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Biomedical subjects

B Lindén

Publications and source records attributed to B Lindén.

17 recordsLinked to original sources
PubMed1992

Fixed implant-supported prostheses with welded titanium frameworks.

Eighty-six edentulous patients provided with Brånemark implants were randomly selected for fixed prostheses with modified framework designs. This study describes alternative laboratory techniques in which premachined titanium components are welded together to form the framework. Clinical experience, following the patients for 1 year after placement, indicates that it is a predictable technique with a similar pattern of complications as experienced by patients with cast frameworks supported by implants. The prostheses are considered to be slightly more bulky than cast frameworks, but seem to have, on a clinical level, a better fit to the implants.

Adult↗
PubMed1992

Osteochondritis dissecans of the elbow. A long-term follow-up study.

Thirty-one patients with osteochondritis dissecans of the capitellum humeri were followed for an average of 23 years. There were symptoms in about half of the elbows at the follow-up examination. Impaired motion and pain on effort were the most common complaints. Roentgenographic signs of degenerative joint disease were present in more than half of the elbows and correlated with a reduced range of motion. The diameter of the radial head increased in comparison with the contralateral elbow in two thirds of the patients.

Adolescent↗
PubMed1992

Failures and complications in 127 consecutively placed fixed partial prostheses supported by Brånemark implants: from prosthetic treatment to first annual checkup.

Ninety-six partially edentulous maxillae and mandibles were consecutively treated with 127 freestanding fixed prostheses supported by 354 implants. The patients were followed for 1 year and the overall success rate was 98.6% for the examined implants. None of the inserted prostheses was lost during the observation period. The most commonly reported problems during the first year of function were related to loose gold screws and esthetic complaints, complications that were easily resolved. Furthermore, the total number of complications was low and was less than has been reported for routine full-arch fixed prostheses.

Adolescent↗
PubMed1992

Failures and complications in 92 consecutively inserted overdentures supported by Brånemark implants in severely resorbed edentulous maxillae: a study from prosthetic treatment to first annual check-up.

Overdentures were consecutively inserted in 92 severely resorbed maxillae and followed for 1 year. The dentures were supported by a total of 430 implants. Of these, 69 (16%) became loose and were removed during the follow-up period. The mobile implants caused 7 complete failures of the overdenture treatment. Postinsertion maintenance was more extensive for the overdentures than for fixed prostheses supported by implants. Problems arose in relation to the mucosa around the implants, and there were also fatigue fractures of the acrylic resin and the retentive clips. Fewer speech problems were reported in the overdenture group when compared to those with fixed prostheses.

Adult↗
PubMed1978

Osteochondritis dissecans and brachymesophalangia: a hereditary syndrome.

A kindred with an unusual congenital hand and foot anomaly is presented. It is an autosomal dominant hereditary disorder characterized by brachymesophalangia, slight clinodactyly, deformed metacarpal heads, osteochondritis dissecans in metacarpophalangeal joints, absence or hypoplasia of the ulnar styloid processes, and brachyhypophalangia in the feet.

Adult↗
PubMed1977

Symptomatic chondrocalcinosis at the wrist.

Twenty-two patients with chondrocalcinosis in the wrists were treated for symptoms of pseudogout. All but 3 had signs of degenerative arthropathy; 2 patients also had chondrocalcinosis of other joints in the hand. The degree of chondrocalcinosis and the grade of arthrosis varied but there was no certain correlation between the two. Attacks of arthritis were the clinical features in 13 cases. The usual treatment was immmobilization and administration of phenylbutazone.

Aged↗
PubMed1977

Arthroplasty of the knee in osteoarthritis and rheumatoid arthritis.

147 cases of arthroplasty of the knee were reviewed. Three types of prostheses were used, viz., St. Georg, Geomedic and hinge (Shier and Guépar). Pain was the most common indication for the operation which produced complete or almost complete relief in 90% of the cases. In half of the joints with a mobility of less than 80 degrees preoperatively, the range of movement was increased to more than 80 degrees by the operation. Lack of extension, deformity and instability could be largely corrected. Two cases of deep infection were observed, both in patients treated with a hinge prosthesis. In one of them the complication led to amputation above the knee and in the other to arthrodesis.

Adult↗
PubMed1977

Osteochondritis dissecans. A histologic and autoradiographic study in man.

Surgically excised cylindrical specimens from 14 adult patients with osteochondritis dissecans in the knee joint were studied with histologic and autoradiographic techniques. The lesions were found to be composed of normal hyaline cartilage with no pathological changes. In the bone part of the specimens there were well-defined fissures at various distances from the tidemark. On both sides of the fissure, but especially on the OD side, there were scattered osteonecroses in complete disarray. No tetracycline fluorescence activity could be seen in the lesions.

Adult↗
PubMed1977

The radiolucent zone in arthroplasty of the knee.

Roentgenograms of 138 knee joint arthroplasties were examined for the presence and extent of a radiolucent zone at the bone-cement interface. Such a zone was significantly more common around the plastic tibial part than around the metallic femoral part of non-hinged prostheses. This observation argues for the theory that the development of heat plays a part in the causation of the zone. In some cases a zone was demonstrable within 1 month of the operation. The frequency and the sizes of such zones increased during the first 6 months after the operation. There was no definite correlation between the development of a radiolucent zone and the clinical symptoms.

Arthroplasty↗
PubMed1976

The incidence of osteochondritis dissecans in the condyles of the femur.

The incidence of osteochondritis dissecans in the condyles of the femur was studied in a defined population and was found to be twice as common in men as in women; the maximum incidence in both sexes being between the ages of 10 and 20. The site of the lesion in the condyles did not differ between age groups. The indicence of diagnosied cases has increased somewhat in recent years but only in men. The incidence in the population is less than has been suggested in the past.

Adolescent↗
PubMed1976

Strontium-85 uptake in knee joints with osteochondritis dissecans.

The uptake of Strontium-85 in the distal end of the femur and in the immediate vicinity of the lesion was measured in 12 young ment with ostoechondritis dissecans. The uptake was significantly but only slightly increased. It was confined to the area of the lesion, was less than observed in early cases of gonarthrosis and an order of magnitude less than in cases of osteonecrosis. It is concluded that the repair process of osteochondritis dissecans is very slow and involves only minor part of the bone tissue surrounding the lesion.

Adolescent↗
PubMedDate not supplied

Chondrocalcinosis following osteochondritis dissecans in the femur condyles.

Chondrocalcinosis, defined as radiopaque deposits in the joint cartilages and in semilunar cartilages of the knee joint, develops frequently in patients in whom osteochondritis dissecans is diagnosed after the epiphyseal line of the distal end of the femur is closed. Chondrocalcinosis occurred in 2/3 of the cases surgically treated for osteochondritis. The incidence was greater than in knees treated by arthrotomy for ruptured semilunar cartilages. However, the latter show chondrocalcinosis much more frequently in patients without history of injury or arthrotomy. Osteochondritis patients with chondrocalcinosis more often may have joint effusion than patients with other conditions. The chondrocalcinosis is not confined to that part of the joint which was the site of the osteochondritis lesion. The presence of chondrocalcinosis can be correlated with a poor prognosis of the knee including severe gonarthrosis.

Chondrocalcinosis↗
PubMedDate not supplied

Morphology and crystal composition of chondrocalcinosis after osteochondritis dissecans.

Three patients, who in their youth had been operated upon for osteochondritis dissecans in the femoral condyles, and who had developed gonarthrosis and chondrocalcinosis 30 years later, were investigated by arthrotomy. Tissue was obtained from the semilunar cartilages, the joint cartilages and the synovialis, for crystal analysis and morphological studies. The calcium deposits were with X-ray diffraction and polarization microscopy, The compound found was mainly calcium pyrophosphate dihydrate. Crystals were seen in all the tissues studies and the deposits could also be seen in micro-radiography. The histological examination demonstrated mainly degenerative, but also regenerative changes in the articular cartilage. On the site of the osteochondritis lesion the fibrous tissue was very rich in crystals. In the semilunar cartilages and the synovialis crystals were also seen.

Adult↗