of the injured limb were greater after PCL tears than after ACL tears. However, there were no significant between-group differences in hamstring muscle strength and endurance on the involved side.
  
  
  METHODS
  Level III, retrospective comparative study.
authors.affiliation: Department of Orthopaedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea; Sports Medical Center, Korea University College of Medicine, Seoul, Republic of Korea. Electronic address: eoak22@empal.com.
authors.forename: Dae-Hee
authors.initials: DH
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, Korea University College of Medicine, Seoul, Republic of Korea.
authors.forename: Seung-Beom
authors.initials: SB
authors.lastname: Han
authors.affiliation: Sports Medical Center, Korea University College of Medicine, Seoul, Republic of Korea.
authors.forename: Jin-Hyuck
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Sports Medical Center, Korea University College of Medicine, Seoul, Republic of Korea.
authors.forename: Seok-Joo
authors.initials: SJ
authors.lastname: Lee
authors.affiliation: Barunsesang Hospital, Seongnam, Republic of Korea.
authors.forename: Dong-Won
authors.initials: DW
authors.lastname: Suh
authors.affiliation: Sports Medical Center, Korea University College of Medicine, Seoul, Republic of Korea.
authors.forename: Hye-Jin
authors.initials: HJ
authors.lastname: Jeong
mesh_terms: D000293:Adolescent; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000601:surgery; D000070598:Anterior Cruciate Ligament Injuries; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000503:physiopathology / Q000601:surgery; D007719:Knee Joint / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000503:physiopathology; D016119:Posterior Cruciate Ligament / Q000293:injuries* / Q000601:surgery; D011446:Prospective Studies; D052097:Quadriceps Muscle / Q000503:physiopathology*; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D019415:Torque; D055815:Young Adult