Circumduction in Prosthetic Limbs

Definition

• Circumduction: Movement characterized by a wide arc made by the prosthetic limb.
  • Occurs in the transverse plane.
  • Best viewed in the coronal plane.

Causes of Circumduction

• Knee Flexion Resistance:

  • Extreme flexion resistance or limitations in flexion require circumduction for floor-foot clearance during the swing phase.
  • Adjustment: Careful adjustment of the knee's flexion resistance is necessary to prevent deviation.

• Antalgic Gait Mechanism:

  • Occurs when the medial brim of the socket impinges on tissues during swing phase.
  • Factors: Improper brim radius or excessively high medial brim.

• Prosthesis Length:

  • Excessively lengthened prosthesis can lead to circumduction.
  • Solution: Examine components and socket fit to determine if length is causing the deviation.

• Extension Assist:

  • A too strong extension assist may also result in circumduction.

Key Considerations

• Proper adjustment and fitting of prosthetic components are crucial to prevent circumduction.
• Regular examination of the prosthetic limb's components and fit can help identify issues leading to circumduction.