Lewis offset
Lewis Offset
Lewis Offset (pronunciation: LEW-is OFF-set) is a term used in the field of Orthopedics and Radiology to describe a specific measurement used in the evaluation of hip dysplasia. The term is named after Dr. John Lewis, who first described the measurement in the mid-20th century.
Etymology
The term "Lewis Offset" is derived from the name of Dr. John Lewis, an orthopedic surgeon who first described this measurement. The term "offset" refers to the distance measured in the evaluation of hip dysplasia.
Definition
Lewis Offset is a radiographic measurement used to assess the anteroposterior positioning of the femoral head in relation to the acetabulum. It is used as a diagnostic tool in the evaluation of hip dysplasia and other hip abnormalities.
Method of Measurement
The Lewis Offset is measured on an anteroposterior radiograph of the pelvis. A vertical line is drawn from the center of the femoral head to the teardrop figure on the same side. The distance from this line to the most medial aspect of the femoral head is the Lewis Offset.
Related Terms
- Hip Dysplasia: A condition where the hip socket does not fully cover the ball portion of the upper thighbone, leading to potential dislocation.
- Acetabulum: The socket of the hipbone, into which the head of the femur fits.
- Femoral Head: The highest part of the thigh bone (femur), which is rounded and fits into the acetabulum.
- Teardrop Figure: A radiographic feature seen on a pelvic x-ray, used as a reference point in various measurements.
External links
- Medical encyclopedia article on Lewis offset
- Wikipedia's article - Lewis offset
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