Biomedical subjects

M Baleani

Publications and source records attributed to M Baleani.

21 records · Page 2Linked to original sources

PubMedDate not supplied

Comparative and experimental study on different tendinous grasping techniques in rotator cuff repair: a new reinforced stitch.

Arthroscopic repair of wide rotator cuff ruptures is burdened by a percentage of recurrences that is greater than the repair carried out when an open technique is used. One of the main reasons for this difference can be searched for in the minor hold of stitching on the tendinous aspect obtained with arthroscopic repair. In fact, when an open technique is used, good hold can be guaranteed by using reinforced stitches such as the modified Mason-Allen. Thus, arthroscopic repair technique on the tendinous aspect, particularly in wide and massive injuries, must be improved. It was the purpose of this study to compare a new reinforced stitch that can easily be obtained in arthroscopy (simple stitch that orthogonally crosses a horizontal stitch previously knotted on the tendon: SS-HL), with traditional stitches (simple stitch, mattress-stitch and modified Mason-Allen stitch). Tests were carried out on sheep infraspinatus tendons in order to evaluate the resistance of pull-out. The SS-HL stitch showed resistance to loading that was similar to that when the modified Mason-Allen was used, but it was greater than that shown by the simple stitch (+48%) and the mattress stitch (+35%).

Animals↗

PubMedDate not supplied

Metallic wear debris in dual modular hip arthroplasty.

Two cementless hip arthroplasty models with a modular neck made titanium alloy were submitted to cyclical loading in air, in physiological solution, and in a solution for accelerated corrosion tests in order to study the damage process of modular couplings. Thereafter, on one of the two models a series of tests were conducted in order to evaluate the quality of debris produced by the couplings. The parameters of testing adopted allow us to estimate the production of metallic debris observable in vivo with this type of prosthetic stem. The results show that the couplings of modular prostheses may be the source of metallic debris. The amount of debris produced depends on the geometry of the coupling and of the entire implant. Good planning and realization of the couplings, however, reduce the phenomenon that is negligible as compared to other potential sources of debris such as the surface of the stem or of the prosthetic head.

Bone Substitutes↗

PubMedDate not supplied

Computerized mechanical validation of custom-made stems.

The new community laws regarding medical devices require that custom-made devices be prescribed by the surgeon, who assumes responsibility for the device along with the manufacturer. It is the purpose of this study to indicate a method that allows use to check whether custom-made prostheses in particular conform to the requirements established by European laws; these are prostheses produced in a single model and that have rather short development and realization times. The pre-clinical method of validation proposed, based on a calculation with finite elements, was first verified by in vitro measurements and then used to evaluate 15 cases selected among the most critical ones in terms of size and/or geometrical irregularity from a group of 100 stems that had already been implanted. The method proposed was confirmed to be accurate and reliable; in 3 out of 15 stems analyzed we found values for mechanical resistance that were less than minimum values required by law.

Arthroplasty, Replacement, Hip↗