Femoral neck fracture has given marked attention to the orthopaedic surgeon due to complications, such as avascular necrosis of femoral head, non-union and degenerative arthritis, moveover common in older age group since early part of the 20th century. It is one of disabling and unsolved problems, so various techniques and implants were introduced and applied. Percutaneous Knowles pinning is one of simple, safe and reasonably effective method in treating femoral neck fracture, provided it is performed correctly. Nineteen cases of femoral neck fracture treated with precutaneous Knowles pinning at the Department of Orthopaedic Surgery, National Medical Center were analyzed and following result were obtained. l. Among the 19 cases, 13 cases were female and 6 cases were male, and high incidence was noted in older age group. 2. The amout of bleeding during operation was less than 100ml and the operative time was less than one and half hour under the local anesthesia in majority. 3. Good result was obtained in the group of operation less than 3 days after initial injury compared to more than 3 days group. 4. There was high complication rate in poor group than acceptable group according to Garden alignment index and we could predict the end result by aid of alignment index. 5. There was no cast immobilization in case of stable reduction, good fixation and good Rapport. 6. Bony union was established within 4.7 months in non-displaced fracture and 7.3 months in displaced fracture in average. 7. There were 1 case of avascular necrosis. 3 cases of non-union and 2 cases of degenerative osteoarthritis and poor results were correlated with Garden stage.