Medikrebs Charnley Retractor, which may also be known as the Initial Incision Retractor, is a self-retaining retractor, most commonly used during arthroplasty of the hip. It is used when initial incisions are made and maintains exposure of the hip area so the surgeon has an unobstructed view. The weight is approximately 3 1/2 pounds. Blades sizes: - 55 x 28 x 75 mm - 50 x 28 x 170 mm (angled) - 75 x 28 x85 mm - 75 x 28 x 170 mm.