title: Adolescent anterior cruciate ligament reconstruction: a retrospective analysis of quadriceps strength recovery and return to full activity after surgery.
abstract: BACKGROUND
  This study was intended to provide quantitative assessment of quadriceps muscle recovery in adolescent athletes after anterior cruciate ligament (ACL) reconstruction.
  
  
  METHODS
  Quadriceps peak torque values from 55 athletes who underwent ACL reconstruction were analyzed. The mean age of the patients was 15.93+/-1.65 years (40 girls, 15 boys). Isokinetic data were obtained using the Biodex System 3. Quadriceps muscle recovery was defined as achieving >or=85% peak torque for side-to-side comparison.
  
  
  RESULTS
  Time-to-quadriceps muscle recovery was as follows: 15% by the end of 3 months, 11% by 4 months, 13% by 5 months, and 20% by 6 months. Overall, 32 patients (59%) achieved >or=85% quadriceps strength within 6 months of their surgery date. Of those patients, 16 (50%) patients returned to full activity within 6 months of the date of surgery. Sex was not found to be a significant difference in regard to strength outcomes.
  
  
  CONCLUSIONS
  Quadriceps muscle recovery is one criterion considered when allowing return to unrestricted activities after ACL reconstruction. On the basis of results of this study, middle and high school age athletes have the ability to regain the necessary quadriceps muscle strength required to return to sport within 6 months.
  
  
  CONCLUSIONS
  Using objective measures of quadriceps muscle return after ACL reconstruction can pinpoint timing of recovery, aid in specific training of deficient muscle groups, and guide return-to-play recommendations for those treating athletes with ACL reconstruction.
authors: Children's Hospital of Philadelphia, Division of Orthopaedic Surgery, Philadelphia, PA 19104, USA. wellsl@email.chop.edu
authors: Lawrence
authors: L
authors: Wells
authors: Julie Ann
authors: JA
authors: Dyke
authors: Jeffrey
authors: J
authors: Albaugh
authors: Theodore
authors: T
authors: Ganley
mesh_terms: D000293:Adolescent; D016118:Anterior Cruciate Ligament / Q000601:surgery*; D000070598:Anterior Cruciate Ligament Injuries; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D053580:Muscle Strength; D019637:Orthopedic Procedures / Q000379:methods*; D052097:Quadriceps Muscle; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D013177:Sports; D013997:Time Factors; D019415:Torque