Search PubMed⌕ Search

Biomedical subjects

O Paar

Publications and source records attributed to O Paar.

90 records · Page 5Linked to original sources
PubMed1982

[Cartilage injuries of the femoro-patellar joint in the computerized tomogram].

The conventional arthrographic methods for demonstration of the femoro-patellar joint are not sufficiently reliable. Through the use of CT-arthrography a cross-sectional image free of superimposition and possessing a high density resolution is available thus facilitating a direct demonstration of the joint cartilage. Traumatic and degenerative lesions of the cartilage can be clearly shown by CT-arthrography. Damage of cartilage in patients with chondromalacia patellae can be differentiated in its different stages. The shape of the patella and its relation to femoral condyles can be evaluated more accurate than by conventional axial x-rays.

Adolescent↗
PubMed1982

[Gluing of fresh cartilaginous lesions of the talus using concentrated fibrinogen adhesive (author's transl)].

Lesions of the talar cartilage are extremely difficult to diagnose clinically or roentgenologically. Often they are masked by accompanying lesions of the bone or the capsular ligaments, so that arthrotomy will be necessary to obtain information on the condition of the cartilage. Reconstruction of the articular surface is a most important prerequisite für restoring the ability of the cartilage to cope with physiological load. Hence, the aim of the treatment is the replantation of abraded cartilaginous fragments. The use of concentrated fibrinogen as a biological tissue adhesive has been gaining in importance as an alternative to the methods of refixation practised so far. The actual process of gluing is technically simple. 7 patients in whom gluing of the cartilage at the talus had been performed, remained free from complaints for a follow-up period of three years.

Cartilage, Articular↗
PubMed1982

[Patella dislocation with special reference to cartilage damage].

Dislocations of the patella are discussed in the light of their pathogenesis, their possible injury pattern and their consequences. An exemplary case is presented. Especially the injury to the retropatellar cartilage with following chondromalacia--sometimes initiating the development of patellofemoral osteoarthritis--renders the dislocation of the patella a severe injury of the knee region. In case of spontaneous reduction and uncertain history the diagnosis may be difficult. The dislocation of the patella can be suspected if a hemarthrosis is found without an instability of the knee ligaments. The possibilities of an operative repair are described with special regard to the cartilage injury. Importance was layed upon the shape variabilities of the patellofemoral joint predisposing to recurrent dislocation.

Adolescent↗
PubMed1978

[The relative elongated patellar ligament after identation of the lateral retinacula (author's transl)].

The treatment of the lateralisation of the patella can be done by lateral indentation of the retinaculum patellae (method of Viernstein). Caused by the medialisation of the patella eventually the patellar ligament can be realtively elongated. This leads to insufficiency of the extensors and therefore to prearthrosis of the knee joint. To avoid this and to conserve the sportive ability we recommend the displacement of the tuberositas tibiae to medial and distal.

Adult↗
PubMedDate not supplied

[Disruption of the arteria nutricia tibiae by reamed and unreamed intramedullary nailing. Study of the vascular architecture of the human tibial intramedullary cavity].

AIM: By reason of the pseudarthrotic healing of fractures due to vascular complications after reamed and unreamed intramedullary nailing, the intraosseous course and branching of the tibial nutrient artery and its impairment by nailing procedures needs an actual analysis. METHOD: The nutrient vessel of 24 tibiae taken from fresh corpses were prepared by injection of Technovit and lead oxide. After this procedure the medullary cavities of 12 bones were opened by a frontal cut. These specimens were subjected to routine maceration. The other 12 tibiae were naed with the unreamed (6) and the reamed nailing (6) techniques. X-rays were also taken routinely. RESULTS: After penetration of the tibial compact bone the main trunk of the nutrient vessel runs through a perforated osseous tunnel (pars tecta arteriae nutriciae tibiae). At its end the vessel divides into a descending branch (obligate) and two ascending branches (facultative). The descending branch lies near to the centromedial region of the medullary cavity which is termed as the pars liberal arteriae nutriciae tibiae. All branches pass through supporting horizontal osseous lamellas. Due to this topography the reamed nailing technique destroyed the nutrient vessel completely in all specimens. In contrast to this observation the unreamed nailing destroyed the vessel completely only in 1 (16.7%) and partially in 3 (50%) bones; 2 (33.3%) specimens exhibited no destruction of the vessel. CONCLUSION: The unreamed as well as the reamed nailing technique can destroy the intramedullary course of the tibial nutrient artery. Fractures as well as displacement osteotomies or corticotomies are able to diminish the medullary blood supply seriously, if they are localised within the area of the tactic an of the tibial nutrient artery.

Aged↗
PubMedDate not supplied

[Patellofemoral pressure and contact surface measurement in the 'hunter's hat patella'. Experimental studies of sagittal patella osteotomy].

One reason of the chondromalacia patellae is the functional incongruence due to a patellofemoral dysplasia like for example the so called hunter's hat deformity. As a curative treatment in those cases an osteotomy of the patella may be carried out. This operation shall improve the congruence of the articular surface as well as the stability of the patella. There are experimental studies describing the femoropatellar pressure situation in eight cases with a surgical induced hunter's hat patella after osteotomy. The results represent a significant increase of the opposing surfaces in the medial compartment and a more uniform distribution of the femoropatellar pressure.

Cartilage Diseases↗
PubMedDate not supplied

[Intra-articular pressure measurement. A new method for the use of the pressure measuring film "Prescale"].

We present a new procedure to protect Pressure measuring film from moisture and to facilitate its application in sphaerical joints without crinkles, shearing or friction artefacts. The film is cut into narrow laminas and embedded between two layers of an OP-site-foil. After this treatment, the film is still able to be gauged and even to bear a gas sterilization without any loss of measuring range or accuracy.

Biomechanical Phenomena↗