Femoral neck fracture is more common in elderly even by minor trauma because of osteoporosis. In young adults, though the incidence is low, have a poor prognosis because of high incidence of non-union and aseptic necrosis. The treatment method of the femur neck fracture is widely divided into internal fination and replacelnent arthroplasty But there is still contrversies present in the treatment methods.

The object of this study is to observe the relationships between the clinical outcomes and the age, the degree of displacement. the type of reduction, the time of operation and the bone density in the femoral neck fractures treated with mulliple Knowles pin fitation.

The authors analyzed 29 cases of femoral neck fractures in adults under 60 years of age, who were treated with multiple pih (ixation and followed up more than 1 yearduration

The results obtained were as follows;

1. The union of femoral neck fracture occured in 19 cases(65.5%) among the 19 cases and the mean duration of union was 4.8 months.

2. The complications were 8 cases(21.6%) of avascular necrosis, 2 cases(6.9%) of non-union, 2 cases of malunion and 1 case of post-traumatic arthritis.

3. The functional results by Lunceford criteria were satisfactory in 17 cases (58.6%).

4. In the patient group which were no avascular necrosis and non-union showed 89.5% of satisfactory functional end result.

5. There was a relationship between the complications such as avascular necrosis and non-union, and age of the patient, bone density, degree of initial displacement and type of reduction. But the duration between the injury and operation did not influence the complication rate.

According to the above results, we concluded that multiple Knowles pin fination in femoral neck fracture is simple and safe method, and one of salvaging method of femoral head in adults under 60 years of age.