[Posttraumatic AV fistula in the upper arm region following a foreign body injury. Sonographic diagnosis - a case report]. / Sonographischer Nachweis einer posttraumatischen AV-Fistel am Oberarm nach Fremdkörpereinsprengung.

This paper reports on the sonographic localisation of a metallic foreign body in the upper arm region and its topographic anatomic position as well as the sonographic diagnosis of an AV fistula due to a lesion of the brachial blood vessels. Ultrasonography is the method of choice for the evaluation and diagnosis of foreign body injuries and possible subsequent complications.

[Ultrasound diagnosis in trauma: elbow and hand]. / Sonographie beim Trauma: Ellenbogen und Hand.

Ultrasonography with high-frequency transducers nowadays plays an important role in diagnosing post-traumatic complaints of the elbow and hand tissue in children as well as in adults. We see it as an addition to clinical examination, standard X-ray, and other radiological methods. As a noninvasive procedure we can investigate post-traumatic changes and postoperative pain, detect foreign bodies, and also use it for postoperative metal removal. The possibility of imaging cartilage structures with ultrasound also enables us to diagnose post-traumatic injuries in children's elbows such as supracondylar fractures, epiphysiolyses, and fractures of the epicondyles.

HAGL lesion occurring after successful arthroscopic Bankart repair.

Recurrent traumatic anterior shoulder instability following surgical repair may be associated with implant failure and an array of capsulolabral pathology including separation of the labrum (Bankart lesion), humeral avulsion of the glenohumeral ligaments (HAGL lesion), and capsular rupture. We detail a previously unreported case of a HAGL lesion occurring in a shoulder with an intact arthrosopic Bankart repair following an additional traumatic event. Anatomic repair of this subsequent injury resulted in an excellent outcome. The patient returned to his high-demand ski racing activities without any shoulder limitation.

[Ultrasound anatomy of the sciatic nerve of the thigh]. / Die Sonoanatomie des Nervus ischiadicus am Oberschenkel.

Ultrasound examinations of the sciatic nerve were performed using high-resolution transducers (7.5, 10 to 20 MHz) both in anatomical specimens and in healthy volunteers. The ultrasonographic anatomy (sono-anatomy) of the nerve, its course along the thigh and its echogenicity in comparison with muscles, tendons and adipose tissue were investigated in 10 isolated muscle/nerve preparations. In addition, the influence of the angle of the applied transducer on the various different tissues was evaluated. In the clinical part of the study, the sciatic nerve was identified ultrasonographically in both thighs of 50 sex-matched healthy volunteers aged between 2 and 76 years. The normal sciatic nerve presents as a tubular echogenic structure with parallel linear internal echoes in the longitudinal section, and as a punctiform moderately echoic structure in cross-section, with the perineurium producing bright boundary echoes. Varying the insonating angle of the transducer reduced echogenicity, but to a smaller degree than in muscles and tendons. Unequivocal identified of the sciatic nerve from the level of the gluteal fold to its bifurcation in the distal thigh was possible in all but one case. We conclude that the course of the sciatic nerve along the thigh can be reliably identified and imaged with high-resolution ultrasound.

Ultrasonographic localization of a displaced screw in the carpal canal. A case report.

We present a case of a 65-year-old patient with a surgically treated distal radius fracture. At 5-month follow-up, conventional radiography revealed breakage of the plate and a screw displaced into the volar soft tissue. Preoperative ultrasonography including dynamic assessment of the tendons showed the screw intratendinously as a hyperechogenic structure with repetitive echoes. This unusual localization was proven by surgery. Dynamic ultrasonography played an important diagnostic role in the localization of the loosened and displaced osteosynthetic material.

Detection of pneumoperitoneum by ultrasound examination: an experimental and clinical study.

PURPOSE OF THE STUDY: The aim of the study is to show the value and reliability of ultrasound examination in detecting free intraabdominal air after blunt abdominal trauma. METHODS: The experimental part of this study includes the evaluation of the sonographic morphology of air within liquid and solid tissues. Subsequently air was injected into the abdominal cavities of 10 cadavers and sonography utilized for localization and assessment of the minimal detectable air volume. The clinical part of the study reports on the sonographic detection of hollow viscus perforation in 10 patients, who were admitted to our institution because of acute abdominal problems. RESULTS: Sonography is a reliable method for the diagnosis of free intraabdominal air. Best position for ultrasound examination of the abdomen is supine with the thorax slightly elevated (10-20 degrees). The optimal probe position is in the right paramedian epigastric area in the longitudinal direction. In all the 10 patients we were able to diagnose pneumoperitoneum preoperatively by ultrasound assessment.

Scope and limitations of ultrasonography in the documentation of fractures--an experimental study.

Sonographic studies were performed on cadaveric bones placed in a water bath, using 7.5-MHz linear-array transducers and 3.5-MHz sector transducers. Depending on its size, the defect was revealed as an interruption of the cortical reflection of echo or a dorsal band of echoes confined to the region of the fracture. It was interesting to note that fractures and bony defects are not visualized when the transducer is placed parallel to the fracture line or the zone of bony impaction. A further remarkable aspect was the numerous artefacts adjacent to each other at several fracture margins. It may be concluded that in an experimental setting and under standardized conditions, high-resolution transducers permit the examiner to detect cortical discontinuities of 1 mm or more.

Denervation of the radiocarpal joint. A follow-up study in 22 patients.

Denervation surgery has been a mainstay of our management of chronic pain in the wrist. If there is useful movement at the wrist we prefer denervation to arthrodesis. We have reviewed 22 patients at a mean of 50 months after such denervation surgery at the wrist. This was the only treatment in 16 patients; the other six also had other treatments. Pain was reduced in 16 patients, and 17 were satisfied or improved. None of the patients wished to have a supplementary arthrodesis. We stress the importance of preoperative blockade tests and of a very detailed knowledge of the local anatomy.

[Value of ultrasound of the support and locomotor system--with special reference to radiation exposure and cost reduction]. / Stellenwert der Sonographie am Stütz- und Bewegungsapparat--unter besonderer Berücksichtigung von Strahlenbelastung und Kostenreduktion.

In recent years, ultrasonic assessment of the locomotory system has become established both as a screening method in patients with chronic disorders and for evaluating acute injuries. Thanks to technical improvements to the equipment (use of high-frequency probes up to 20 MHz), ever smaller structures can be visualized. Ultrasonography can be carried out immediately following the clinical- and possibly radiological-assessment, by one and the same investigator, and requires little extra time. A bilateral examination in particular permits good evaluation of the extent of an injury and, with appropriate experience and good-quality equipment, an accurate assessment of the anatomical topography. Ultrasonography should now be used as the primary imaging method in the diagnosis of injuries to the following parts of the locomotory system, thus helping to minimize the number of expensive, and more invasive, diagnostic procedures: muscles and tendons, peri-articular soft tissue (in particular shoulder, knee and elbow joints), detection of intra-articular effusions, collections of fluid and, where applicable, ultrasonically guided puncture. In numerous other problems, too (postoperative complications, foreign bodies, fractures, osteomyelitis, soft tissue inflammation, etc.), ultrasound can deliver the first information. In this way, expensive diagnostic techniques can be reserved for special cases only, thus reducing costs. Furthermore, used as an adjunctive method, ultrasonography can reduce the number of diagnostic and follow-up X-rays in the case of injuries to the AC joint, shoulder dislocations, Hill-Sachs lesions, fractures in children, and for the detection of foreign bodies, again reducing radiation exposure and overall costs.

[Value of ultrasound imaging of the Achilles tendon in traumatology]. / Wertigkeit der Sonographie der Achillessehne in der Traumatologie.

METHOD: In an experimental study on ten isolated human cadaver tendons, the ultrasound anatomy and the reproducibility of artefacts was determined using 10- and 13-MHz probes. With these in vitro data, the form and diameter of a non-injured tendon were documented in a series of 30 patients between 3 and 60 years old. In a second series of 32 patients with acute, traumatic ruptures of the Achilles tendon and 40 patients with chronic disorders, we distinguished the pathological anatomy. RESULTS: Injuries to a tendon with chronic disorders, reruptures and complications in the postoperative period after tendon repair can be made more difficult by calcification, scars, oedema, haematoma and suture materials. It is necessary to check the changing ultrasound patterns owing to an haematoma or oedema with tendon carpulence, the missing linear signals in a fresh rupture and the different signals after operative or nonoperative treatment. CONCLUSION: Using high-frequency probes with 10 or more MHz, it is possible to examine even the insertion area of the tendon or the pathology of a subachilleal bursa by tilting the probe. The dynamic examination and the comparison with the contralateral side in two planes should be included in a standardized examination procedure and are of great importance in some cases of fresh tendon ruptures. Knowledge of the physical principles and the possibility of misleading artefacts is crucial.

[Ultrasound imaging of foreign bodies--an experimental study]. / Sonograpische Darstellung von Fremdkörpern--eine experimentelle Studie.

In an experimental study, the US pattern of foreign materials such as are often found in wounds, was investigated. The exploration was carried out with the aid of high-resolution, mechanical US probes (10-12 MHz) used to examine foreign bodies placed in a gelatine bath and in the shoulder of a pig. The study showed that all foreign bodies that measured at least 1-2 mm in diameter were reliably detected. The intensity of the interface echoes was identical with all the materials employed, irrespective of the nature of the surface. However, the artefacts caused by the foreign bodies used revealed considerable differences. Complete acoustic shadow, acoustic attenuation, reverberation echoes and even "comet-tail" artefacts were observed. In clinical practice, familiarity with the artefacts that may be expected during sonographic exploration and localization of foreign bodies in wounds would seem to make good sense.

[Value of ultrasound in diagnosis of post-traumatic heterotopic ossifications]. / Stellenwert der Sonographie in der Diagnostik posttraumatischer heterotoper Ossifikationen.

Heterotopic ossification is a non-neoplastic deposit of bone within soft tissue (myositis ossificans). The most common localized form is post-traumatic myositis ossificans. The ultrasonographic appearance of heterotopic ossification is characterized by highly echogenic areas with attenuation or complete disappearance of the acoustic signal distal to these areas. The size and extent of para-articular ossifications can also be evaluated, and the choice of the surgical approach is facilitated and damage to soft tissue minimized by the ultrasonographic examination.

[Ultrasound imaging and localization of metal implants. A clinical study]. / Sonographische Darstellung und Lokalisation von Metallimplantaten. Eine klinische Studie.

In a first experimental study we investigated the visualisation of metal implants in reference to dimension, shape, material (titanium, steel, biodegradable screws) and surface structures and an eventual change of the echo pattern in correlation to the surrounding structures, the vicinity to bone and the change of the sound angle. For this purpose ultrasound investigation was performed in artificial and cadaver bones and in cadaver limbs after implantation of screws, plates, K-wires and cerclage wires. We found that metal implants of a certain dimension can be localised by typical artefacts (resonance artefact, comet tile artefact). In the following clinical study we investigated the value of ultrasound in finding and localisation of implants after osteosynthesis. In patients with 25 locking femur nailing, 30 locking tibia nailing, 30 osteosynthesis done by screws and plating, metal was easily localised by typical artefacts. Ultrasound examination gave the possibility to define the number of screws, the localisation to surrounding tissue, loosening of screws and eventual as sociated inflammatory tissue swelling (bursitis, tendovaginitis).

[Ultrasound imaging of osteosynthesis materials in traumatology--an experimental study]. / Sonographische Darstellung von Osteosynthesematerial in der Traumatologie--eine experimentelle Studie.

The aim of the present study was to establish the typical ultrasound (US) patterns of metal implants used for internal fracture fixation, and consequently to use US for the identification and localisation of such implants. We investigated both the visualization of the implants in term of size and shape, material (titanium, steel, biodegradable screws) and surface structures, and possible changes in the echo pattern in relationship to surrounding structures (muscles, body fluid), proximity to bone, and changes in the angle of insonation. For this purpose ultrasonography was performed on artificial and isolated cadaver bones in a water bath, as well as on cadaver limbs following prior implantation of screws, plates, K-wires and cerclage wires. We found that, from a certain size upwards, metal implants can be easily localised on the basis of typical artefacts (resonance artefact, comet-tail artefact). US is thus most suitable for localisation of metal implants. The spatial and anatomical relationship to bony structures, joints, tendons, muscles and blood vessels can be determined with a high degree of accuracy.