Biases in a randomized comparison of three types of screw fixation in displaced femoral neck fractures.

We studied fixation of displaced femoral neck fractures prospectively in a randomized multicenter study, comparing 2 Olmed screws, 2 Tronzo screws and 3 Ullevaal hip screws. The study population consisted of 482 women and 125 men, of whom 432 women and 100 men were older than 65 years of age. Their median age was 80 (54-97) years.

The Hauser operation for patellar dislocation. 3-32-year results in 63 knees.

The Hauser operation for patellar dislocation was performed in 34 women and 20 men, median age 18 (3-55) years; one leg was amputated because of wound infection with chronic septic arthritis. At the time of follow-up, 8 (3-32) years after the operation 57 knees had normal or almost normal patellar stability, but only 26 knees were free from pain. Only 16 knees had both normal patellar stability and were without pain.

Sliding of the compression hip screw in femoral neck fractures.

Backing out of the compression screw in the sliding screw-plate hip osteosynthesis was analyzed in a series of 71 hips with medial femoral neck fractures during an observation period of 12-42 months, with a median of 26 months. In addition to the compression screw device, a parallel cranial lag screw was used. A postoperative primary diastasis in the fracture space of 1-5 mm in 11 cases did not predispose to major sliding of the screws or to healing problems.

Extra-articular stabilization of the knee a.m. Losee.

During 1979-81, 34 patients were operated according to Losee for chronic disabling anterior cruciate insufficiency. Twenty-nine patients were available for follow-up after 2 (1-4) years. At follow-up, 20 patients had a negative Slocum test.

Primary repair in posterior cruciate ligament injuries.

A retrospective study of 32 consecutive patients with acute injury of the posterior cruciate ligament (PCL) treated by primary repair is presented. Only six patients had isolated injuries of the PCL, five of these as avulsion of a bone fragment from the tibia. The remaining 26 patients sustained combined ligament injuries, including 18 total ACL tears.

Knee function following suture of fresh tear of the anterior cruciate ligament.

A retrospective consecutive series of 60 patients treated with primary suture of knee ligament injuries is presented. All patients had an anterior ligament (ACL) tear. In 54 patients this injury was combined with a medial compartment tear.

Effects of a distal venting hole in the femur during total hip replacement.

In 18 patients who underwent total hip replacement, the intramedullary pressure in the femur was measured during the insertion of the femoral prosthesis component. Half the patients had a pressure release hole (diameter 4.5 mm) drilled into the medullary canal at the distal end of the femur, the other half not.

Patellofemoral disorders treated by operations.

Thirty-six patients with patellofemoral disorders treated with various operative procedures were evaluated after an average follow-up period of 29 (6 to 72) months. Instability of the patella, either recurrent dislocation or subluxation, was present preoperatively in 27 knees (Group A). Twelve patients (Group B) were operated on for chondromalacia, which was not combined with a history of instability.

Effect of instability of experimental fracture healing.

Bilateral tibial osteotomy with fracturing of the fibula was performed on ten Wistar rats weighing 300--350 g. Intramedullary nailing was performed with 1.4 mm nails after reaming.

Anterior interbody fusion of the lumbar spine.

Anterior interbody fusion of the lumbar spine by the extraperitoneal technique was performed in 47 patients with incapacitating low-back pain due to spondylolisthesis (26 patients) or disc degeneration (21 patients). The mean age was 38.2 years.

Replacement with the Christiansen endoprosthesis in acute femoral neck fractures. A 5 year follow-up study.

Patients with acute femoral neck fractures, treated with prosthetic replacement (Christiansen's trunnion bearing endoprosthesis), were followed up at 15 months and again at 67 months postoperatively, and the results of the two examinations have been compared. The patients' personal opinion of the results of the operation did not change between the time of the first and second follow-up examinations. However, the objective results showed a deterioration in function (according to Stinchfield's hip assessment scheme) with increasing follow-up time.

Internal fixation of fractures of the neck of the femur using von Bahr screws and allowing immediated weight bearing: a prospective clinical study.

This article presents the results of von Bahr screw fixation in 103 patients, allowing immediate weight bearing. After a follow-up period of 1 year, a failure rate of 18% was recorded. Analysis of the series shows that the failures are due to inadequate reduction of the displacement during operation, especially when the head is in varus, and to bad positions of the screw.

Treatment of pertrochanteric and subtrochanteric fractures of the femur by the Ender method.

The Ender method consists of insertion of round, flexible, condylocephalic intramedullary nails. In 104 patients with a median age of 77 years and 80% older than 70 years, the morbidity was high (owing to concomitant diseases in 73%). Follow-up examination of survivals showed good functional results.

Internal fixation versus primary prosthetic replacement in acute femoral neck fractures: a prospective, randomized clinical study.

A prospective, randomized clinical study has been performed on 104 patients with an acute femoral neck fracture, comparing internal fixation (von Bahr screws) with primary prosthetic replacement (Christiansen endoprosthesis). Immediate weight bearing was allowed in both groups. The postoperative mortality rate was similar in the two groups.

Interaction between acute gastric ulcer and epinephrine-induced mucosal erosions in the rat: the significance of gastric acid secretion.

Gastric mucosal erosions were produced in rats by pyloric occlusion and intraperitoneal injection of epinephrine. Gastric ulcer was induced by application of acetic acid to a limited area of the stomach. pH, total amount of acid and volume of gastric juice were determined 5 h after pyloric occlusion.

Release of inflammatory mediators into the gastric wall of rats with acute acetic acid induced ulcer.

An acute, acetic acid induced gastric ulcer in rats is associated with increased capillary permeability and albumin leakage into the gastric wall surrounding the ulcer. This is an inflammatory reaction, and the present experiment was undertaken in an attempt to identify inflammatory mediators in the gastric wall around the ulcer. Rats were pretreated with inflammatory antagonists, and the protein leakage was estimated by means of 125I-labelled albumin 40--60 min and 4 h after ulcer induction.

Accelerated healing of gastric ulcer after removal of the greater omentum in rats.

Standardized ulcers were produced in rats by local application of acetic acid to the serosal surface of the stomach. Ulcers induced at the lesser curvature, the greater curvature or the posterior wall were found to be of similar size after 2 and 4 weeks. In a group of animals the greater omentum was excised just before the application of acid.