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Related Experiment Videos

Sagittal knee kinematics following hamstring lengthening.

Brian T Carney1, Donna Oeffinger, Anne Marie Meo

  • 1Shriners Hospitals for Children, Lexington KY, USA. bcarney58@hotmail.com

The Iowa Orthopaedic Journal
|June 23, 2006
PubMed
Summary

Hamstring lengthening in children with cerebral palsy decreased knee flexion during gait. Total knee range of motion increased, impacting overall sagittal knee kinematics post-surgery.

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Area of Science:

  • Orthopedics
  • Pediatric Rehabilitation
  • Movement Science

Background:

  • Cerebral palsy (CP) often involves spasticity affecting lower limb muscle function.
  • Hamstring muscle spasticity is a common impairment in CP, leading to altered gait patterns.
  • Hamstring lengthening surgery is performed to address this spasticity and improve function.

Purpose of the Study:

  • To analyze the effects of isolated hamstring lengthening on sagittal knee kinematics in children with cerebral palsy.
  • To evaluate changes in knee flexion and extension during gait cycles after surgery.
  • To compare pre-operative and post-operative gait parameters.

Main Methods:

  • Retrospective analysis of 16 children (32 knees) with cerebral palsy.
  • Gait analysis conducted before surgery and at least one year post-surgery.

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  • Focus on sagittal plane knee motion parameters including stance and swing phases.

    • Main Results:

    • A significant decrease was observed in stance maximum knee flexion.
    • Stance minimum knee flexion and swing maximum knee flexion were also reduced.
    • Total knee excursion demonstrated a notable increase following the procedure.
    • These findings confirm previous reports on altered knee kinematics post-hamstring lengthening.

    Conclusions:

    • Hamstring lengthening in pediatric cerebral palsy alters sagittal knee kinematics.
    • The surgery leads to reduced knee flexion during stance and swing phases.
    • Increased total knee excursion is a consistent outcome, potentially impacting gait efficiency and stability.