The foetal skull bone as a biological graft was investigated. This study was conducted on Fifteen adult mixed - breed normal dogs 12 to 24 months with weighing 21.4=3.6 Kg .Dogs were randomly divided into 3 groups of 5 animals each. The foetal skull bone of 45 days old was collected from one pregnant bitch via cesarean method. The right femoral head cartilage was removed completely in all dogs of 3 groups.. Group I acted as control one, whereas in II group, resurfacing was done by using foetal skull bone which was fixed by using 0.8 mm cerclage wire in criss-cross fashion, but in III group, it was done similar to II group and the hip joint additionally was fixed by using 2 mm steinmenn pin.The clinical observations was made accordingly for 60 days in all groups. The gross changes of femoral head in group I & II were quite smooth and slippy, but in III group were uneven and rough due to secondary changes and ankylosis, but on micropscopic interpertation there was a remarkable compatibility of the graft with femoral head.The reconstruction of articular cartilage was faster in group II and even group III animals than group I animals. There was single row of chondrocyte in scatter area of samples in group . The complete and uniform hyaline cartilage in group II and fibro - cartilage and mixture of connective tissues in group III animals were observed. The results indicated that the foetal skull bone due to its pleuripotent calvarium easily can orient itself into the chondrocytes and cartilagenous tissues in articular surface of the hip joint, if there is suitable enviroment before complete ossification,so that normal joint motion could expect