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At least 127 records · Page 7Linked to original sources
PubMed1984

Retrospective analysis of 29 fractures of the olecranon process of the equine ulna.

Twenty-nine fractures of the olecranon process of the ulna in horses treated at The Ohio State University College of Veterinary Medicine from 1973 through 1983 were evaluated. The objectives of the study were to determine the prognosis for various configurations of fractures of the olecranon process of the ulna, to determine what preoperative factors influenced the prognosis, and to evaluate the efficacy of the treatment methods used. The fractures were placed in one of 4 categories on the basis of severity of the injury: type-1 fractures involved the physeal plate; type-2 fractures involved the olecranon at the level of the anconeal notch (narrowest cross-sectional area of the ulna); type-3 fractures involved the proximal portion of the olecranon without involving the elbow joint; and type-4 fractures were severely comminuted fractures. Three modes of treatment used were: (1) open reduction and internal fixation, using a tension band plate, (2) elbow to ground splinting, with stall rest, and (3) stall rest alone. Internal fixation with a tension band plate was 68% successful. Of those horses in which repair was considered successful, 84% returned to excellent function. Elbow to ground splinting with stall rest was used successfully for nonarticular and nondisplaced fractures in 2 horses. Stall rest alone resulted in 28% "pasture sound" horses, with none of the 7 horses so treated returning to athletic performance. On the basis of this study, the following conclusions were derived. (1) Nonarticular/nondisplaced fractures are candidates for nonsurgical treatment, using full-limb splinting, stall rest, and periodic reevaluation.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1982

Chronic hypertrophy of the ulna in the professional rodeo cowboy.

Radiographs were taken of the forearm of 56 rodeo contestants who performed regularly in active competition. All of the professional bareback riders revealed a significant hypertrophy in the ulna. This hypertrophy is considered to be a chronic circumferential periostitis, secondary to contact of the subcutaneous ulna with the anterior iliac crest, and to the heavily resined chaps worn by the rodeo cowboy. There is no significant treatment with exception of padding, etc. The clinical complaints of "soreness" disappear with the cessation of the contact between the subcutaneous ulna and iliac crest.

Athletic Injuries↗
PubMed1995

Anatomic considerations for anterior approaches to the ulna.

Anterior approaches to the ulna were studied on 22 cadaveric forearms as alternative approaches to the ulnar shaft. An anterior approach is indicated when there is extensive posterior scar tissue, or extensive soft tissue loss in the posterior forearm as in some fresh fractures, or when a tumor is resected from the anterior ulna. This study describes and compares the traditional anteromedial approach to the ulna with a proposed anterior approach, and defines the exact relations of the different anatomic structures seen in each approach.

Adult↗
PubMedDate not supplied

Pseudo-Volkmann's contracture due to tethering of flexor digitorum profundus to fractures of the ulna in children.

We studied seven children with the unusual complication of pseudo-Volkmann's contracture due to tethering of the flexor digitorum profundus to fractures of the ulna. It was detected 2 days to 16 years after closed reductions of fractures of the shafts of the radius and ulna. The children did not have nerve palsies or undue pain after the reductions. Normal length, excursion, and function of the flexor digitorum profundus was restored by untethering the muscle and its tendons from the ulnar fracture by early manipulation or by late localized myotenolysis. We recommend that the passive range of motion of all fingers be routinely checked immediately after closed reductions of fractures of the radius and ulna. If muscle tethering is detected, the fracture is remanipulated to release the muscle. If the muscle is still tethered, then surgical release, through a small incision, is required.

Adolescent↗
PubMedDate not supplied

Bilateral traumatic dislocation of the distal radioulnar joint, ulna dorsal: case report and review of the literature.

Bilateral dislocation of the distal radioulnar joint seems not to have been reported in the literature. This is a report of a 22-year-old man successfully treated with closed reduction and immobilization in long arm casts. Limited forearm rotation and wrist pain after a twisting injury are typical findings. In ulna dorsal dislocation the patient's forearm is locked in pronation. In ulna volar dislocation the wrist appears narrow and the forearm is locked in supination. The mechanism of injury for dorsal dislocations is hyperpronation; for volar dislocations it is hypersupination. Dislocation of the distal radioulnar joint injures the triangular disk and/or fractures the ulnar styloid. Suspicion is important in making the diagnosis. Fifty per cent of unilateral cases reported in the literature were missed initially or were diagnosed late. The acute case is easily treated by closed reduction under local anesthesia and immobilization in a long arm cast. Treatment of the chronic dislocation includes various soft tissue reconstructions or resection of the distal ulna depending on the degree of arthrosis.

Adult↗
PubMed1999

Ulnar variance and skeletal maturity of radius and ulna in female gymnasts.

UNLABELLED: It is has been suggested that repetitive loading on the distal end of the radius in elite gymnasts may lead to epiphyseal changes, a premature closure (union) of the radius growth plate, and ulnar overgrowth. PURPOSE: It is hypothesized that ulnar overgrowth in female gymnasts is associated with advanced maturity status and early onset of epiphyseal closure of the radius, and later maturity status and later onset of epiphyseal closure of the ulnar. METHODS: Posterior-anterior radiographs of 201 female gymnasts, participants of the 1987 World Championships Artistic Gymnastics, were used to measure ulnar overgrowth, to determine skeletal maturation of the hand and wrist with the Tanner-Whitehouse technique, and to determine the maturity status of the radius and ulna separately, particularly with regard to the onset of epiphyseal closure. To test the hypothesis, extreme quintiles for ulnar overgrowth were contrasted for skeletal maturation of the hand and wrist and for maturity stages of the radius and ulna as defined by the Tanner-Whitehouse criteria. RESULTS: Female gymnasts who demonstrate ulnar overgrowth are skeletally more advanced in maturity status of the entire hand-wrist compared with gymnasts who did not show ulnar overgrowth. There were, however, no differences between gymnasts in the extreme quintiles of ulnar overgrowth in the maturation of the radius, although gymnasts with ulnar overgrowth show more advanced maturity status of the ulna. CONCLUSIONS: Ulnar overgrowth is thus not apparently associated with advanced maturity of the distal radial epiphysis as defined in protocols for assessing skeletal maturity and does not apparently lead to premature epiphyseal closure of the distal radius.

Adolescent↗
PubMed1984

The effects of antibiotic-supplemented bone allografts on contaminated, partially avulsive fractures of the canine ulna.

The use of antibiotic-supplemented bone allograft as a material for placement in contaminated fractures of the dog ulna was investigated. Demineralized, freeze-dried bone allografts mixed with antibiotics and gelatin were placed in five fractures contaminated with Staphylococcus aureus (Washington Hospital strain) and Pseudomonas aeruginosa (PA 220). The results of treatment with antibiotic-supplemented bone allografts were compared with the results of conventional treatment in five additional experimental animals in which fractures contaminated with S. aureus and P. aeruginosa were created. The five fractures treated by conventional methods developed acute osteomyelitis and nonunion, whereas the ASBA-treated fractures resulted in bone union without infection. ASBA-treated fractures were stable and had 89% of the shearing strength of the non-fractured, contralateral ulnae five months after treatment.

Animals↗
PubMed1998

Fragmented medial coronoid process of the ulna in the dog.

Fragmented medial coronoid process of the ulna is an important cause of elbow dysplasia in the dog. Etiologic factors that have been identified include osteochondrosis, ulnar trochlear notch incongruity or dysplasia, and asynchronous growth of the radius and ulna. Treatment options that are discussed are conservative medical management, surgical removal of the coronoid fragments, and ulnar osteotomy or ostectomy. Prognosis is variable and depends on etiologic factors and response to therapy.

Animals↗
PubMed1995

Lasso stabilization of the distal ulna after tumor resection: a report of two cases.

Two patients with complicated giant cell tumors of the distal ulna were treated by resection of 7.5 and 5.5 cm of the ulna, respectively. The proximal ulnar stump was stabilized with a lasso tendon graft, which allowed the patients to return to presurgery activities. The technique described is a modification of a tendon loop reconstruction used by Bunnell.

Adult↗
PubMed1999

[Reconstruction of the proximal quarter of the ulna after post-traumatic destruction. 3 case reports].

Serious injuries of the elbow with of bone loss of the proximal ulna or of the two bones of the forearm may result in a loss of function in flexion-extension and pronation supination with painful instability of the elbow. The treatment of these functional sequelae is difficult because it must reestablish the mobility and the stability of the elbow. We report three cases of post-traumatic loss of the proximal quarter of the ulna. In two cases, the radius was intact and we transferred the proximal radius according to Young's method modified by Piollet. In the third case, the loss of the proximal extremity of the two bones of the forearm was treated with the transfer of the proximal extremity of the fibula. By means of these techniques, our three patients had very satisfying functional results as evaluated at 18 years, 18 months and 17 years follow-up respectively.

Adult↗
PubMed2002

[Pseudarthrosis of the ulna in a patient with neurofibromatosis].

A case of pseudoarthrosis and partial resorption of the ulna in a 12-year-old girl with neurofibromatosis is described. Neurofibromatosis is a common neurocutaneous disease with characteristic osseous lesions. The pseudoarthrosis in this case developed after fracture. The bone most commonly affected is the tibia and involvement of the ulna has been reported in only a few cases. The possible cause of pseudoarthrosis, the radiographic changes, and the treatment are discussed.

Child↗
PubMed1996

Primary malignant melanoma (clear cell sarcoma) of bone: report of a case arising in the ulna.

BACKGROUND: To the authors' knowledge, there has been no previous report of primary malignant melanoma of bone. METHODS: A 33-year-old woman presented with a tumorous lesion in the olecranon of the right ulna. The histologic diagnosis was malignant melanoma with close similarity to clear cell sarcoma. To exclude the possibility of malignant melanoma metastatic to the bone, clinical investigations including gallium 67-citrate scintigraphy, brain, chest, and abdominal computed tomography, and upper and lower gastrointestinal endoscopic examinations were performed. Conventional histopathologic, immunohistochemical, and electron microscopic studies were also performed. RESULTS: Clinical investigations showed no lesion suggestive of a primary melanoma other than that in the right ulna. Histologically, the tumor was comprised of polygonal or fusiform cells with clear or granular cytoplasm and vesicular nuclei containing one or two prominent nucleoli. The features were similar to those of clear cell sarcoma (malignant melanoma of soft parts). Fontana preparations and immunohistochemical staining for S-100 protein and HMB-45 (melanoma specific antigen) also revealed that the tumor cells had the characteristics of malignant melanoma. The patient has remained alive and well for more than 5 years after the initial treatment. CONCLUSIONS: The clinicopathologic findings in this case strongly suggested that the lesion was a primary malignant melanoma of bone. Therefore, this is the first report to indicate that malignant melanoma and related diseases can occur even in bone tissue.

Adult↗
PubMed2004

Interventions for isolated diaphyseal fractures of the ulna in adults.

BACKGROUND: Isolated fractures of the shaft of the ulna, which are often sustained when the forearm is raised to shield against a blow, are generally treated on an out-patient basis. OBJECTIVES: To assess the effects of various forms of treatment for isolated fractures of the ulnar shaft in adults. SEARCH STRATEGY: We searched the Cochrane Musculoskeletal Injuries Group specialised register (November 2003), the Cochrane Central Register of Controlled Trials (The Cochrane Library Issue 4, 2003), MEDLINE (1966 to November week 2 2003), EMBASE (1981 to 2003 week 51) and CINAHL (1982 to December week 2 2003), Current Controlled Trials (accessed November 2003), the UK National Research Register (up to Issue 4, 2003 ), various conference proceedings and bibliographies of relevant articles. Date of the most recent search: December 2003. SELECTION CRITERIA: Randomised or quasi-randomised trials of conservative and surgical treatment of isolated fractures of the ulnar shaft in adults. Excluded were fractures of the proximal ulna and Monteggia fracture dislocations. DATA COLLECTION AND ANALYSIS: Independent quality assessment and data extraction were performed by the reviewers. Requests for more information were sent to trialists. Given the limited and generally poor quality evidence available, quantitative analysis was kept to a minimum. MAIN RESULTS: One new trial comparing two types of plates used for the surgical fixation of these fractures was included in the fifth update of this review. Thus there are now three trials, involving a total of 135 patients. All three trials were methodologically flawed, particularly the two trials of conservative treatment. One of these compared short arm pre-fabricated functional braces with long arm plaster casts. There was no statistically significant difference in the time it took for fracture union. Patient satisfaction and return to work were better in the brace group. The other, a quasi-randomised trial, compared Ace Wrap elastic bandage, short arm plaster cast and long arm plaster cast. The large loss to follow-up in this trial makes any data analysis tentative. However the need for replacement of the Ace wrap by other methods due to pain does indicate the potential for a serious problem with this intervention. There were no statistically significant differences in anatomical or functional outcomes nor complications between the two plate groups in the surgical trial. REVIEWERS' CONCLUSIONS: There is insufficient evidence from randomised trials to determine which method of treatment is the most appropriate for isolated fractures of the ulnar shaft in adults. There is a need to establish the incidence of this injury and the outcome and associated costs of the various forms of treatment. Well designed randomised trials of current forms of conservative treatment are recommended.

Adult↗
PubMed2002

Absence of thumbs, A/hypoplasia of radius, hypoplasia of ulnae, retarded bone age, short stature, microcephaly, hypoplastic genitalia, and mental retardation.

The previously unreported combination of bilateral absence of thumbs, aplasia of ulna at one and hypoplasia of ulna on the other side, retarded bone age, short stature, microcephaly, micropenis, cryptorchidism, and mental retardation is described in a 5-year-old boy. Having excluded major differential diagnoses, e.g. Fanconi anemia, RAPADILINO syndrome and VACTERL association, we hypothesize that this boy represents a new multiple congenital anomaly/mental retardation (MCA/MR) syndrome.

Abnormalities, Multiple↗
PubMed2003

Ontogenetic and regional morphologic variations in the turkey ulna diaphysis: implications for functional adaptation of cortical bone.

This study examines relationships between bone morphology and mechanically mediated strain/fluid-flow patterns in an avian species. Using mid-diaphyseal transverse sections of domestic turkey ulnae (from 11 subadults and 11 adults), we quantified developmental changes in predominant collagen fiber orientation (CFO), mineral content (%ash), and microstructure in cortical octants or quadrants (i.e., %ash). Geometric parameters were examined using whole mid-diaphyseal cross-sections. The ulna undergoes habitual bending and torsion, and demonstrates nonuniform matrix fluid-flow patterns, and high circumferential strain gradients along the neutral axis (cranial-caudal) region at mid-diaphysis. The current results showed significant porosity differences: 1) greater osteocyte lacuna densities (N.Lac/Ar) (i.e., "non-vascular porosity") in the caudal and cranial cortices in both groups, 2) greater N.Lac/Ar in the pericortex vs. endocortex in mature bones, and 3) greater nonlacunar porosity (i.e., "vascular porosity") in the endocortex vs. pericortex in mature bones. Vascular and nonvascular porosities were not correlated. There were no secondary osteons in subadults. In adults, the highest secondary osteon population densities and lowest %ash occurred in the ventral-caudal, caudal, and cranial cortices, where shear strains, circumferential strain gradients, and fluid displacements are highest. Changes in thickness of the caudal cortex explained the largest proportion of the age-related increase in cranial-caudal breadth; the thickness of other cortices (dorsal, ventral, and cranial) exhibited smaller changes. Only subadult bones exhibited CFO patterns corresponding to habitual tension (ventral) and compression (dorsal). These CFO variations may be adaptations for differential mechanical requirements in "strain-mode-specific" loading. The more uniform oblique-to-transverse CFO patterns in adult bones may represent adaptations for shear strains produced by torsional loading, which is presumably more prevalent in adults. The micro- and ultrastructural heterogeneities may influence strain and fluid-flow dynamics, which are considered proximate signals in bone adaptation.

Adaptation, Physiological↗
PubMed1996

Mechanical loading and sex hormone interactions in organ cultures of rat ulna.

The separate and combined effects of loading and 17 beta-estradiol (E2) or 5 alpha-dihydrotestosterone (DHT) on [3H]thymidine and [3H]proline incorporation were investigated in cultured ulna shafts from male and female rats. Ulnae were cultured and loaded to produce physiological strains in the presence or absence of 10(-8) M E2 or DHT. Loading engendered similar increases in incorporation of [3H]thymidine and [3H]proline in male and female bones. E2 engendered greater increases in incorporation in females than in males, and DHT greater increases in males than in females. In males E2 with loading produced increases in both [3H]thymidine and [3H]proline incorporation, which approximated to the arithmetic addition of the increases due to E2 and loading separately. In females E2 with loading produced increases greater than those in males, and substantially greater than the addition of the effects of E2 and loading separately. Loading with DHT in males also showed additional [3H]thymidine and [3H]proline incorporation. In females there was additional incorporation of [3H]proline, but not [3H]thymidine. The location of incorporation of [3H]thymidine and [3H] proline was consistent with their level of incorporation reflecting periosteal osteogenesis, in which case the early osteogenic effects of sex hormones are gender-specific when acting alone and in combination with loading. In males the effects of estrogen and testosterone add to, but do not enhance, the osteogenic responses to loading. In females testosterone with loading produces an additional effect on [3H]proline incorporation but no greater effect than loading alone on that of [3H]thymidine. In contrast, estrogen and loading together produce a greater effect than the sum of the two influences separately. Because premenopausal bone mass will have been achieved under the influence of loading and estrogen acting together, these findings suggest that the bone loss which follows estrogen withdrawal may result, at least in part, from reduction in the effectiveness of the loading-related stimulus on bone cell activity. This stimulus is normally responsible for maintaining bone mass and architecture.

Animals↗
PubMed2006

Allogenic peripheral blood derived mesenchymal stem cells (MSCs) enhance bone regeneration in rabbit ulna critical-sized bone defect model.

Mesenchymal stem cells (MSCs) were demonstrated to exist within peripheral blood (PB) of several mammalian species including human, guinea pig, mice, rat, and rabbit. Whether or not the PB derived MSCs (PBMSCs) could enhance the regeneration of large bone defects have not been reported. In this study, rabbit MSCs were obtained from mononuclear cells (MNCs) cultures of both the PB and bone marrow (BM) origin. The number of PBMSCs was relatively lower, with the colony forming efficiency (CFE) ranging from 1.2 to 13 per million MNCs. Under specific inductive conditions, PBMSCs differentiated into osteoblasts, chondrocytes, and adipocytes, showing multidifferentiation ability similar to BMMSCs. Bilateral 20 mm critical-sized bone defects were created in the ulnae of 12 6-month-old New Zealand white rabbits. The defects were treated with allogenic PBMSCs/Skelite (porous calcium phosphate resorbable substitute), BMMSCs/Skelite, PBMNCs/Skelite, Skelite alone, and left empty for 12 weeks. Bone regeneration was evaluated by serial radiography, peripheral quantitative computed tomography (pQCT), and histological examinations. The X-ray scores and the pQCT total bone mineral density in the PBMSCs/Skelite and BMMSCs/Skelite treated groups were significantly greater than those of the PBMNCs/Skelite and Skelite alone groups ( p < 0.05), respectively. Histologically, newly formed bone was evident in the PBMSCs/Skelite and BMMSCs/Skelite treated groups. The findings demonstrated that the rabbit PBMSCs possessed multidifferentiation potential comparable with BMMSCs, allogenic PBMSCs seeded onto porous calcium phosphate resorbable substitutes enhanced bone regeneration in the rabbit ulna critical-sized bone defect model, suggesting allogenic PBMSCs may be a new source of circulating osteogenic stem cells for bone regeneration and tissue engineering.

Animals↗