Biomedical subjects

L Konradsen

Publications and source records attributed to L Konradsen.

24 records · Page 2Linked to original sources

PubMedDate not supplied

Long distance running and osteoarthrosis.

In order to evaluate the effect of long-term, long distance running on the incidence of degenerative joint disease in the lower extremities, we examined the hips, knees, and ankles of 30 long distance runners who had been serious competitive runners in the early 1950s (at the age of 20 to 30 years). Of three runners who were no longer active, one had stopped running in the late 1970s because of osteoarthrosis of both the lower and upper extremity joints. The remaining 27 runners (90%) were still active, having run 20 to 40 km/week (12 to 24 miles/week) for a median of 40 years. Subjective, objective, and roentgenographic data were compared with the data for 27 nonrunning controls matched as to age, weight, height, and occupation. No differences in joint alignment, range of motion, or complaints of pain were found between runners and nonrunners. Roentgenographic examinations for cartilage thickness, grade of degeneration, and osteophytosis were also without significant differences between the two groups. Thus, our observations suggest that a lifetime of long distance running at mileage levels comparable to those of recreational runners today is not associated with premature osteoarthrosis in the joints of the lower extremities.

Aged↗

PubMedDate not supplied

Ankle inversion injuries. The role of the dynamic defense mechanism.

We investigated the role of a muscular defense in the stabilization and protection of the ankle joint against sudden forced inversion. Ten volunteers with mechanically stable ankles were tested in different standing and walking situations using a trap door model and lower extremity electromyography and electrogoniometers. Peroneal electromyographic activity was observed 54 msec after the detection of ankle inversion. This latency was shorter when the ankle was already in inversion and longer with the ankle in eversion. Quadriceps and hamstring muscle electromyographic activity occurred 68 msec after the ankle inversion stimulus. Evidence of active eversion was seen 176 msec after sudden inversion. Active changes in knee and hip joint angles occurred even later. In contrast, the trap door rotated 30 degrees in approximately 80 msec. We conclude that the reflex reaction to sudden inversion is initiated at a peripheral level by the inversion motion followed by a reaction pattern mediated by spinal or cortical motor centers. Both peripheral and central reactions, however, seem too slow to protect the ankle in case of sudden inversion occurring at the time of heel contact.

Adult↗

PubMedDate not supplied

Ankle sensorimotor control and eversion strength after acute ankle inversion injuries.

We performed this study to monitor changes in ankle eversion strength and sensorimotor control functions after acute ankle inversion injury. Forty-four patients with clinical grade II to III first-time ankle inversion sprains were tested for 1) pathologic talar tilt and anterior talar translation at 1 and 12 weeks after injury; 2) isometric eccentric ankle eversion strength and 3) peroneal reaction time to sudden ankle inversion at 3, 6, and 12 weeks after injury; and 4) accuracy of inversion position assessment 1, 3, 6, and 12 weeks after injury. Not all patients could perform all tests at the early follow-up visits. There was mechanical instability in 19 of 40 tested patients at 1 week and in 4 patients at 12 weeks after injury. Eversion strength was 88% of the contralateral side 3 weeks after injury, rising to 96% after 12 weeks. The magnitude of error of inversion position sense was 190% of the contralateral side 1 week after injury; this was still affected after 12 weeks, but fell to 133%. Patients with pathologic talar tilt or anterior talar translation, or both, at 1 week after injury did not show significantly greater error in position assessment or reduction in eversion strength when compared with patients with ankles that remained stable after injury.

Acute Disease↗

PubMedDate not supplied

The effect of anterior cruciate ligament trauma and bracing on knee proprioception.

We studied the effect that chronic anterior cruciate ligament disruption, functional bracing, and a neoprene sleeve have on knee proprioception by measuring the threshold to detection of passive knee motion in all three conditions. The threshold to detection of passive knee motion was worse in knees with chronic anterior cruciate ligament insufficiency when compared with uninjured knees. This difference was small, on average an additional 0.28 degree of flexion-extension rotation was required for the anterior cruciate ligament-deficient knee before the subject detected motion, and of questionable significance from a clinical and functional perspective. Wearing a functional brace or neoprene sleeve on the anterior cruciate ligament-deficient knee did not significantly change the threshold to detection of passive motion in comparison with the same knee without a brace, although improvements were observed. There was no relationship between the most common clinical means of characterizing altered biomechanics of the anterior cruciate ligament-deficient knee (that is, the magnitude of anterior-posterior knee laxity and the grade of pivot shift) and the threshold to detection of passive knee motion.

Adult↗

PubMedDate not supplied

Popliteal valve incompetence and postoperative deep vein thrombosis.

In 79 patients undergoing hip or knee replacement surgery the preoperative condition of the popliteal vein valves was assessed by Doppler ultrasonography. Presence of postoperative deep vein thrombosis was determined by bilateral ascending phlebography seven to ten days after surgery. Antithrombotic prophylaxis consisted solely of TED stockings and early mobilization. The overall incidence of deep vein thrombosis was 20%. All thrombi were calf vein thrombi. One of these thrombi extended into the popliteal region and two into the femoral region. The incidence of deep vein thrombosis in patients with preoperative popliteal vein reflux when compared with patients with a normal popliteal valvular function was 55-15% (p less than 0.01). The incidence of deep vein thrombosis was also significantly lower in patients operated under epidural anaesthesia compared with patients under general anaesthesia. It is concluded that valvular incompetence of the popliteal vein predisposes to postoperative deep vein thrombosis.

Aged↗

PubMedDate not supplied

Distal metatarsal osteotomy for bunionette deformity.

Surgical treatment of a bunionette deformity was carried out in 54 feet (36 patients) using the Hohmann displacement osteotomy modified by Thomasen on the fifth metatarsal. Forty-eight operated feet (32 patients) were evaluated 69 months postoperatively (median). The patients were fully satisfied in 88% of the cases and partly satisfied or unsatisfied in 12%. The fully satisfied patients stressed the fact that they were now able to wear whatever style of footwear they desired. The objective success rate was 78% (6% recurrences, 10% transfer lesions, 4% intractable plantar keratosis and 2% operative complications). The authors conclude that the operation is an effective treatment for the bunionette deformity, and that the effect of the operation appears to be long lasting, with few reappearances 5 to 6 years after the operation.

Adolescent↗