Bioabsorbable screw fixation for the treatment of ankle fractures.

Background: Self-reinforced poly(L/dL)lactide 70:30 (SR-PLA70) retains its strength in bone for 24 weeks, whereas self-reinforced poly-L-lactide (SR-PLLA) retains its strength for over 36 weeks. In this prospective randomized study, bioabsorbable 4.5-mm SR-PLA70 screws were compared with SR-PLLA screws in the treatment of displaced ankle fractures in adults.

Bone mineral density after removal of rigid plates from forearm fractures: preliminary report.

Bone mineral density (BMD) was measured on three occasions following removal of metal plates used to fixate diaphyseal forearm fractures in eight patients (mean age 38.5 years). At plate removal the mean BMD of the distal radius/ulna and the ulnar shaft sites were, respectively, 10.

Bone mineral density after the removal of intramedullary nails: a cross-sectional and longitudinal study.

We measured bone mineral density (BMD) using dual X-ray absorptiometry (DXA) at several sites in both fractured and nonfractured limbs in eight patients with femoral shaft fracture and six with tibial shaft fracture at the time of the intramedullary (IM) nail removal. Seven patients were followed up for an average of 13 months. The BMD at the proximal part of the femur and tibia was from 3% to 11% lower in the fractured side as compared to the nonfractured side.

Clinical and roentgenographic results of cementless total hip arthroplasty.

A retrospective clinical and roentgenographic review was performed on 69 consecutive cementless total hip arthroplasties that had been in situ for an average of 64.4 months (range, 57-91 months). Four patients had bilateral operations.

Fracture repair during external fixation. Torsion tests of rabbit osteotomies.

Bone repair was studied in the rabbit tibiofibular bone after a midshaft transverse osteotomy stabilized by external fixation and heavy compression. Both subendosteal and subperiosteal callus formation with concomitant contact healing were observed within 3 weeks, and were further succeeded by subendosteal resorption and increased porosis resulting in atrophy of the cortical bone. Subjected to the torsion test, the bones exhibited restoration of strength within 3 weeks, with maximal energy absorption and elasticity at 6 weeks.

Treatment of pseudarthrosis of the clavicle.

Twelve patients were operated on between 1974 and 1979 for painful pseudarthrosis of the clavicle. The time from the injury to the operation ranged from 4 months to 12 years. We used an AO plate fixation and cancellous bone graft.

Biochemical changes in bone grafts stabilized with rigid plates. II. Cortical grafts.

The effect of rigid plate fixation on the chemical composition of cortical interposition grafts were studied in rabbit tibio-fibular bones. The concentration of hexosamines increased both in the graft and in the host bone during the first 6 weeks, but thereafter decreased. The concentrations of hydroxyproline and nitrogen increased throughout the experiment.