Morphological findings in retrieved hip resurfacing arthroplasty. (A) Callus formation in chronic fracture. (B) Osteonecrosis (above) with bordering sclerosis (mid) and adjacent viable fatty bone marrow (lower) distal from the osteonecrotic lesion. (C) Excessive intraosseous lymphocyte infiltration in the vicinity of the bone-cement interface (above). (D) Hyperosteoidosis of bone trabecula at the bone-cement interface (above). (A-D: stain: Goldner trichrome, original magnification: ×200).