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At least 253 records · Page 14Linked to original sources
PubMed1991

[Mechanical changes in the femur induced by a joint prosthesis. Comparative extensometric studies].

This study using electrical extensometry is aimed at comparing the relative deformations of the same fresh femur before and after the successive implantation of the following titanium prostheses: a cement-free prosthesis with metaphyseal endocortical support, a cemented prosthesis with, then without collar, and finally a screwed titanium prosthesis. The 56 deformation measurement paths produce an overall exploration of the behavior of the femur. The results applied to the same straight section of the femur are different from those of earlier works. The density of the measurement areas has particularly been increased in the upper metaphysis by the use of bidirectional gages. The loading device ensures the absence of variations of the external stress torsion transmitted to the femur between the individual prostheses. The results recorded with the cement-free prosthesis with metaphyseal endocortical support and with the collar-free cemented prosthesis are very similar. The incidence of the "collar effect" is very low in spite of optimal in vitro implantation conditions ensuring good contact between the collar and the neck of the femur. The screwed prosthesis is the implant that most stiffens the upper end of the femur. The testing procedure chosen has allowed recording the deformations caused by the mere insertion of the implants and the bone. The importance of the upper metaphysea endocortical support of the cement-free, screwless implant contributes in ensuring a better primary anchorage, producing stresses that will then foster the secondary anchorage through endosteal osteogenesis.

Biomechanical Phenomena↗
PubMed1991

[Distribution of transverse dimensions of the patella in the adult population. Relation to the development of the patellar component in knee joint prosthesis].

The development and manufacture of the patellar component was associated with a more detailed osteometric investigation of the patella and evaluation of its range of sizes in our population. Evaluation of data 1042 probands (477 women, 565 men) proved: a) there are no significant lateral differences of transversal dimensions of the patella and femoral condyles; b) The mutual relationship of the above mentioned dimensions does not correlate, and thus no conclusions can be drawn from the transversal breadth of the condyles on the dimensions of the patella; c) The range of patellar diameters in the population is very wide, and to meet demands, it will be necessary to manufacture patellar components in cca five sizes.

Adolescent↗
PubMed1991

[2- to 5-year follow-up of cementless implantable knee joint prosthesis of the Miller-Galante type].

Based on a prospective study protocol, the two- to five-year results of the Miller-Galante cementless total knee arthroplasty are presented. Sixty-four implants were placed in 59 patients: 60 implantations were cementless and 4 cemented. Clinically, the scores for pain, range of motion, walking and stair climbing improved significantly. Radiographically, the uncemented components displayed no signs of definite or possible loosening, whereas one of the cemented components was found to be definitely loose. On histological evaluation of the retrieved implants, all components had bone ingrowth.

Aged↗
PubMed1989

[Complications following hip joint prosthesis].

Complications seen after long-term follow-up examinations of total hip replacement should be treated immediately and completely. In the past decade a considerable increase in revisions has been noted. Radiographic assessment may be regarded as an effective means in diagnosing prosthetic complications from the surgeon's point of view. Examples are given. The difficulties in radiographic assessment of complications after cementless implantation or cemented prostheses without contrast media are mentioned. Prosthesis-related complications, such as mechanical loosening, infection with and without loosening, fatigue fractures and wear, fractures of the femur or pelvis, dislocations and surgical failures, are illustrated, as are clinical courses with gross loss of bone stock after repeated surgery and delayed revisions. Complications not related to the prosthesis such as periarticular ossification, muscle deficiencies, and nervous and vascular lesions are also explained using examples.

Hip Prosthesis↗