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Biomedical subjects

O M Jardon

Publications and source records attributed to O M Jardon.

16 recordsLinked to original sources
PubMed1991

Uncemented total hip arthroplasty. Prospective analysis of the tri-lock femoral component.

Fifty consecutive hip disease patients (56 hips) with total hip arthroplasties (THA) utilized the uncemented Tri-Lock femoral component. Forty-five patients (51 hips) were followed for an average of 46 months (range, 24-66). Forty-two patients (47 hips) were followed with clinical examination and roentgenographs, three (four hips) by telephone interview, four (four hips) were deceased, and one (one hip) was lost to follow-up evaluation. The diagnoses included osteoarthritis (30 hips), avascular necrosis (11 hips), juvenile rheumatoid arthritis (two hips), and degenerative joint disease secondary to childhood hip disorder (four hips). Of 47 hips, 34 were graded excellent, seven good, three fair, and three poor using the Harris hip score. The incidence of thigh pain was 19% at one year, but only 6% at final follow-up evaluation. Limp persisted in 19% of the patients. Of the three patients with four hips contacted by telephone, two had slight pain and two had no pain. The roentgenographic results found an alarming 38% incidence of varus shift of the components, relative to their preoperative position. The presence of a varus shift did not adversely affect the clinical results. Early experience with the Tri-Lock femoral component shows results comparable to those reported in the literature. The high incidence of femoral component shift, presumably because of geometry of the stem is of concern. Longer follow-up evaluation will be necessary to determine the fate of these uncemented THA operations.

Adolescent↗
PubMed1988

Bone-ingrowth hip prostheses in asymptomatic patients: radiographic features.

The radiographic changes of 85 bone-ingrowth femoral prostheses in 77 asymptomatic patients were reviewed. The average postoperative follow-up time was 21.8 months. In decreasing order of frequency, the alterations included (a) remodeling of the proximal medial edge of the cut femoral neck (stress shielding) (98%), (b) linear lucency with a thin sclerotic margin at the prosthesis-bone interface (that may increase in width or length with time) (79%), (c) endosteal sclerosis at the prosthesis tip (36%), (d) heterotopic bone (24%), (e) cortical thickening at the tip of the prosthesis (12%), (f) prosthetic subsidence (7%), (g) intraoperative fracture (7%), and (h) periosteal reaction (4%). In this study, radiographic evidence of these findings was not associated with clinical failure. This is in distinction to the findings in cemented prostheses, in which many of these phenomena (especially the development of increasing width of the lucent line adjacent to the cement or prosthesis) have been associated with failure. Long-term investigations of porous-coated prostheses are necessary. Currently, however, an awareness of the radiographic alterations that occur with asymptomatic bone-ingrowth prostheses can prevent their misinterpretation as abnormal.

Female↗
PubMed1986

Scapulothoracic dissociation. A case report.

A 26-year-old man sustained a scapulothoracic dissociation (STD) as a result of severe shoulder girdle trauma. In this recently described syndrome, multiple fractures of the upper extremity and closed disruption of the scapula from the thorax are combined with damage to the local neurovascular structures. The occurrence of blunt subclavian arterial injury and STD indicates the possibility of severe brachial plexus lesions.

Adult↗
PubMed1986

Evaluation of the Noiles hinged knee prosthesis. A five-year study of seventeen knees.

The Noiles hinged knee prosthesis has been reported to diminish sheer and tensile loading on the cement-bone interface. Theoretically, this should eliminate the complication of loosening, commonly reported in hinged total knee prostheses. We reviewed the cases of all of the patients who have been treated with the Noiles knee prosthesis at our institution. Eighteen knees in fourteen patients were available, seventeen of which were followed for more than five years. Although all of the prostheses did well initially, ten knees in eight patients (56 per cent) had failed by an average of thirty-two months postoperatively. These eight patients included four of the five who weighed more than ninety kilograms and all of those who had had a prior arthroplasty. The failures were clearly defined along the lines of sex distribution. Measurements on the radiographs showed a significant difference between sexes in the metaphyseal diameter and thus in the percentage of the femoral canal that was filled by the prosthesis and cement. We concluded that prosthetic design must incorporate cortical cement support to reduce stress at the cement-bone interface, especially in a medullary canal with a larger diameter.

Adult↗
PubMed1982

Rupture of tibialis posterior tendon in a closed ankle fracture.

Presented is a case report of a tibialis posterior tendon rupture associated with a closed ankle fracture. The treatment is open reduction and fixation at the bony fragments with primary repair of the tendon. This injury, although rare, illustrates that soft-tissue injuries must be considered in the management of unusual or complex fractures.

Adult↗
PubMed1979

Malignant hyperthermia. A potentially fatal syndrome in orthopaedic patients.

Malignant hyperthermia is an inherited muscular disorder and a cause of sudden death in afflicted patients. Stress arising from tramuma, surgery, and other causes can initiate the syndrome. We studied the types of orthopaedic problems commonly seen in patients with this condition as well as the clinical manifestations and pathophysiology of the syndrome. Recognition, management, and understanding of the pathophysiology of malignant hyperthermia can be aided by a study of its similarities to porcine stress syndrome. We performed experimental studies of muscle and prophylaxis in swine. We also demonstrated the extension of the prophylactic use of dantrolene sodium in a management protocol in eighty surgical procedures in humans.

Adult↗