Version refers to the angle of femoral neck in relationship to the shaft of the femur. Extreme excessive version may require surgical correction, such as a procedure known as an osteotomy, which involves breaking and realigning the femur.
Femoral anteversion is a condition in which the femoral neck is excessively rotated forward on the femoral shaft. Excessive anteversion overloads the anterior structures of the hip joint, including the labrum and capsule, and can cause snapping.
Femoral retroversion is a condition in which the femoral neck is rotated backward on the femoral shaft. Femoral retroversion can result in the crushing of the labrum.