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Biomedical subjects

G Dahmen

Publications and source records attributed to G Dahmen.

At least 37 records · Page 2Linked to original sources
PubMed1982

[Free bodies in the knee joint. Etiology, clinical course and therapeutic plan].

Free bodies are supposed to induce degenerative joint disease. The etiological mechanism, as far as known, of the most important and frequent diseases with corpora libera osteochondrosis dissecans, osteochondral and chondral fracture, chondromatosis and osteoarthrosis are discussed. The diagnostic and therapeutic methods are described. The need for surgical therapy is obvious in cases with chronical synovial irritation. The opportunity to reimplant a loose body into the joint surface should be taken. The technique and the results of sticking the fragments to reconstruct the joint surface are demonstrated.

Adolescent↗
PubMed1982

[Correlation between compression characteristics and CAT densitometry values of vertebral bodies (author's transl)].

The compression characteristics of 25 fresh cadaveric vertebrae of different height had been analysed in static compression tests and related to CAT densitometry values. A relationship between fracture load and CAT densitometry values of the vertebral body (spongiosa and corticalis) had been found, which can be described as a logarithmical function (r2 = 0.91). Separated CAT measurements of spongiosa also showed a logarithmical function (r2 = 0.89). Consequently, the thin corticalis of vertebral waist is of subordinate importance in correlation to fracture load. An analogously explored average CAT densitometry value showed no definite dependence on corticalis capacity. The graphic description of analysed spongiosa areas in absorption profile (CAT histogram) almost resulted in a Gauss distribution.

Adult↗
PubMed1982

[Long-term experience with the myoelectrical arm prosthesis for blind hand-amputees].

In the framework of a personal investigation seven blind hand amputees (survivors of world war II, and of the Portuguese colonial war) had been interviewed to study the influence of myoelectric prosthetic fitting on their social and vocational rehabilitation. Five of them use their prostheses from eight to fifteen hours a day, primarily in the office; at home they prefer their Krukenberg stump. For the clients' self-esteem, the cosmetic factors seems to be decisive. Yet all of the clients engaged in (desk) work emphasize that they could do their jobs without using the myoelectric prostheses, without however wishing to be provided with some other type of prosthesis.

Adult↗
PubMed1980

[Postoperative performance of the proximal femoral epiphysis after surgical treatment in epiphyseolysis capitis femoris (author's transl)].

The article reports on the performance of the proximal femoral epiphysis after isolated screw fixation, Imhäuser-Weber's operation and open repositioning with subcapital osteotomy. The indication for the choice of the operation is explained. Results of the three operative treatment methods are discussed in respect of postoperative mobility, osseous fusion period and complications. Detailed attention is paid to the localisation of the first signs of ossification.

Bone Screws↗
PubMed1980

[Etiology of femur head necrosis and coxarthrosis (demonstrated by 166 surgical cases at the Eppendorf University Orthopedic Clinic)].

Surgical therapy had become necessary in 166 patients who had been referred to hospital with the diagnosis of necrosis of the femoral head or osteoarthrosis of hip. In these patients, the osteoarthroses of hip and necroses of the femoral head were observed separately. The secondary osteoarthroses based on a necrosis of the femoral head were classified among the latter group. We also differentiated between the following age groups: 0-20 years, 20-50 years, 50-70 years and over 70 years; the form of therapy also served as a means of distinction.

Adolescent↗
PubMed1979

[Delayed complications after dislocations and fractures in the pelvic region (author's transl)].

In the case of surgically dressed necroses of the hip condyle and coxarthroses a condition was found after fracture of the pelvis or after dislocation of the hip joint in 7.2% of the cases. In 13.2% of the cases a trauma was found anamnestically. It was subdivided into fractures of the acetabulum, fractures of the pelvic girdle, dislocations, and fractures of the pelvic brim on the basis of the system of Judet and Engler as well as Feldkamp. Fractures of the pelvic brim through muscular traction, traction of the ligament, and direct trauma were discussed. The most frequent delayed consequences arising after dislocations of the hip joint and fractures of the acetabulum are: necroses of the head of the femur, coxarthroses, pseudarthroses, and myositis ossificans. The pathogenesis of the delayed injuries resulted from: capsular and vascular lesions, damage to cartilage with fractures in the spongiosa region, incongruence of the surface of the joint, insufficiency of the static structure of the pelvic ring, deposit of calcium salt outside the bone. In some cases the progress of the necrosis could be arrested by means of osteotomy and spongiosa filling. The rate of necrosis increases in proportion to the period between the time of occurrence of the accident and reposition (limit of 6 h). Even though about half the pelvic girdle fractures show good results with conservative treatment, in the case of fractures of the acetabulum a reconstruction as far as possible continuous and without stages is to be aimed at. In many cases the development of a myositis ossificans cannot be prevented.

Adolescent↗
PubMed1979

[Comments on the lateral load capacity of the phalangeal joints (author's transl)].

The article compares the load capacity of the collateral ligaments of the metacarpo-phalangeal and interphalangeal joints exposed to a laterally applied force. The tests were performed in vivo with 50 each female and male volunteers. It was found that the average load capacity of the metacarpo-phalangeal and interphalangeal joints in women was 5.8 kp and in men 12.3 kp. Furthermore, the bones of the long fingers with the preserved joint capsules and collateral ligaments of ten corpses were also examined, and the collateral ligaments exposed to a load which was increased to the point of their destruction. The average values found in this manner were 26.5 kp for the metacarpo-phalangeal collateral ligaments and 15.4 kp for the interphalangeal collateral ligaments. This means that the pain threshold is usually below the destruction limit, so that generally there will be no spontaneous overloading. It is important for the construction of endoprostheses that their stability level should always be above that of the pain threshold and should attain at least the values of the tear tests, since otherwise these endoprotheses will not function properly. These basic prerequisites enable a comparative study of endoprostheses, the results of which will be presented at a later date.

Adult↗
PubMed1975

[Fatigue fractures in the anterior part of the pelvis following replacements of the hip-joints (author's transl)].

In a woman aged 74 fatigue fractures occurred in the anterior part of the pelvic ring following bilateral replacement of the hipjoints with Müller-Charnley prostheses. After increasing pain in the inguinal region radiographs disclosed fractures through the public and ischial bones on the side of the last replacement. There was no concomitant disease. The possible dynamic causes of fatigue fractures after well-placed hip-prostheses are discussed.

Aged↗