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Permobil Blog / December 6, 2018

What in the construction of an offloading wheelchair cushion allows for pressure redistribution?

Blog-5-Title-WCG-Series

Part 5 in our Wound Care Guide seriesSee Part 1Part 2, Part 3, and Part 4Check out our comprehensive, digital Wound Care Guide here.


 

Through the built-in contours of an offloading style cushion, the therapist can help align and stabilize the spine, pelvis, and LEs to allow the pressure and shear forces to be transferred from a smaller surface area to a greater surface area. The contours needed for offloading pressure are:  

Cushion-Geometry_Deep-Posterior-Well

Deep Posterior Well

When combined with lateral tapered adductors, offloads and suspends the ITs, sacrum, and coccyx and loads the femurs.

Cushion-Geometry_Tapered-Adductors

Lateral Tapered Adductors

Align the LEs and prevent abduction and external rotation for maximum femoral loading. Assist to load the trochanters.

Cushion-Geometry_Abductor

Medial Abductor

Align the LEs and prevent adduction and internal rotation for maximum femoral loading.

 


 

What does a posterior pelvic well do?

  • Delineates where the pelvis is supposed to be on the cushion for stabilization and pressure redistribution
  • Works in combination with lateral tapered adductors
  • Loads the femurs
  • Offloads and suspends the ITs, sacrum, and coccyx

Posterior_Pelvic_Well_wheelchair_cushion


 

What do adductors do?

There are two styles of adductors, straight and tapered. They both provide LE alignment. Tapered adductors also have an offloading function for the pelvis.

Adductors

Straight Adductors

  • Can be rear, front, or entire length of cushion
  • Act as a boundary to assist with LE alignment
  • Prevent abduction of LEs

Straight_Adductors_wheelchair_cushion

What are the benefits of using straight adductors?

  • Provides proprioceptive input to the lateral surface of the legs to help with LE alignment

 

Tapered Adductors

  • Wider in the rear to form a shelf where the trochanters sit
  • Allows for loading of trochanters and femurs for pressure redistribution
  • Locks the head of the femur into the acetabulum, stabilizing the pelvis
  • Promotes offloading of the ITs, sacrum, and coccyx

Tapered_Adductors_wheelchair_cushions

What are the benefits of using tapered adductors?

  • Optimal offloading
  • Pelvic stability for patients with trunk and pelvic weakness
  • Prevents unwanted shifting in chair PLUS pressure redistribution

 

What does an abductor do?  

  • Minimizes adduction of LEs and promotes LE alignment
  • Helps create leg troughs when combined with adductors

Abductor_Equation


 

Through the contours of an offloading cushion, boundaries and borders are created that lock the head of the femur into the acetabulum. This helps to stabilize the pelvis and, in turn, the spine, and will align the pelvis and lower extremities to decrease the risk of the pelvis moving into unwanted postures.

Due to the predesignated shape, ALWAYS consider the anatomical shape of the patient and whether they “fit” into the predetermined contours. Often, a patient with very significant contractures such as a windswept deformity is not a good candidate for this style of cushion. If the patient does “fit” into the pre-contoured design, the construction of this style of cushion will add stability, alignment, and pressure distribution to protect the patient while simultaneously allowing maximum function!  Stay tuned next week when we discuss the principles of immersion.


Wound Care Guide


Ana Endsjo-1

Ana Endsjo
, MOTR/L, CLT
Clinical Education Manager LTC Division

Ana Endsjo has worked as an occupational therapist since 2001 in a variety of treatment settings. She has mainly worked with the geriatric population, dedicated to the betterment of the treatment of the elderly in LTC centers. Her focus has been on seating and positioning and contracture management of the nursing home resident. With this experience, her hope is to guide other therapists, rehab directors, nurses, and administrators through educational guides, blogs, webinars, and live courses in her role as Clinical Education Manager for the long term care division.

Categories: clinical education department, seating & positioning, Long Term Care, wheelchair seating

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