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Comparison of bone healing by demineralized bone matrix and autogenous cancellous bone in horses.

OBJECTIVE: The purpose of this study was to compare bone healing induced by equine demineralized bone matrix (DBM) to autogenous cancellous bone graft (ACB) or no graft (control) in a rib-defect model in horses. STUDY DESIGN: The osteogenic properties of ACB and DBM were evaluated in bilateral 19-mm circular defects created in the outer cortex of the 6th and 8th ribs of each horse. ANIMALS OR SAMPLE POPULATION: Eight mature horses. METHODS: Three rib defects in each horse were randomly treated with each of the 3 treatment groups, and the fourth rib defect received a random treatment. Rib sections, including the defects, were harvested 56 days after implantation and examined for bone mineral density, percent ash and calcium and graded for signs of radiographic and histological healing. RESULTS: All ribs were fractured at the defect site and were classified as nonunion fractures 56 days after implantation. There were no significant differences among groups in bone mineral density and signs of radiographic or histological healing. There was an increased volume of bone in control and ACB-treated sites compared with DBM-treated sites. Rib defects treated with ACB were significantly higher in percent ash and calcium than those treated with DBM. DBM elicited no inflammatory reaction, and remodeling occurred around the periphery and within vascular channels of the decalcified particles. CONCLUSION: DBM particles remodel from the periphery, which may explain the significantly lower percent ash, calcium, and bone when compared with ACB, because 2- to 4-microL pieces of DBM may act as space-occupying masses until completely mineralized. There was no evidence of enhanced healing associated with the use of DBM in this model. CLINICAL RELEVANCE: Particles of 2 to 4 mm DBM should not be used as an aid to fracture repair because particles of this size interfere with normal mineralization. However, our model of nonunion fracture healing may be useful in future studies.

Animals↗
PubMed1982

Dialysis encephalopathy and osteomalacic bone disease: a case-controlled study.

Nine patients on long-term hemodialysis with dialysis encephalopathy were studied, with sex matched control subjects for eight of the patients. Each patient with dialysis encephalopathy and control subject were contemporaries in a similar dialysis environment. Rib and other fractures were found in excess in the patients with dialysis encephalopathy (p less than 0.005 and p less than 0.01). These patients had less radiographic hyperparathyroid bone disease, and no more osteopenia as measured by metacarpal thickness than did their control counterparts. Severe osteomalacia was documented by bone biopsy in four of te patients. In a retrospective review of clinical, biochemical and pharmacologic differences, the patients with dialysis encephalopathy were significantly older at the start of dialysis (45.6 years versus 38.6 years, p less than 0.02) and had higher mean concentrations of blood urea nitrogen (BUN) and lower serum hemoglobin in the first year of dialysis than the control subjects. Blood pressure weight, creatinine, calcium, phosphate, alkaline phosphatase and a number of transfusions did not differ significantly. There was no difference in prescribed vitamin D and elemental aluminum in phosphate binders. This study demonstrates that patients with dialysis encephalopathy had more rib fractures without more parathyroid or osteopenic bone disease than did the control subjects and suggests that the etiology of dialysis encephalopathy and osteomalacia is multifactorial.

Adult↗
PubMed2001

Effects of high-dose etidronate treatment on microdamage accumulation and biomechanical properties in beagle bone before occurrence of spontaneous fractures.

We recently demonstrated that suppressed bone remodeling allows microdamage to accumulate and causes reductions in some mechanical properties. However, in our previous study, 1 year treatment with high-dose etidronate (EHDP) did not increase microdamage accumulation in most skeletal sites of dogs in spite of complete remodeling suppression and the occurrence of spontaneous fractures of ribs and/or thoracic spinous processes. This study evaluates the effects of EHDP on microdamage accumulation and biomechanical properties before fractures occur. Thirty-six female beagles, 1-2 years old, were treated daily for 7 months with subcutaneous injections of saline vehicle (CNT) or EHDP at 0.5 (E-low) or 5 mg/kg per day (E-high). After killing, bone mineral measurement, histomorphometry, microdamage analysis, and biomechanical testing were performed. EHDP treatment suppressed intracortical and trabecular remodeling by 60%-75% at the lower dose, and by 100% at the higher dose. Osteoid accumulation caused by a mineralization deficit occurred only in the E-high group, and this led to a reduction of mineralized bone mass. Microdamage accumulation increased significantly by two- to fivefold in the rib, lumbar vertebra, ilium, and thoracic spinous process in E-low, and by twofold in the lumbar vertebra and ilium in E-high. However, no significant increase in damage accumulation was observed in ribs or thoracic spinous processes in E-high where fractures occur following 12 months of treatment. Mechanical properties of lumbar vertebrae and thoracic spinous processes were reduced significantly in both E-low and E-high. These findings suggest that suppression of bone remodeling by EHDP allows microdamage accumulation, but that osteoid accumulation reduces production of microdamage.

Animals↗
PubMed1993

Risk factors for fractures due to falls.

A matched case-control study was carried out to identify risk factors for fractures due to falls. All falls that occurred at a rehabilitation hospital from 1981 to 1988 were identified and classified as index falls (falls resulting in fractures) or referent falls (falls not resulting in fractures). For each of the 94 index falls, four referent falls were chosen at random (n = 376) from all other falls occurring in the same four week period. The average age of the individuals sustaining the index fall was 76.8 +/- 10.4 years, and 68% were female; in contrast, the average age of the individuals sustaining the referent fall was 72.0 years (+/- 13.2), and 32% were female. Fractures of the hip predominated (n = 40; 42.6%) and fractures of the ribs were the second most prevalent (n = 20; 21.4%). Fractures most often ensured from a fall from the upright position. Of the 24 variables considered in the conditional logistic regression model, advanced age, being female, being ambulatory, experiencing disorientation, use of vitamin supplements, and use of antiulcer medications were significantly associated with the risk of a fracture. Thus, because fractures are potentially life-threatening, strategies to prevent falls should be targeted especially towards those who are at risk to sustain a fracture from a fall. However, to be compatible with rehabilitation goals, the preventive strategies must strike a balance between the achievement of functional autonomy and patient safety.

Accidental Falls↗
PubMed1981

Acute traumatic disruption of the thoracic aorta: a ten-year experience.

During a ten-year period, 44 patients were treated for acute traumatic disruption of the thoracic aorta. Of the 44 patients, 21 had operative repair within 48 hours of injury (Group 1); 14 patients had operative therapy electively delayed for 2 to 79 days (Group 2); 5 had operative therapy electively delayed indefinitely (Group 3); 2 had immediate operative repair when a delayed diagnosis was made at 21 and 56 days, respectively (Group 4); 1 patient died during angiography and 1 refused operation (Group 5). Mortality was as follows: Group 1, 24%; Group 2, 14% Group 3, 0; Group 4, 100%; and Group 5, 100%. All operative deaths occurred in the subgroup of 23 patients in whom left heart bypass was utilized. Immediate operative intervention with a heparinized shunt is preferable as soon as the diagnosis of thoracic aortic disruption has been established, but elective delay of operation in patients with severe concomitant injuries can be achieved safely with beta blockade and antihypertensive therapy.

Accidents, Traffic↗
PubMed1997

Chylothorax as a manifestation of child abuse.

OBJECTIVE: Chylothorax presenting in a child without a well defined etiology may be a manifestation of child abuse. We recently observed a child with bilateral chylothoraces who demonstrated coexisting nonaccidental injuries. It is our intention to alert physicians to the association of chylothorax with nonaccidental trauma and review the prior medical literature. DESIGN: Case report. SETTING: Pediatric emergency department and intensive care unit. PATIENT: An 18-month-old female child who presented with respiratory distress and failure to thrive. INTERVENTIONS: Diagnostic and therapeutic thoracentesis. Skeletal survey and radionuclide bone scan. Nutritional support. OUTCOME MEASURES: Pleural fluid is characterized as chylous if it contains significant numbers of lymphocytes and lipid. Unexplained fractures of the ribs and long bones in varying stages of healing are considered nonaccidental. Failure to thrive may be considered nonorganic when nutritional support alone results in significant weight gain. RESULTS: Our patient presented with respiratory distress of one-week duration and failure to gain weight during the prior five months. The chest radiograph demonstrated bilateral pleural effusions, which were aspirated. The aspirate contained 1733 cells/mm3 (98% lymphocytes), which were lipid laden. The triglyceride concentration was 806 mg/dl. A skeletal survey demonstrated bilateral first rib, clavicle, and ulnar fractures. A radionuclide bone scan additionally revealed multiple vertebral body fractures. Nutritional support alone resulted in significant weight gain. The patient was reported to local authorities as having been abused. CONCLUSION: Child abuse should be considered as an etiology for cryptogenic chylothorax. Further studies should be undertaken in this circumstance to search for coexisting injuries, which may indicate nonaccidental trauma.

Child Abuse↗