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Biomedical subjects

R Dehne

Publications and source records attributed to R Dehne.

11 recordsLinked to original sources
PubMed2001

Osteotomy in the pediatric foot.

Osteotomies are the mainstays of treatment of foot deformities in patients from age 5 to skeletal maturity. A careful biomechanical assessment allows the clinician to evaluate the deformities in the frontal, sagittal, and transverse planes of the body. It also allows the clinician to relate deformities found at the ankle, hindfoot, forefoot, and midfoot to one another and to formulate a cohesive plan of treatment. Presentations with multiple deformities in different parts of the foot and ankle are common. These deformities are not always bony. A classic example is the gastrocnemius contracture in the symptomatic flatfoot. Procedures should be planned to correct all aspects of the deformity at a single sitting if possible.

Ankle Joint↗
PubMed1998

A boy with a limp.

Explore the source record for details and available documents.

Ascorbic Acid↗
PubMed1991

The limping child.

Evaluation of a limping child requires careful consideration and a basic knowledge of potential problems affecting the child. The most important point is not to miss or delay diagnosis of the septic hip. This is truly an orthopedic emergency. Complaints of knee pain should not throw the physician off the track of a diagnosis of hip disease. It is also important to be aware of how the medical history affects the musculoskeletal system. Many causes of limp are best analyzed by repeat examination and stepwise laboratory and radiographic evaluation. One should realize that a painful limp can be caused by something as mundane as a thorn in the heel or as serious as a tumor of the spine: Be suspicious.

Bone Diseases↗
PubMed1991

Autologous marrow injection as a substitute for operative grafting of tibial nonunions.

Autologous marrow injection was used to stimulate healing in 20 ununited tibial fractures over a five-year period. The technique was employed in conjunction with cast immobilization in ten cases and intramedullary nail fixation in ten cases. Marrow stimulated a callus formation sufficient to unite eight of the ten nonunions immobilized with casts and all ten of the fractures immobilized by intramedullary nails. Bone-marrow injection was as effective as past open autologous grafting but with considerably fewer disadvantages. The technique provides a promptly renewable and reliable source of osteogenic stem cells with numerous advantages compared with standard open-grafting techniques.

Adolescent↗
PubMed1989

Autologous marrow injection for delayed unions of the tibia: a preliminary report.

Over a 3-year period, we have treated 10 delayed unions of the tibia by using percutaneous marrow injection rather than standard operative bone grafting. Nine of the 10 fractures responded by forming callus in the area where the marrow was injected. This relatively simple technique avoided potential problems associated with operative grafting methods that have been standard for at least 50 years. Most importantly, it encourages early treatment of fractures when healing problems are anticipated or are becoming evident.

Adult↗
PubMed1989

Nonunion of the clavicle and thoracic outlet syndrome.

Fifteen adult patients with clavicular nonunions were evaluated over a 10-year period. Fourteen of these patients were treated initially with a "figure-of-eight" clavicle strap. Seven presented with narrowing of the costoclavicular space, and symptoms of intermittent brachial plexus impingement or thoracic outlet syndrome. Two of these resulted from resection of the mid-portion of the clavicle with subsequent impingement from hypertrophy of the lateral stump. Most commonly, hypertrophic nonunion of the clavicle caused the thoracic outlet syndrome, frequently many months after the initial injury. This delayed onset led to diagnostic confusion with other causes of radiating upper extremity pain, including cervical disc disease. Treatment of the adult clavicle fracture is different from that of the child with potential for greater functional impairment. The "figure-of-eight" harness frequently does not provide pain relief or adequate reduction of the fracture. If an acutely displaced fracture in an adult cannot be reduced and held by closed casting technique, open reduction and internal fixation may occasionally be indicated. We have found transcortical fixation by locking Knowles pins to be effective for treating hypertrophic nonunions, as well as for unreducible acute fractures. Atrophic nonunions require plate fixation and autologous grafting. Nonunion of the clavicle has been among the most responsive of nonunions in our experience, since all fractures treated by adequate reduction and fixation healed promptly.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1989

Development of an osteogenic bone-marrow preparation.

The osteogenic effect of bone marrow was tested in rabbits, using chambers that had been implanted in the peritoneal cavity (ectopic site) and in a delayed-union model (orthotopic site). Osteogenesis was accelerated in both sites after concentration of marrow elements by centrifugation, but not after unit gravity sedimentation. Chambers that were implanted with marrow that had been processed by simple and isopyknic centrifugation demonstrated a more pronounced increase in deposition of calcium compared with whole-marrow implants of equal volume (101 compared with 193 per cent). Orthotopic grafting of a rabbit delayed-union model with whole marrow and marrow that had been processed with simple centrifugation significantly increased osteogenesis, as measured biomechanically and biochemically. Significantly improved healing was evident radiographically at five weeks after grafting with bone marrow that had been concentrated by simple centrifugation.

Animals↗
PubMedDate not supplied

Fracture of the superior pelvic quadrant in a child.

We present a case report (with review of the literature) of a 3-year-old child who was struck by an automobile, sustaining a superior quadrant pelvic fracture that involved the sacroiliac joint, the adjacent ilium, and the acetabulum. This was successfully treated by open reduction and fixation with cannulated screws.

Acetabulum↗