[What is your diagnosis? Diaphyseal transverse fracture of the radius and ulna (distal third of the metaphyseal transition). Osteopetrosis].
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The forearm is the most common site for compartment syndrome in the upper extremity. The three compartments of the forearm include the volar (anterior or flexor), the dorsal (posterior or extensor), and the mobile wad. Both-bone forearm fractures and distal radius fractures are common initial injuries in adults that lead to acute forearm compartment syndrome. Supracondylar fractures, especially those with associated vascular injuries, are frequent causes of compartment syndrome in children. The flexor digitorum profundus and flexor pollicis longus are among the most severely affected muscles because of their deep location, adjacent to bone. Initial treatment consists of removal of occlusive dressings or splitting or removal of casts. If symptoms do not resolve rapidly, fasciotomy is indicated. Decompression fasciotomy of the forearm is performed through volar or dorsal approaches. The medial nerve is decompressed throughout its course, including high-risk areas deep to the lacertus fibrosus; between the humeral and ulnar heads of the pronator teres, the proximal arch, and deep fascial surface of the flexor digitorum superficialis; and the carpal tunnel.
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Three different plating techniques were used on experimentally produced dorsally displaced distal radius fractures in cadavers and were tested in 4-point bending: a AO 3.5-mm T plate (group 1), two 2. 0-mm titanium plates 60 degrees to each other (group 2), and the AO pi plate (group 3). A metaphyseal defect was simulated by a dorsally open wedge osteotomy. The tests show that the 2-mm double-plating technique has superior stiffness and statistically equivalent bending and bone gap to failure compared with the AO 3.5-mm T plate or the pi plate when applied to the unstable distal radius fracture model. (J Hand Surg 2000; 25A:29-33.
We retrospectively reviewed 16 children younger than 13 years with 17 fractures of the shafts of the radius or ulna or both who had undergone an open reduction-internal fixation (ORIF). ORIF was performed when a closed reduction was deemed unacceptable in 14 radius fractures and for three unstable open fractures of the radius. The average age was 9.4 +/- 2.3 years (range, 5.0-12.5). Of the 14 fractures with an unacceptable closed reduction, soft-tissue interposition was encountered in seven. Fixation was secured by plates and screws, percutaneous Steinmann pins, or intramedullary Steinmann pins. There were no delayed unions or nonunions, no infections, and no neurovascular injuries. The average follow-up was 12.3 months; all 17 fractures had excellent results (forearm rotation loss of < 10 degrees). Our study indicates that excellent results can be expected with no increased risk of complications if the treating physician elects to proceed with an ORIF in a pediatric forearm fracture with proper indications.
Hydroxyapatite ceramic made of bovine spongiosa was used as structural support material in a prospective study to correct bone defects experienced after reduction in distal radius fractures. The study took place over a 3-year period (1992-1999) and comprised 14 patients. Osseous integration was analyzed via biopsies and magnetic resonance imaging. Long-term follow-up monitoring involving magnetic resonance imaging in 13 of the 14 patients showed fibrovascular growth within incorporated hydroxyapatite material. Osseous integration was demonstrated in magnetic resonance images by gadolinium uptake and by the presence of osteoid layers and endothelialized vessels. Hydroxyapatite ceramic offers a biologically acceptable alternative to autologous bone when augmenting distal radius fracture fixation.
Non-union of the ulnar diaphysis after isolated ulnar shaft fracture is uncommon. Complications due to non-union of the ulna must therefore be very rare. A case of a stress fracture of the radius in a postmenopausal woman following an isolated ulnar shaft fracture and non-union is presented. The mechanism of the stress fracture and propositions for preventing non-union of the ulnar shaft after an isolated fracture in the osteoporotic patient are discussed.
Rupture of the extensor pollicis longus-tendon (EPL) is a frequent complication after distal radius fractures. Other traumatic and non-traumatic reasons for this tendon lesion are known, including a theory about a disorder in the blood supply to the tendon itself. We examined 40 patients after reconstruction of the EPL-tendon in a mean follow-up time of 30 months. All patients were clinically examined and a DASH questionnaire was answered by all patients. The method to reconstruct the EPL-tendon was the transposition of the extensor indicis-tendon. After the operations the thumb was put in a splint for four weeks in a "hitch-hiker's-position". 31 ruptures of the tendon (77.5 %) were a result of trauma. In 20 of them (50 %) a distal radius fracture had occurred. Clinical examination included measurements of the movement of the thumb- and index-finger joints, the grip strength and the maximal span of the hand. Significant differences were not found. The isolated extension of the index finger was possible in all patients. But it was reduced in ten cases which represent 25 %. Our results were evaluated by the Geldmacher score to evaluate the reconstruction of the EPL-tendon. 20 % excellent, 65 % good, 12.5 % fair and 2.5 % poor results were reached. The Geldmacher score was used critically. We suggest its modification for the evaluation of thumb abduction. The DASH score reached a functional value of ten points which represents a very good result. In conclusion the extensor indicis-transposition is a safe method to reconstruct the EPL-tendon. Its substantial advantage is taking a healthy muscle as the motor, thereby avoiding the risk of using a degenerated muscle in late tendon reconstruction. A powerful extension of the index finger will be maintained by physical education. Generally, the loss of the extension of the index finger is negligible. It does not disturb the patients. But it has to be discussed with the patient before the operation.
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Distal fractures of the radius are more common than other types of fracture. The methods of treatment vary greatly, but cure is not always satisfactory. The article subdivides these fractures into flexion and extension types. These two main types are subdivided further. The next chapter deals with conservative repositioning, including the plaster of Paris cast. Surgical treatment is recommended if the fracture cannot be repositioned and if it is unstable. Indication and technical management of percutaneous drill wire fixation are described. Another section of th article deals with plate osteosynthesis in Smith's fractures. Finally, the article goes into the details of stabilization via the external fixator in open fractures, especially fractures involving soft parts.
Morphological changes subsequent to malunion of distal radius fractures involve altered bone density along articular surfaces and wrist ligaments. The inclination of articular surfaces of the scaphoid and lunate in frontal and sagittal planes frequently leads to a dorsal dislocation of the distal fracture fragment. X-ray densitometry of subchondral mineralization shows zones of higher density along the palmar articular border, resulting from excentric load transmission. Typical morphological changes involving wrist ligaments are demonstrated and analyzed.
Mechanical vibration was performed with 5 different frequencies after radius fracture of 76 rabbits. The vibration effects were evaluate by means of X-ray film and bio-mechanical and pathological examinations. Our results suggests: (1) Vibration promotes the fracture healing in rabbits regardless of the frequency. Both bone strength and speed of fracture healing are better than those of the controls. (2) Bone strength is elevated by 20% approximately 30% by the best stimulation of stress. (3) The best frequencies are 25Hz and 50Hz, second best, 12.5 and 100Hz and then, 200Hz.
Four methods of distal radius fracture fixation were tested in this experimental biomechanical study of an unstable Colles' fracture model. Sixty artificial radial bones and seven pairs of cadaveric radii were used. Seven additional pairs of paired cadaveric radial epiphyses were used in separate perforation and cut-out tests. Tests with the artificial bones showed that the rigidity of the four tested fixation methods was comparable, except for proximal intramedullary pinning. The rigidity of the NODE fixation in the cadaveric radii was greater than that of transfragmental pinning. The load at failure was significantly greater for the NODE system than for the Kirschner wire models. Rigidity and failure loads showed a positive correlation with bone mineral density. The current study indicates the NODE system was the strongest of the fixation methods.
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Conservative treatment of fractures of the distal radius often results in malunion. The reasons are discussed. The method of the percutaneous Kirschner wire transfixation for stabilization of the fracture is described. We have seen good results with this method and employ it because of its easy performance and safety. 32 patients with different kind of fractures of the distal radius were treated thus with satisfactory results. Advantages and disadvantages of the Kirschner-wire method are discussed.
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