- Discussion:
- see acetabular component, reestablishment of acetabular floor, and component position;
- see: preoperative and post operative radiographic eval
- femoral offset is measured from the distance between the center of the femoral head and a line drawn down center of femoral shaft;
- note that increasing offset may have the unwanted effect of increasing rotational torque on the stem (leading to aseptic loosening);
- offset may be increased by:
- increasing stem varus from the typical 135 deg;
- references:
- Are Gender-specific Femoral Stems Needed?
- The effectiveness of dual offset stems in restoring offset during total hip replacement
- Do post-operative changes of neck-shaft angle and femoral component anteversion have an effect on clinical outcome following uncemented total hip arthroplasty?
- lateralization:
- shifting the neck trunion medially;
- lateralization of the femoral shaft restores offset, reduces femoropelvic impingement, and increases abductor tension.
- lateralization also increases the lever arm for the abductor muscles;
- lateralization may be required with medialization of the cup
- increasing modular neck length (which will also increase verticle offset and leg length)
- references:
- Effect of femoral component offset on polyethylene wear in total hip arthroplasty.
- Benefit of cup medialization in total hip arthroplasty is associated with femoral anatomy
- The anatomic basis for concept of lateralized femoral stems: a frontal plane radiographic study of proximal femur.
- Total hip replacement: increasing femoral offset improves functional outcome
- references:
- Total hip replacement: increasing femoral offset improves functional outcome.
- A relationship between stem orientation and function following total hip arthroplasty.
- Femoral component offset. Its effect on strain in bone-cement.
- Effect of femoral offset on range of motion and abductor muscle strength after total hip arthroplasty.
- Reconstructed Hip Joint Position and Abductor Muscle Strength After Total Hip Arthroplasty.
- The influence of femoral offset on health-related quality of life after total hip replacement
- Managing Length and Stability: The Role of the Modular Neck
- Effect of femoral offset on pain and function after total hip arthroplasty.
- Total hip arthroplasty: leg length inequality impairs functional outcomes and patient satisfaction.
- Femoral offset: Anatomical concept, definition, assessment, implications for preoperative templating and hip arthroplasty
- The effect of femoral offset modification on gait after total hip arthroplasty
- see acetabular component, reestablishment of acetabular floor, and component position;
- see: preoperative and post operative radiographic eval
- femoral offset is measured from the distance between the center of the femoral head and a line drawn down center of femoral shaft;
- note that increasing offset may have the unwanted effect of increasing rotational torque on the stem (leading to aseptic loosening);
- offset may be increased by:
- increasing stem varus from the typical 135 deg;
- references:
- Are Gender-specific Femoral Stems Needed?
- The effectiveness of dual offset stems in restoring offset during total hip replacement
- Do post-operative changes of neck-shaft angle and femoral component anteversion have an effect on clinical outcome following uncemented total hip arthroplasty?
- lateralization:
- shifting the neck trunion medially;
- lateralization of the femoral shaft restores offset, reduces femoropelvic impingement, and increases abductor tension.
- lateralization also increases the lever arm for the abductor muscles;
- lateralization may be required with medialization of the cup
- increasing modular neck length (which will also increase verticle offset and leg length)
- references:
- Effect of femoral component offset on polyethylene wear in total hip arthroplasty.
- Benefit of cup medialization in total hip arthroplasty is associated with femoral anatomy
- The anatomic basis for concept of lateralized femoral stems: a frontal plane radiographic study of proximal femur.
- Total hip replacement: increasing femoral offset improves functional outcome
- references:
- Total hip replacement: increasing femoral offset improves functional outcome.
- A relationship between stem orientation and function following total hip arthroplasty.
- Femoral component offset. Its effect on strain in bone-cement.
- Effect of femoral offset on range of motion and abductor muscle strength after total hip arthroplasty.
- Reconstructed Hip Joint Position and Abductor Muscle Strength After Total Hip Arthroplasty.
- The influence of femoral offset on health-related quality of life after total hip replacement
- Managing Length and Stability: The Role of the Modular Neck
- Effect of femoral offset on pain and function after total hip arthroplasty.
- Total hip arthroplasty: leg length inequality impairs functional outcomes and patient satisfaction.
- Femoral offset: Anatomical concept, definition, assessment, implications for preoperative templating and hip arthroplasty
- The effect of femoral offset modification on gait after total hip arthroplasty