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Sagittal knee kinematics after hamstring lengthening.

Brian T Carney1, Donna Oeffinger, Anne Marie Meo

  • 1Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA. bcarney58@hotmail.com

Journal of Pediatric Orthopedics. Part B
|August 8, 2006
PubMed
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Hamstring lengthening in children with cerebral palsy reduced knee flexion during gait. Total knee range of motion increased, impacting overall knee movement and control after surgery.

Area of Science:

  • Orthopedic surgery
  • Pediatric gait analysis
  • Cerebral palsy research

Background:

  • Cerebral palsy often involves spasticity affecting lower limb muscle function.
  • Hamstring contractures are common in cerebral palsy, impacting gait mechanics.
  • Hamstring lengthening surgery aims to improve range of motion and gait in affected children.

Purpose of the Study:

  • To analyze the impact of hamstring lengthening on sagittal knee kinematics.
  • To evaluate changes in knee flexion and excursion following isolated hamstring lengthening surgery.
  • To confirm previous findings on knee motion after this specific surgical intervention.

Main Methods:

  • Retrospective analysis of 16 children (32 knees) with cerebral palsy.
  • Gait analysis performed pre-operatively and at least 1 year post-operatively.

Related Experiment Videos

  • Focus on sagittal plane knee motion, including flexion and excursion during gait.

    • Main Results:

    • Significant decrease in stance maximum knee flexion.
    • Reduced stance minimum knee flexion and swing maximum knee flexion observed.
    • Total knee excursion was found to increase post-surgery.
    • Findings confirmed prior reports of increased total knee excursion.

    Conclusions:

    • Hamstring lengthening in pediatric cerebral palsy leads to altered knee kinematics.
    • The surgery results in reduced knee flexion during stance and swing phases.
    • Increased total knee excursion is a consistent outcome, requiring further consideration in gait management.