offset

Surgical Technique

ApproachRevision TKR Tibial Lysis

 

Incision

 

Always use the most lateral scar

- blood supply comes from medial aspect

- want to avoid a large lateral flap of dubious quality

- cross transverse scars at 90o

- minimum 7 cm skin bridge

 

Options

- can do trial / sham incision down to capsule

Offset

Definition

 

The perpendicular distance from the centre of the femoral head to the long axis of the femur

 

Harris 1992

- aim for supra-physiologic offset 

- avoid making offset less than original at all costs & makes longer if possible

 

Soft tissue balancing equals restoring femoral offset

 

Effect of short offset

 

1.  Abductor lurch / Trendelenburg gait