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Morphologic features of the hips, in particular those features germane to determination of acetabular and femoral anteversion angles and femoral head offset, were studied in 50 male and 50 female human skeletons with bilateral normal joints. Four distinct configurations were identified relative to the anterior acetabular ridge. The majority (121, 60.5%)(More)
The linear penetration rates for ceramic femoral heads on conventional and highly cross-linked polyethylene were measured and compared with radiographs taken in the standing and supine position taken three weeks postoperatively and at final follow-up. Seventy-five patients (83 hips) with conventional polyethylene (group-1) and two hundred and seventy five(More)
  • M Maruyama
  • 1997
In revision total knee arthroplasty, osteotomy of the tibial tubercle provided satisfactory exposure to extract the broken tibial metal tray with rigidly fixed stem easily and safely. Three patients (three knees) underwent this osteotomy and were followed for a minimum of 2 years (range 2 years and 2 months to 2 years and 8 months). All of the osteotomies(More)
BACKGROUND Broad dissection with a long skin incision and detachment of the gluteus medius muscle performed for rotational acetabular osteotomy (RAO) can result in weakness in abduction strength of the hip. We use a surgical procedure for RAO that minimizes operative invasion of soft tissue and reduces incision length compared with conventional procedures.(More)
OBJECTIVE Osteoarthritis (OA) and rheumatoid arthritis (RA) are widespread disabling joint disorders that are considered to be polygenic in nature. This study investigated the spatial expression patterns of all six known human CCN genes using end-stage OA and RA joint samples. DESIGN We performed in situ hybridization and histological analysis to(More)
Polyethylene wear is a major contributor to osteolysis and subsequent aseptic loosening of prosthetic components in total hip arthroplasty. Use of ion implantation as a surface modification to the metallic bearing component of orthopaedic implants may be an effective means of reducing wear debris at the bearing interface. In July 1991, low friction ion(More)
  • M Maruyama
  • 1997
An intramedullary hydroxyapatite (HA) plug was inserted in each tibia of five rabbits. Histological observation showed the presence of newly formed bone tissue bridging between the inner cortex and the HA plug at 3 months postoperatively. This new bone was in direct contact with the HA plug, and there was no fibrous tissue intervention. Based on these(More)
Fourteen hips in 14 patients (all female; average age, 64 years) with severe bone defects due to developmental dysplasia of the hip or migration of the socket were treated with hydroxyapatite block with impacted morselized bone graft in conjunction with a cemented socket. All patients were followed clinically in a prospective fashion, and radiographs were(More)