Archives of orthopaedic and trauma surgery
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Arch Orthop Trauma Surg · Jan 1991
Comparative StudyQuantitative comparison of the histological effects of particulate polymethylmethacrylate versus polyethylene in the rabbit tibia.
Fourteen mature female New Zealand White rabbits underwent implantation of Simplex polymethylmethacrylate (PMMA) powder or particulate (average 67 microns) ultrahigh-molecular-weight polyethylene (UHMWPE) through a drill hole in the proximal right tibia. The left tibia functioned as a prepared but nonimplanted control. Animals were killed after 16 weeks. ⋯ The particulate UHMWPE group demonstrated positively birefringent UHMWPE fragments, rimmed by foreign-body giant cells and histiocytes, embedded in a loose connective tissue stroma. UHMWPE interfaces were thicker and contained more histiocytes and fibrocytes; PMMA interfaces contained more marrow cells and lymphocytes. This study underscores the importance of biomaterial debris in the process of aseptic loosening of cemented joint arthroplasties.
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Arch Orthop Trauma Surg · Jan 1991
Intramedullary wiring for tibial shaft fractures in children before epiphyseal closure. Indications and technique--experience of 36 patients.
Between 1958 and 1987 36 children underwent intramedullary wiring for tibial shaft fractures. Of these, 29 presented with combined tibial and fibular fractures, and 7 showed isolated tibial shaft fractures. Fractures were simple in 22 and compound in 14 patients. ⋯ Malalignment showed a tendency towards spontaneous correction, which decreased with increasing age. Correction surgery proved to be unnecessary. Differential longitudinal growth was not consistently evaluable because of the heterogeneity of the material; reported data on this parameter from the literature were equally inconclusive.(ABSTRACT TRUNCATED AT 250 WORDS)
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Arch Orthop Trauma Surg · Jan 1991
Case ReportsBilateral stress fracture of the scaphoid. A case report.
Bilateral stress fractures of the scaphoid bones in a gymnast are reported and discussed with special consideration of the possible differential diagnoses; bipartite scaphoid and pseudarthrosis of the scaphoid bone. The relevance of the mechanical factors involved and the abduction and dorsiflexion of the wrist in gymnastics are suggested as likely pathomechanisms.
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Arch Orthop Trauma Surg · Jan 1991
Operative procedure using the improved osteosynthesis technique for intertrochanteric osteotomies. Preliminary report.
Employing a simple sawing gauge system in intertrochanteric osteotomies, it is possible to effect "functional pre-bending" of the angled blade plate osteosynthesis in order to achieve better interfragmentary compression and further improve the precision of the standardized AO technique. This new technique may lead to a further reduction of intraoperative and post-operative failures.