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d the chondrocytes die this converts each column into a longitudinal channel which is immediately invaded by blood vessels and marrow from the marrow cavity osteoblasts line up along the walls of these channels and begin depositing concentric lamellae of matrix while osteoclasts dissolve the temporarily calcified cartilage 64 bone development in youth plays a role in preventing future complications of the skeletal system regular exercise during childhood and adolescence can help improve bone architecture making bones more resilient and less prone to fractures in adulthood physical activity specifically resistance training stimulates growth of bones by increasing both bone density and strength studies have shown a positive correlation between the adaptations of resistance training and bone density 65 while nutritional and pharmacological approaches may also improve bone health the strength and balance adaptations from resistance training are a substantial added benefit 65 weight bearing exercise may assist in osteoblast bone forming cells formation and help to increase bone mineral content high impact sports which involve quick changes in direction jumping and running are particularly effective with stimulating bone growth in the youth 66 sports such as soccer basketball and tennis have shown to have positive effects on bone mineral density as well as bone mineral content in teenagers 66 engaging in physical activity during childhood years particularly in these high impact osteogenic sports can help to positively influence bone mineral density in adulthood 67 children and adolescents who participate in regular physical activity will place the groundwork for bone health later in life reducing the risk of bone related conditions such as osteoporosis 67 remodeling edit main article bone remodeling bone is constantly being created and replaced in a process known as remodeling this ongoing turnover of bone is a process of resorption followed by replacement of bone with little change in shape this is accomplished through osteoblasts and osteoclasts cells are stimulated by a variety of signals and together referred to as a remodeling unit approximately 10 of the skeletal mass of an adult is remodelled each year 68 the purpose of remodeling is to regulate calcium homeostasis repair microdamaged bones from everyday stress and to shape the skeleton during growth 69 repeated stress such as weight bearing exercise or bone healing results in the bone thickening at the points of maximum stress wolff s law it has been hypothesized that this is a result of bone s piezoelectric properties which cause bone to generate small electrical potentials under stress 70 the action of osteoblasts and osteoclasts are controlled by a number of chemical enzymes that either promote or inhibit the activity of the bone remodeling cells controlling the rate at which bone is made destroyed or changed in shape the cells also use paracrine signalling to control the activity of each other 26 71 for example the rate at which osteoclasts resorb bone is inhibited by calcitonin and osteoprotegerin calcitonin is produced by parafollicular cells in the thyroid gland and can bind to receptors on osteoclasts to directly inhibit osteoclast activity osteoprotegerin is secreted by osteoblasts and is able to bind rank l inhibiting osteoclast stimulation 72 osteoblasts can also be stimulated to increase bone mass through increased secretion of osteoid and by inhibiting the ability of osteoclasts to break down osseous tissue citation needed increased secretion of osteoid is stimulated by the secretion of growth hormone by the pituitary thyroid hormone and the sex hormones estrogens and androgens these hormones also promote increased secretion of osteoprotegerin 72 osteoblasts can also be induced to secrete a number of cytokines that promote reabsorption of bone by stimulating osteoclast activity and differentiation from progenitor cells vitamin d parathyroid hormone and stimulation from osteocytes induce osteoblasts to increase secretion of rank ligand and interleukin 6 which cytokines then stimulate increased reabsorption of bone by osteoclasts these same compounds also increase secretion of macrophage colony stimulating factor by osteoblasts which promotes the differentiation of progenitor cells into osteoclasts and decrease secretion of osteoprotegerin citation needed volume edit bone volume is determined by the rates of bone formation and bone resorption certain growth factors may work to locally alter bone formation by increasing osteoblast activity numerous bone derived growth factors have been isolated and classified via bone cultures these factors include insulin like growth factors i and ii transforming growth factor beta fibroblast growth factor platelet derived growth factor and bone morphogenetic proteins 73 evidence suggests that bone cells produce growth factors for extracellular storage in the bone matrix the release of these growth factors from the bone matrix could cause the proliferation of osteoblast precursors essentially bone growth factors may act as potential determinants of local bone formation 73 cancellous bone volume in postmenopausal osteoporosis may be determined by the relationship between the total bone forming surface and the percent of surface resorption 74 clinical significance edit see also bone disease a number of diseases can affect bone including arthritis fractures infections osteoporosis and tumors conditions relating to bone can be managed by a variety of doctors including rheumatologists for joints and orthopedic surgeons who may conduct surgery to fix broken bones other doctors such as rehabilitation specialists may be involved in recovery radiologists in interpreting the findings on imaging and pathologists in investigating the cause of the disease and family doctors may play a role in preventing complications of bone disease such as osteoporosis when a doctor sees a patient a history and exam will be taken bones are then often imaged called radiography this might include ultrasound x ray ct scan mri scan and other imaging such as a bone scan which may be used to investigate cancer 75 other tests such as a blood test for autoimmune markers may be taken or a synovial fluid aspirate may be taken 75 fractures edit radiography used to identify possible bone fractures after a knee injury main article bone fracture in normal bone fractures occur when there is significant force applied or repetitive trauma over a long time fractures can also occur when a bone is weakened such as with osteoporosis or when there is a structural problem such as when the bone remodels excessively such as paget s disease or is the site of the growth of cancer 76 common fractures include wrist fractures and hip fractures associated with osteoporosis vertebral fractures associated with high energy trauma and cancer and fractures of long bones not all fractures are painful 76 when serious depending on the fractures type and location complications may include flail chest compartment syndromes or fat embolism compound fractures involve the bone s penetration through the skin some complex fractures can be treated by the use of bone grafting procedures that replace missing bone portions fractures and their underlying causes can be investigated by x rays ct scans and mris 76 fractures are described by their location and shape and several classification systems exist depending on the location of the fracture a common long bone fracture in children is a salter harris fracture 77 when fractures are managed pain relief is often given and the fractured area is often immobilised this is to promote bone healing in addition surgical measures such as internal fixation may be used because of the immobilisation people with fractures are often advised to undergo rehabilitation 76 tumors edit main article bone tumor tumor that can affect bone in several ways examples of benign bone tumors include osteoma osteoid osteoma osteochondroma osteoblastoma enchondroma giant cell tumor of bone and aneurysmal bone cyst 78 cancer edit main article bone metastases cancer can arise in bone tissue and bones are also a common site for other cancers to spread metastasise to 79 cancers that arise in bone are called primary cancers although such cancers are rare 79 metastases within bone are secondary cancers with the most common being breast cancer lung cancer prostate cancer thyroid cancer and kidney cancer 79 secondary cancers that affect bone can either destroy bone called a lytic cancer or create bone a sclerotic cancer cancers of the bone marrow inside the bone can also affect bone tissue examples including leukemia and multiple myeloma bone may also be affected by cancers in other parts of the body cancers in other parts of the body may release parathyroid hormone or parathyroid hormone related peptide this increases bone reabsorption and can lead to bone fractures bone tissue that is destroyed or altered as a result of cancers is distorted weakened and more prone to fracture this may lead to compression of the spinal cord destruction of the marrow resulting in bruising bleeding and immunosuppression and is one cause of bone pain if the cancer is metastatic then there might be other symptoms depending on the site of the original cancer some bone cancers can also be felt cancers of the bone are managed according to their type their stage prognosis and what symptoms they cause many primary cancers of bone are treated with radiotherapy cancers of bone marrow may be treated with chemotherapy and other forms of targeted therapy such as immunotherapy may be used 80 palliative care which focuses on maximising a person s quality of life may play a role in management particularly if the likelihood of survival within five years is poor 81 diabetes edit type 1 diabetes is an autoimmune disease in which the body attacks the insulin producing pancreas cells causing the body to not make enough insulin 82 in contrast type 2 diabetes in which the body creates enough insulin but becomes resistant to it over time 82 children makeup approximately 85 of type 1 diabetes cases and in america there was an average 22 rise in cases 83 over the first 24 months of the covid 19 pandemic with the increase of developing some form of diabetes across all ranges continually growing the health impacts on bone development and bone health in these populations are still being researched most evidence suggests that diabetes either type 1 and type 2 inhibits osteoblastic activity 84 and causes both lower bmd and bmc in both adults and children the weakening of these developmental aspects is thought to lead to an increased risk of developing many diseases such as osteoarthritis osteoporosis osteopenia and fractures 85 development of any of these diseases is thought to be correlated with a decrease in ability to perform in athletic environments and activities of daily living focusing on therapies that target molecules like osteocalcin or ages could provide new ways to improve bone health and help manage the complications of diabetes more effectively 86 other painful conditions edit osteomyelitis is inflammation of the bone or bone marrow due to bacterial infection 87 osteomalacia is a painful softening of adult bone caused by severe vitamin d deficiency 88 osteogenesis imperfecta 89 osteochondritis dissecans 90 ankylosing spondylitis 91 skeletal fluorosis is a bone disease caused by an excessive accumulation of fluoride in the bones in advanced cases skeletal fluorosis damages bones and joints and is painful 92 osteoporosis edit main article osteoporosis reduced bone mineral density in osteoporosis r increasing the likelihood of fractures osteoporosis is a disease of bone where there is reduced bone mineral density increasing the likelihood of fractures 93 osteoporosis is defined in women by the world health organization as a bone mineral density of 2 5 standard deviations below peak bone mass relative to the age and sex matched average this density is measured using dual energy x ray absorptiometry dexa with the term established osteoporosis including the presence of a fragility fracture 94 osteoporosis is most common in women after menopause when it is called postmenopausal osteoporosis but may develop in men and premenopausal women in the presence of particular hormonal disorders and other chronic diseases or as a result of smoking and medications specifically glucocorticoids 93 osteoporosis usually has no symptoms until a fracture occurs 93 for this reason dexa scans are often done in people with one or more risk factors who have developed osteoporosis and are at risk of fracture 93 one of the most important risk factors for osteoporosis is advanced age accumulation of oxidative dna damage in osteoblastic and osteoclastic cells appears to be a key factor in age related osteoporosis 95 osteoporosis treatment includes advice to stop smoking decrease alcohol consumption exercise regularly and have a healthy diet calcium and trace mineral supplements may also be advised as may vitamin d when medication is used it may include bisphosphonates strontium ranelate and hormone replacement therapy 96 bone health edit main article bone health without strong healthy bones humans are more at risk for different chronic diseases and fractures with day to day function being more difficult with poor bone health it is estimated that diet and exercise during childhood can impact peak bone mass as an adult nearly 20 40 97 one study done on children with developmental coordination disorder found an increase in bone mass up to 4 and 5 in the cortical areas of the tibia alone from a 13 week training period 98 peak bone mass occurs between the second and third decade of most people s lives 99 studies have shown that increasing calcium stores in childhood via food intake result in significant improvements in bone mass density and overall health even into adulthood 100 101 102 osteology edit human femurs and humerus from roman period with evidence of healed fractures the study of bones and teeth is referred to as osteology it is frequently used in anthropology archeology and forensic science for a variety of tasks this can include determining the sex health age ancestry or injury status of the individual the bones were taken from 103 preparing fleshed bones for these types of studies can involve the process of maceration 104 anthropologists and archeologists also study bone tools made by homo sapiens and homo neanderthalensis 105 other animals edit main articles bird anatomy and exoskeleton skeletal fluorosis in a cow s leg due to industrial contamination leg and pelvic girdle bones of bird bird skeletons are very lightweight their bones are smaller and thinner than those of mammals to aid flight among mammals bats come closest to birds in terms of bone density suggesting that small dense bones are a flight adaptation many bird bones have litt...