We studied 16 cases intracapsular pressure in displaced fracture of femoral neck(Garden stage III, IV), the pressures were measured range between 12-62 mmHg(mean, 23.4 mmHg). Aspirated blood amount from hip joint did not exceed 3cc, this amount not correlate with intracaspsular pressure. Of 10 cases examined scintimetry, 2 had incressed uptake after aspiraton, it is suggested that early decompression of hemarthrosis in femur neck fracture regaredless of displacement may be considered.