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Biomedical subjects

R W Bassett

Publications and source records attributed to R W Bassett.

7 recordsLinked to original sources
PubMed1998

Results of 1,000 Performance knees: cementless versus cemented fixation.

A total of 893 patients with 1,000 Performance total knee prostheses were retrospectively studied. The mean follow-up was 5.2 years. In 584 cases, the femoral and tibial components were implanted using cementless techniques, and in 416 knees the femoral and tibial components were cemented. All patients received a cemented all polyethylene patellar replacement. Tibial bone density determined fixation type. The average age of patients with cementless fixation was 64.3 years versus 76.2 years for patients with cemented implants. The average subjective and functional Knee Society scores were 91.2 and 90.1 for patients with cementless knees and 89.6 and 83.5 for those with cemented replacements. A surprising absence of osteolysis around screw fixation was noted, and at 5 years, there was 99% implant survival.

Adult↗
PubMed1990

Glenohumeral muscle force and moment mechanics in a position of shoulder instability.

The three-dimensional orientation of the shoulder girdle musculature was studied in five cadaver shoulders in the position of function at 90 degrees of abduction and 90 degrees of external rotation using a method of computer assisted gross muscle cross-section analysis. The muscle volume, muscle fiber length, and physiological cross-sectional area were obtained by dissecting two specimens. The line of action, the magnitude and orientation of the moment were calculated for each muscle crossing the shoulder joint. The quantitative description of the moment potential of muscle forces influencing shoulder function was thus obtained. The most effective flexors of the shoulder which also appear to resist anterior dislocation in the position studied are the pectoral, the short head of the biceps, coracobrachialis, anterior deltoid, and the subscapularis. Most of the rotator cuff muscles and the posterior deltoid acted as adductors, while the anterior deltoid, long and short head of the biceps, and supraspinatus were abductors. In this position, external rotation was effected by the long head of the biceps, coracobrachialis, and the posterior deltoid, while the majority of the remaining muscles acted as internal rotators.

Aged↗
PubMed1983

Acute tears of the rotator cuff. The timing of surgical repair.

Thirty-seven patients had surgical repair within three months after significant ruptures of the shoulder rotator cuff. Twelve were repaired within three weeks (Group 1), six within three to six weeks (Group 2), and 19 within six to 12 weeks after injury (Group 3). Follow-up periods averaged 7.0 years (range, 1.25-21.00 years). Pain relief was generally satisfactory; however, active postoperative abduction averaged 168 degrees for Group 1, 126 degrees for Group 2, and only 129 degrees for Group 3. At open operation, the tear size was graded as small, medium, or large. The correlation of average values of postoperative abduction (148 degrees, 152 degrees, and 133 degrees) with tear size was not statistically significant. Roentgenograms showed that rotator cuff disease is associated with glenohumeral arthritis. With evidence of an acute and complete disruption of the rotator cuff if one must consider surgery, early surgical repair (with 3 weeks of injury) affords the best opportunity for maximal recovery of shoulder function.

Adult↗
PubMed1980

Arthroscopy in acute traumatic hemarthrosis of the knee. Incidence of anterior cruciate tears and other injuries.

In a prospective study, all injured knees that had traumatic hemarthrosis and absent or negligible instability on clinical examination underwent arthroscopy and examination under anesthesia. Eighty-five knees (eighty-three patients) were examined over a 125-week period. Some degree of disruption of the anterior cruciate ligament was found in sixty-one (72 per cent) of the knees (a partial tear in 28 per cent and a complete tear in 44 per cent), frequently associated with an injury of varying severity to other joint structures. These included minor ligament sprains without laxity in 41 per cent, a major associated ligament injury in 21 per cent, meniscal tears in 62 per cent (partial in 30 per cent and complete in 70 per cent), and a femoral chondral fracture or surface defect in 20 per cent. A popping sensation at injury occurred in 33 per cent of knees with a normal anterior cruciate ligament and in 36 per cent of those with a disruption. One-third of the knees had no to slight pain at the time of injury. The anterior drawer test without anesthesia was positive in only 24 per cent of the knees with a torn anterior cruciate ligament. We concluded that: (1) a traumatic hemarthrosis indicates a significant knee injury; (2) examination under anesthesia plus arthroscopy allows a more accurate diagnosis of injury to joint structures; and (3) such data are required for a rational treatment program to be outlined.

Adolescent↗