It is estimated that one in ten people will have a kidney stone at some time in their lives. The prevalence of kidney stones in the United States increased from 3.8% in the late 1970s to 8.8% in the late 2000s. This increase was seen in both men and women, and both whites and blacks.The lifetime risk of kidney stones is about 19% in men and 9% in women. In men, the first episode is most likely to occur after age 30, but it can occur earlier.t is estimated that one in ten people will have a kidney stone at some time in their lives. The prevalence of kidney stones in the United States increased from 3.8% in the late 1970s to 8.8% in the late 2000s. This increase was seen in both men and women, and both whites and blacks.
Compact bone is found wrapped around the cancellous bone to protect it and is made up of osteons. These osteons are cells composed of delicate layers of lammelae which protect the nerves and blood of the inner core compact bone. On death osteons transform into lammelae and produces barrier between osteon cells located inside the compact bone matrix. Due to this the strength and density of compact bones builds up.
Compact bone consists of closely packed osteons or haversian systems. The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix.Between the rings of matrix, the bone cells (osteocytes) are located in spaces called lacunae.here are two types of bone tissue: compact and spongy. The names imply that the two types differ in density, or how tightly the tissue is packed together. There are three types of cells that contribute to bone homeostasis.