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Related Experiment Videos

Vulpius and Z-lengthening

D A Yngve1, C Chambers

  • 1Shriners Hospital for Crippled Children, Houston, Texas, USA.

Journal of Pediatric Orthopedics
|November 1, 1996
PubMed
Summary
This summary is machine-generated.

Both Vulpius and Z-lengthening procedures improved ankle function in cerebral palsy patients. Gait analysis showed similar, satisfactory outcomes for both gastrocnemius fascia and Achilles tendon lengthening surgeries one year post-operation.

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Area of Science:

  • Orthopedic Surgery
  • Pediatric Orthopedics
  • Biomechanical Analysis

Background:

  • Cerebral palsy (CP) often involves gait abnormalities, particularly equinus deformity.
  • Gastrocnemius fascia lengthening (Vulpius procedure) and Achilles tendon lengthening (Z-lengthening) are common surgical interventions.
  • Evaluating the functional outcomes of these procedures on ankle biomechanics is crucial for patient management.

Purpose of the Study:

  • To compare the effectiveness of Vulpius lengthening versus Z-lengthening of the Achilles tendon in improving ankle function in ambulatory cerebral palsy patients.
  • To analyze changes in ankle motion, moment, and power before and after surgical intervention.

Main Methods:

  • Gait analysis was performed on 33 ambulatory cerebral palsy patients before and approximately one year after surgery.

Related Experiment Videos

  • Patients underwent either Vulpius lengthening of the gastrocnemius fascia (n=22) or Z-lengthening of the Achilles tendon (n=27).
  • Simultaneous hip or knee surgeries were common; gait parameters included ankle motion, moment, and power.

    • Main Results:

    • Both surgical groups demonstrated improved ankle moments, approaching normal values post-operatively.
    • No significant differences in gait parameters were observed between the Vulpius and Z-lengthening groups at follow-up.
    • Significant improvements were noted within each group from pre- to post-operative measurements, including reduced abnormal midstance work (Vulpius) and decreased equinus with increased push-off work (Z-lengthening).

    Conclusions:

    • Both Vulpius lengthening and Z-lengthening of the Achilles tendon provide satisfactory and comparable outcomes for improving ankle function in ambulatory cerebral palsy patients.
    • These procedures lead to significant biomechanical improvements in ankle function one year after surgery.
    • The choice between Vulpius and Z-lengthening may not significantly impact functional ankle outcomes in this patient population.