title: Evaluation of hamstring strength and tendon regrowth after harvesting for anterior cruciate ligament reconstruction.
abstract: BACKGROUND
  It is generally thought that tissue regeneration and good functional recovery can be expected after anterior cruciate ligament reconstruction using the hamstring tendons. However, persistent strength deficit in deep knee flexion has also been reported.
  
  
  OBJECTIVE
  Morphologic regeneration of the harvested hamstring tendon is not necessarily associated with its functional recovery.
  
  
  METHODS
  Retrospective follow-up study.
  
  
  METHODS
  Twenty-eight patients who underwent anterior cruciate ligament reconstruction with hamstring graft were evaluated after a minimum period of 2 years. Status of tendon regrowth was assessed by magnetic resonance imaging. To specifically analyze the functional deficit after graft harvest, the isometric hamstring strength was examined in a sitting position at 90 degrees of flexion and a prone position at 90 degrees and 110 degrees of flexion. Then, the strength data were correlated with the extent of tendon regeneration.
  
  
  RESULTS
  In 22 of the 28 patients, a regrowth of the semitendinosus tendon was found, whereas regeneration of the gracilis tendon was observed in 13 patients. In the evaluation of hamstring strength, the isometric peak torque was reduced to 86.2%, 54.6%, and 49.1%, respectively, in the aforementioned 3 postures as compared with the contralateral side.
  
  
  CONCLUSIONS
  Significant functional deficit of hamstring strength remains regardless of morphologic regeneration.
authors.affiliation: Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: Kou
authors.initials: K
authors.lastname: Tadokoro
authors.forename: Nobuzo
authors.initials: N
authors.lastname: Matsui
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Yagi
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kuroda
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kurosaka
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yoshiya
mesh_terms: D000293:Adolescent; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000601:surgery*; D000070598:Anterior Cruciate Ligament Injuries; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007718:Knee Injuries / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D018908:Muscle Weakness; D019637:Orthopedic Procedures; D019651:Plastic Surgery Procedures; D012189:Retrospective Studies; D013710:Tendons / Q000254:growth & development* / Q000637:transplantation*; D016896:Treatment Outcome; D016474:Weight-Bearing