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Biomedical subjects

J H Oh

Publications and source records attributed to J H Oh.

At least 55 records · Page 3Linked to original sources
PubMed1997

Psychiatric illness and syncope.

Studies have reported a high prevalence of psychiatric illness in patients with syncope, particularly among those with syncope of unknown etiology. Although mortality rates for patients with syncope and psychiatric disorders tend to be lower than for patients with cardiac cause for syncope, treatment of these psychiatric illnesses appears to result in lower rates of recurrence of the symptoms. The authors recommend an assessment for psychiatric illness in those patients in whom the initial evaluation does not suggest an organic cause for syncope. Further studies are needed to elucidate the pathophysiologic mechanisms for syncope and the effects of treatment of psychiatric illness on recurrence of syncope.

Humans↗
PubMed1995

Cementless total hip arthroplasty in patients with osteonecrosis of the femoral head.

The authors studied 61 patients (78 hips) who had avascular necrosis of the femoral head, seen in followup for an average of 7.2 years (range, 6-9 years) after they had primary cementless porous-coated total hip arthroplasty. This study was undertaken to determine whether cementless porous-coated prostheses have any merit over reported cemented total hip arthroplasty using contemporary techniques. The average age of the patients at the time of surgery was 48 years old (range, 20-73 years). The average preoperative hip score was 45.6 points (range, 28-75 points), which improved to 90.3 points (range, 34-100 points) at the 7.2-year followup examination. Sixteen of 78 arthroplasties failed in the period of followup, for an overall failure rate of 20.5%. Of the failed hips, 11 had femoral component loosening, 4 had femoral and acetabular component loosening, and 1 had excessive wear in the polyethylene liner. Four femoral components and 5 acetabular components were revised. Twenty-one of the 78 hips (27%) had an average of 5.6 mm (range, 3-9 mm) of wear in the polyethylene liner. Sixteen (20.5%) of 78 hips had acetabular and femoral periprosthetic osteolysis, and 22 (28.2%) hips had femoral periprosthetic osteolysis only. The cementless total hip arthroplasty in this series had a higher incidence of aseptic loosening of the femoral component, polyethylene liner wear, and periprosthetic osteolysis than that reported for cemented total hip arthroplasty using contemporary techniques.

Adult↗
PubMed1995

Evaluation of the anatomic patellar prosthesis in uncemented porous-coated total knee arthroplasty: seven-year results.

We studied 41 patients (56 knees; mean patient age, 55.3 years) who were followed up for a minimum of 7 years (range, 84 to 90 months) after primary resurfacing arthroplasty of the patella with an anatomic patellar prosthesis during uncemented porous-coated anatomic total knee arthroplasty. The operative diagnosis was osteoarthritis in 33 knees; rheumatoid arthritis in 16; tuberculous arthritis in 4; posttraumatic arthritis in 2; and ankylosis in 1. The average preoperative Hospital for Special Surgery knee score was 33 points (range, 10 to 69 points), which improved to 81 points (range, 54 to 100 points) at the final follow-up examination. There was a high rate of component loosening (23 knees or 41%). A total of 27 of 33 solidly fixed patellar prostheses (82%) had osteolysis in the patella. Forty-two knees (75%) had wear of the tibial polyethylene liners; a mean of 2.5 mm in the medial compartment and 1.7 mm in the lateral compartment. Our experience does not support the continued use of this prosthesis.

Adult↗
PubMed1995

Osteolysis around cementless porous-coated anatomic knee prostheses.

We report the incidence of osteolysis in the femur, tibia, and patella of 44 consecutive patients (60 knees) who were followed for more than seven years after cementless knee arthroplasty with a Porous-Coated Anatomic prosthesis. The average age of the patients was 56.5 years (17 to 73); the operative diagnosis was osteoarthritis (33 knees), rheumatoid arthritis (17), tuberculous arthritis (7) and post-traumatic arthritis (3). All patellae were resurfaced. No femoral or tibial component was loose at the final follow-up examination. Thirty patellar components were loose of which six had been revised. Radiographs revealed osteolysis in 90% of the tibial plateaux and in 80% of the 30 intact patellar prostheses. No osteolysis was seen around any femoral component. In 50 knees (83%) the average wear of the polyethylene liner was 2.5 mm in the medial compartment and 1.7 mm in the lateral compartment. Four of 60 knees (6.7%) were revised for complete wear of the polyethylene liner of the tibial component. Fixation of the tibial and patellar components without cement fails to seal the interface between bone and prosthesis and allows the migration of polyethylene particulate debris which causes osteolysis.

Adolescent↗
PubMed1994

Comparison of Cotrel-Dubousset pedicle screws and hooks in the treatment of idiopathic scoliosis.

Eighty-two patients with idiopathic scoliosis were treated by Cotrel-Dubousset instrumentation between 1987 and 1991. Twenty were treated with hooks only, 47 with screws and hooks, and 15 with screws only. The methods were compared and the findings showed that screw fixation can be used in the thoracic spine without neurological complications. The screws provided immediate stability with rigid fixation, together with better correction of frontal, sagittal and rotational deformity. There is less loss of correction, a shorter fusion and less risk of neurological complications because of the placement outside the spinal canal and the rigid fixation in derotation. The technique was simpler and the operating time shorter than with the other methods.

Adolescent↗
PubMed1992

Salvage of neglected unstable intertrochanteric fracture with cementless porous-coated hemiarthroplasty.

A cementless porous-coated femoral prosthesis with a long stem was implanted in seven patients who had untreated comminuted unstable intertrochanteric fractures of the femur associated with a posterior dislocation of the femoral head. The average age of the patients was 35 years (range, 25-52 years). The length of follow-up observation averaged 45 months (range, 23-60 months). The hip rating at the final follow-up examination ranged from 82 to 100 points (average, 96 points). The follow-up roentgenographs of these patients revealed complete consolidation of the fracture site and no evidence of subsidence or loosening of the prosthesis. There was no indication of detrimental bone remodeling phenomenon in this series. Hemiarthroplasty with a cementless, porous-coated, long-stem prosthesis can be effective treatment for this complex fracture dislocation.

Adult↗