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Biomedical subjects

F Mazas

Publications and source records attributed to F Mazas.

At least 19 recordsLinked to original sources
PubMed1991

[Contribution of MRI to the preoperative evaluation of rotator cuff tears].

The authors report a series of 38 patients who had been examined by MRI and then operated for a rotator cuff syndrome. The correlation between the description of the cuff lesions after MRI and the surgical observations were excellent for 37 patients. In one case MRI showed a false image of tear of the supra spinatus m. on its anterior edge. This was due to a bad knowledge of the anatomy of the muscle and tendon and to a poor orientation of the frontal cut plane. This study was completed with MRI and anatomic study of 12 non embalmed cadaveric shoulders. The results showed that MRI was very sensitive (0.93) and specific (0.94) for the diagnosis of rotator cuff tears. MRI allowed also to show partial tears of the tendons of the rotator cuff. The authors propose a MRI classification of cuff lesions which permits to establish a good surgical planning.

Female↗
PubMed1990

[The total shoulder prosthesis].

Prosthetic shoulder replacement is impeded by two main obstacles: the articular cavity is very shallow, and the small glenoid surface rests on a narrow neck to which prosthetic pieces are difficult to attach. The principal, currently used prostheses are non-retentive models which reproduce the anatomy of the joint. They differ from each other mainly in the glenoid piece pattern which may be sealed only to the glenoid cavity or also fixed onto the acromion. On the whole, the clinical results reported are encouraging, particularly as regards the absence of pain, but the radiological course of the glenoidal sealing is a source of concern. Obvious unsealing is rare, but cracks between bone and cement are very frequent and some of them become wider as time goes by. In addition, there is still no satisfactory solution to the problem of big rotator cuff tears. This type of prosthesis must be envisaged with caution and should be reserved to very painful shoulders, but it would be wise not to wait until the rotator cuff is destroyed. The best indications are glenohumeral osteoarthritis, rheumatoid arthritis and necrosis of the tumoral head.

Humans↗
PubMed1989

[Evaluation of therapeutic trials published apropos of antibiotic prophylaxis in orthopedic surgery].

The authors review all the randomized clinical trials published since 1970 which evaluate the efficacy of antibiotic prophylaxis in orthopaedic surgery. Evaluation of the quality of these trials was based on two clinical and four methodological criteria. They also take into account reports which aim to define the best antibiotic prophylactic protocol, particularly with regard to the duration of treatment. In conclusion, although the majority of trials do not escape criticism, the efficacy of antibiotic prophylaxis in orthopaedic surgery can be considered as demonstrated. The duration of treatment is still an open problem. At the present time, the duration of drainage defines the length of antibiotherapy.

Anti-Bacterial Agents↗
PubMed1988

Prevention of postoperative venous thrombosis: a randomized trial comparing unfractionated heparin with low molecular weight heparin in patients undergoing total hip replacement.

A double blind randomized trial comparing subcutaneous enoxaparin (40 mg once daily) with standard unfractionated calcium heparin administered at a dose of 5,000 units every 8 hours in patients undergoing elective hip replacement has been performed. Treatment regimens began 12 hours preoperatively with enoxaparin, 2 hours preoperatively with standard unfractionated calcium heparin, and were continued for 15 days or until discharge. Venography was performed in all patients. Two hundred thirty-seven patients were included in the study: 113 received unfractionated heparin and 124 received enoxaparin. The incidence of proximal deep vein thrombosis was reduced from 18.5% in the unfractionated heparin group to 7.5% in the enoxaparin group (p = 0.014), and the incidence of total deep vein thrombosis was similarly reduced from 25% to 12.5% (p = 0.03). There were two major bleeding episodes and one minor bleed in the enoxaparin group compared to two minor bleeds in the unfractionated heparin group. Patients who received enoxaparin required fewer red blood cell transfusions and had a significantly higher hemoglobin on postoperative days 3 and 4. Thus prophylaxis with enoxaparin, 40 mg once daily, is simple, safe and more effective than standard low dose unfractionated heparin in preventing deep vein thrombosis in patients undergoing elective hip replacement.

Aged↗
PubMed1988

Two-day cefamandole versus five-day cephazolin prophylaxis in 965 total hip replacements. Report of a multicentre double blind randomised trial.

The aim of this trial was to compare a 5-day course of cephazolin with a regimen of 2 days of cefamandole in 965 total hip replacements (488 in the cefamandole group and 477 in the cephazolin group). The effect of the prophylactic antibiotic on the bacterial colonization of drains (mean duration of drainage: 3.2 +/- 0.3 days) and on the susceptibility of colonizing organisms was assessed. No significant difference was observed in the percentage of infected drains between the two groups. The cefamandole group had a lower rate of Gram-negative organisms (23% versus 44%, p less than 0.01). The rate of deep infections within one year after operation was 0.7% in the cefamandole group versus 0.5% in the cephazolin group, and the difference is not significant. Cefamandole given for two days appears to be an effective prophylaxis against sepsis in total hip replacements.

Aged↗
PubMed1988

[Functional and mechanical anatomy of arm elevation].

Experimental work on the functional anatomy of the shoulder has involved a study of the conditions involved in elevation of the arm. Movements of the upper limb are organised round a very special alignment of the scapulo-humeral joint whose geometric features and exact position have been determined. The ligaments of the joint play a major role in the controlling the attainment of this alignment. The value of this alignment in the physiology of the shoulder is demonstrated. A new terminology of shoulder movement is suggested.

Arm↗
PubMed1987

Anatomic basis of ligamentous control of elevation of the shoulder (reference position of the shoulder joint).

The authors describe in detail the position of greatest stability of the shoulder joint. They review the mechanical importance of this position in the overall physiology of the shoulder-girdle and stress the essential role of two articular ligaments of the shoulder joint (the coracohumeral and inferior glenohumeral ligaments) in arrival at this reference position. There thus exists a passive control, of ligamentous origin, of movements of the shoulder-girdle. The position is essential if the shoulder is to benefit from the full range of movement and full stability which it needs in every day functioning.

Humans↗
PubMed1986

[Nontraumatic aseptic osteonecrosis of the femoral head. Etiopathogenic, developmental and therapeutic considerations: review of the literature].

Aseptic non-traumatic necrosis of the femoral head occurs in patients with very unusual general state of health. Despite the fact that the metabolic abnormalities are better known today, many problems with regard to prognosis and treatment remain. According to the author's experience and, review of the literature, the authors consider that the production of tissue repair with hypervascularity is an aggravating factor. Disturbance of lipoproteins plays a major aetiological role. Decompressive forage should be reserved for the early stages. Secondary degenerative arthritis is almost constant after conservative surgery in cases that have been assessed. The authors obtained good results after Luck's adjusted cups and they consider that this is a reliable procedure. They have observed a high level of septic complications after total prosthesis. It is thought that this is related to the general condition of the patient.

Arthroplasty↗
PubMed1986

[Total radiocarpal prosthesis. Preliminary study].

The mechanical requirements before satisfactory muscular balance in a total wrist prosthesis have been studied in 25 cadavers. The centre of rotation was determined in X-Rays; it was localised in the sagittal plane crossing the axis of the forearm and in the frontal plane situated in front of the axis of the forearm. A graphic model of the wrist was then established. A total prosthesis was then designed, made up of two components with a torus surface. This prosthesis was found to be compatible with the wrist model. Movement required forces only slightly greater than normal muscular activity. One male was operated on using this prosthesis. The result was satisfactory after one year.

Adult↗