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Biomedical subjects

P M Calderale

Publications and source records attributed to P M Calderale.

At least 19 recordsLinked to original sources
PubMed1987

Biodynamic total hip prosthesis.

The biodynamic total hip prosthesis which was devised in 1977-78 and implanted in 1979 was derived from a series of experimental studies and a lengthy clinical experience, both dating back to 1968. This prosthesis introduced two new and original concepts into the field of prosthetic hip surgery: 1) the biequatorial design of the cup; 2) the preservation of the femoral neck. This prosthetic system is based on maximum preservation of the bone stock as well as hip function. The biequatorial cup allows for positioning corresponding to that of the normal acetabulum. The femoral component incorporates features (collar, sagittal and frontal angulation, external surface, etc.) which facilitate proximal cortical fixation and cancellous metaphyseal biological anchoring, thus ensuring total adhesion. The average 3.5 years follow-up (maximum 7 years, minimum one year) in 280 cases confirms the effectiveness of this prosthesis and the validity of the basic principles on which it is founded.

Adult↗
PubMed1983

Effect of temperature changes in acrylic cement on prosthetic implant surgery. An investigation into the relationship between quantity and temperature changes at different levels on loosening of the implant.

Loosening of the prosthetic stem is one of the most frequent problems in arthroprosthetic replacement. Fixation at the bone/cement interface is therefore of crucial importance. This can be affected by several factors, one of which is the heat generated in the acrylic cement, which may exceed the level at which tissue viability is affected. The authors therefore investigated this phenomenon in theoretical models. These were related to the level and duration of temperature changes at four levels - inside the cement and at the interfaces between cement, implant, spongy bone and cortical bone. Graphs showing temperature peaks and duration are constructed in all the varying conditions and their implications discussed. These concern the viability of osteocytes and vascular tissue, and the mechanical strength of the cement. The implications on design and surgical technique are obvious and point to the need to use the thinnest layer of cement compatible with firm fixation.

Acrylates↗
PubMed1979

Relationship between structure and the stress pattern in the human mandible.

The internal bony structure of ten dentate human mandibles was examined on lateral radiograms, and the condylar shape measured with a digital electronic machine. The external surface was coated with photoelastic material. Each mandible was then placed in centric occlusion with brass replicas of the upper arch and the glenoid fossae and set in a supporting frame. Occlusal loads were simulated and the isoclinics recorded in plane-polarized light. The isostatic flow lines were constructed for each mandible. A relation was found between the mandibular structure and the distribution pattern of these lines.

Adult↗
PubMed1979

Newly built facilities for ballistocardiography at the Polytechnic of Turin.

The role of recent research started in Italy, funded by the National Research Council, is stressed. The newly built Bcg facilities at the Polytechnic of Turin are concisely described. Current experimental research concerns the evaluation of a new type of concave-convex Bcg bed. Results from three healthy male individuals are shown and briefly discussed.

Academic Medical Centers↗