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Bone and Spine

Orthopedic health, conditions and treatment

What Is Femoral Offset?

By Dr Arun Pal Singh

Femoral offset is the distance from the center of rotation of the femoral head to a line dissecting the long axis of the femur. In case of total replacement of the hip, the offset is considered as the distance from the center of rotation of the femoral head to a line bisecting the long axis of the stem.

Normal femoral offset varies  between 30 amd 60 mm.

Femoral Offset
Image Credit: http://www.traumazamora.org/articulos/offset/offset.html

A decrease in femoral offset would move the femur closer to the pelvis medially.

This can lead to impingement of greater trochanter in extremes.  The medial movement would also result in soft tissue relaxation.  Both of these factors can lead to instability of the implant and possible dislocation.

Moreover, when the offset decreases, greater force is required by the abductor muscles to balance the pelvis and resultant force across the hip joint also increases resulting in greater wear and tear.

An increase in femoral offset moves the femur laterally resulting in decrease chances of impingement, a better tension in soft tissues and better stability.

A change in femoral offset does not affect the leg length and thus provides a measure to make an adjustment without altering the leg length the leg.

An increase in femoral offset decreases the force required by the abductor muscles to balance the pelvis, which will improve gait. As well, resultant force decreases with increased offset, which may result in less wear and loosening over time.

In total hip replacement surgery, the offset needs to be determined preoperatively for better planning of the surgery.

here is a strong correlation between femoral offset, abductors lever arm and hip abductor strength. Therefore, restoration of the femoral offset is essential to improve function and longevity of hip arthroplasty. Computed tomography scan is more accurate than plain radiography for the assessment of femoral offset.

 

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Filed Under: General Ortho

About Dr Arun Pal Singh

Arun Pal Singh is an orthopedic and trauma surgeon, founder and chief editor of this website. He works in Kanwar Bone and Spine Clinic, Dasuya, Hoshiarpur, Punjab.

This website is an effort to educate and support people and medical personnel on orthopedic issues and musculoskeletal health.

You can follow him on Facebook, Linkedin and Twitter

Reader Interactions

Comments

  1. Dr Ashish Dubey says

    January 25, 2016 at 7:58 am

    Wonderful attempt dr Arun !
    I appreciate !!

  2. Dr Arun Pal Singh says

    February 10, 2016 at 7:53 am

    Thank you Dr Ashish. Nice to have you here.

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