Fig. 16From: Postoperative radiograph of the hip arthroplasty: what the radiologist should knowAP radiograph. Cementless total hip arthroplasty. A < 2 mm lucency, outlined by a discrete sclerotic margin, in Gruen zone 3/4 (arrowheads): this indicates a fibrous rather than bony ingrowth, thought to provide sufficient stabilityBack to article page