Injectable calcium phosphate bone cement (CPC) has been used to augment the remaining metaphyseal defect after fracture reduction including DRF, specially in osteoporotic old patients. The purpose of this randomized, prospective study was to investigate that additional CPC augmentation has any benefit over volar locking plate fixation in unstable DRF patient who is older than 65. The null hypothesis is that there is no difference of wrist functional outcomes, radiographic outcomes, and complications between treatment of volar locking plate alone and calcium phosphate bone cement as well as volar locking plate in unstable DRF patient who is older than 65.