Archives of orthopaedic and trauma surgery
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Arch Orthop Trauma Surg · Jan 1998
Measurement of skeletal flow with positron emission tomography and 18F-fluoride in femoral head osteonecrosis.
Positron emission tomography (PET) with 18F-fluoride was utilized to determine the regional blood flow to the femoral head in early osteonecrosis. Five patients with a history of unilateral hip trauma and a normal contralateral side were selected. ⋯ A minimum flow of 0.04 ml/min/ml was measured in one patient whose affected femoral head healed conservatively. Our preliminary study indicates that this type of highly technical investigation appears feasible in clinical practice and permits prediction of the outcome depending upon regional skeletal flow measurements in vivo.
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Arch Orthop Trauma Surg · Jan 1998
Clinical TrialPreservation of anterior cruciate ligament in total knee arthroplasty.
Few prostheses allow preservation of the anterior cruciate ligament (ACL) during total knee replacement. We report a short-term, prospective, open study of 32 ACL-retaining and 93 ACL-replacing total knee replacements and compare the respective outcomes of both prosthesis types with a follow-up time of 2-3 years. Mean operative time, complication or revision rates did not differ, nor did the early and late clinical and radiological evaluations. ⋯ The clinical and functional results were neither improved nor worsened for ACL-retaining prostheses. There is thus no advantage, but also no inconvenience, in retaining the ACL according to short- to mid-term results of a gliding posterior cruciate ligament (PCL)-retaining prosthesis with ACL-replacement design. The possibility of an improved long-term outcome of an ACL-retaining prosthesis should be investigated further.
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Arch Orthop Trauma Surg · Jan 1998
Case ReportsBilateral pathological femoral neck fractures secondary to ectopic parathyroid adenoma.
A rare case of bilateral pathological femoral neck fractures secondary to ectopic parathyroid adenoma is reported. Both hip fractures were treated with closed reduction and internal fixation. The right hip fracture healed uneventfully, whereas the left hip fracture developed non-union that required subtrochanteric osteotomy and internal fixation and eventually healed. Neither hip developed avascular necrosis.
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Arch Orthop Trauma Surg · Jan 1998
Comparative StudyEffects of nail rigidity on fracture healing. Strength and mineralisation in rat femoral bone.
The present study was undertaken to assess the effects of the rigidity of nails on the healing of fractures as evaluated by mechanical strength and rate of bone mineralisation. Ten rats supplied biomechanical data at the start of the experiment and another 100 rats were randomly assigned to 5 groups. In 20 rats no intervention was performed, and they served as a reference group of normal values. ⋯ This study demonstrates that diaphyseal fractures treated with titanium nails with a bending rigidity similar to the intact femur have a higher maximum bending load and fracture energy at 12 weeks than both rigidly or softly nailed fractures. BMD in the callus region was also highest after titanium nailing at 12 weeks. BMD in the distal diaphysis and total femur indicates that the degree of stiffness of the nails have little influence on total bone mineralisation at 12 weeks.
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Arch Orthop Trauma Surg · Jan 1998
Comparative StudyBiocompatibility of silicon carbide in colony formation test in vitro. A promising new ceramic THR implant coating material.
We studied the possible use of silicon carbide (SiC) as a ceramic coating material of titanium-based total hip replacement (THR) implants. The idea is to prevent wear debris formation from the soft titanium surface. ⋯ The present cytotoxicity test using JCRB0603 cells showed that 5 microns SiC particles inhibited colony outgrowth by one-third (67% + 10% vs control), while SiC-coated pins did not cause any inhibition and acted similarly to uncoated titanium pins. The results support the hypothesis that SiC is a promising ceramic THR implant coating material.