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	<title>Learn Bones Anatomy</title>
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	<link>http://www.learnbones.com</link>
	<description>Learn about the anatomy of the bones of the human body skeleton.</description>
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		<title>Osteopetroses</title>
		<link>http://www.learnbones.com/osteopetroses</link>
		<comments>http://www.learnbones.com/osteopetroses#comments</comments>
		<pubDate>Thu, 17 May 2012 08:13:03 +0000</pubDate>
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				<category><![CDATA[Osteopetroses]]></category>

		<guid isPermaLink="false">http://www.learnbones.com/?p=124</guid>
		<description><![CDATA[Osteopetroses is a disease that causes the density of bones in the body to increase over time. In a healthy bone, old cells will be recycled at the same rate as new cells are created, thereby keeping the total amount constant. However, in patients with osteopetroses, the old cells are not recycled at a sufficiently [...]]]></description>
			<content:encoded><![CDATA[<p>Osteopetroses is a disease that causes the density of bones in the body to increase over time. In a healthy bone, old cells will be recycled at the same rate as new cells are created, thereby keeping the total amount constant. However, in patients with osteopetroses, the old cells are not recycled at a sufficiently high rate (or not at all). The disease affects patients of all ages, and if it occurs during early childhood it can impair and even permanently damage bone structure, and in severe cases can result in death.</p>
<p>Furthermore, as the bone density increases, fracture and other injuries will become more likely as the bone becomes stiffer. If the bone formation is affected to a great enough degree, it will physically impinge upon the bone marrow and hence impair the formation of blood cells. This can then cause further complications, in the form of bleeding and anemia.</p>
<p>If osteopetroses occurs in the skull, the bone can begin to apply pressure on the brain, which can result in neurological damage and deformation of the face, and possible vision impairment or blindness. In these cases, neurosurgery is sometimes required to relieve the pressure on the brain, and repair existing damage.</p>
<p>Usually x-rays are sufficient in diagnosing osteopetroses, in addition with an assessment of the symptoms described by the patient, and the physical appearance of the bones in question. There is no way to cure a patient with osteopetroses, but there are a number of treatments available to ameliorate the symptoms, such as corticosteroids which have been known to expedite the rate at which old bone cells are recycled.</p>
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		<title>Osteonecrosis Causes</title>
		<link>http://www.learnbones.com/osteonecrosis-causes</link>
		<comments>http://www.learnbones.com/osteonecrosis-causes#comments</comments>
		<pubDate>Tue, 15 May 2012 10:45:43 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Osteonecrosis]]></category>

		<guid isPermaLink="false">http://www.learnbones.com/?p=122</guid>
		<description><![CDATA[Osteonecrosis, otherwise known as avascular necrosis, is a condition that causes restricted blood supply to bones, resulting in premature death of cells. The ailment most commonly affects the coxa (hip) and scapula (shoulder), but is also seen in the patella (knee joint), ginglymus (elbow), carpus (wrist) and talocrural joint (ankle). If osteonecrosis is not treated, [...]]]></description>
			<content:encoded><![CDATA[<p>Osteonecrosis, otherwise known as avascular necrosis, is a condition that causes restricted blood supply to bones, resulting in premature death of cells. The ailment most commonly affects the coxa (hip) and scapula (shoulder), but is also seen in the patella (knee joint), ginglymus (elbow), carpus (wrist) and talocrural joint (ankle).</p>
<p>If osteonecrosis is not treated, the lack of blood flow to the bone will result in deterioration of bone matter, leading to arthritis and possible collapse. Osteonecrosis can have several causes, such as various bone diseases, overuse of anabolic steroids, alcohol abuse, ineffective pressure recovery from deep-sea diving, dislocation and fracture. Some other non bone-related diseases have also been known to cause or exacerbate osteonecrosis, such as diabetes and gout. In rare cases osteonecrosis can occur without any traceable cause – in which case it is labelled “idiopathic osteonecrosis”.</p>
<p>Osteonecrosis is notoriously difficult to detect in its early stages, as the condition is not associated with any pain or external symptoms until the damage has worsened to a significant degree. At later stages, osteonecrosis will result in ever-increasing pain, which may become extremely difficult to manage in case of collapse. The disease can also result in limited maneuverability in the affected joints, and it can permanently affect the gait of a patient if the damage to the hip or knee is sufficient. Osteonecrosis is effectively impossible to prevent, as its causes are so varied and the progression of the disease is so poorly understood. Patients who wish to minimize the risk of osteonecrosis developing later in life can do so by avoiding over-use of steroids and alcohol, and taking care to follow correct decompression techniques after deep-sea diving.</p>
<p>Your physician may suggest one or more scans to determine the extent of the disease, such as CT, MR, bone scans and x-days. The treatment for osteonecrosis varies depending on the condition that caused the disease to begin with. In the majority of cases, patients with osteonecrosis will need to undergo surgery in order to excise the dead bone tissue and prevent further damage. The effectiveness of surgery varies greatly depending on the age, gender, weight and overall lifestyle and medical history of the patient in question. The disease can be eradicated entirely or it can result in permanent damage.</p>
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		<title>Enchondroma</title>
		<link>http://www.learnbones.com/enchondroma</link>
		<comments>http://www.learnbones.com/enchondroma#comments</comments>
		<pubDate>Fri, 11 May 2012 16:59:23 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Enchondroma]]></category>

		<guid isPermaLink="false">http://www.learnbones.com/?p=121</guid>
		<description><![CDATA[Enchondroma is a type of tumor that affects cartilage in the body’s extremities and most often affects teenagers. The tumor is usually benign and can sometimes remain throughout the life of the patient without adverse effects. However, it is possible that an enchondroma can become malignant, and this transition is notoriously difficult to diagnose – [...]]]></description>
			<content:encoded><![CDATA[<p>Enchondroma is a type of tumor that affects cartilage in the body’s extremities and most often affects teenagers. The tumor is usually benign and can sometimes remain throughout the life of the patient without adverse effects. However, it is possible that an enchondroma can become malignant, and this transition is notoriously difficult to diagnose – even for experts using state-of-the-art equipment.</p>
<p>Enchondroma is not caused by environmental factors, and most physicians believe the cause of the disease lies in the genes of the patients. The benign tumors can remain undetected for many years, as the symptoms do not include any pain. This is why the disease is most often diagnosed after an x-ray is taken for other purposes. An x-ray is usually sufficient in order to correctly identify the disease. However, sometimes additional imaging techniques, such as computer tomography (CT), magnetic resonance (MR) and bone scans can be useful in determining the best course of action.</p>
<p>It is important to diagnose the disease correctly and differentiate between the benign and malignant variety. The malignant version of enchondroma (chondrosarcoma) is often associated with a degree of pain. It is particularly important to draw a distinction between pain that is experienced at rest or during movement. Pain that is present without movement is more serious, as it implies a later stage of chondrosarcoma.</p>
<p>If left untreated enchondroma can cause distortions in the bone structure of the hands and feet, as well as a propensity for fracture and injury. The best type of treatment is debatable, and can vary greatly among physicians. Sometimes, small and benign tumors do not need to be surgically removed, as they are unlikely to cause deformation or further complications. However, when the tumor is sufficiently aggressive to cause frequent fractures, they are usually excised in order to prevent further injury. The general consensus amongst bone surgeons is that biopsies cause more problems than they solve in the diagnosis of enchondroma. This is because it is notoriously difficult to differentiate between benign and malignant tumors from a biopsy. Furthermore, the removal of a sample via biopsy can drag cancerous tissue across healthy tissue, causing contamination.</p>
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		<title>Craniosynostosis</title>
		<link>http://www.learnbones.com/craniosynostosis</link>
		<comments>http://www.learnbones.com/craniosynostosis#comments</comments>
		<pubDate>Mon, 07 May 2012 21:50:31 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Craniosynostosis]]></category>

		<guid isPermaLink="false">http://www.learnbones.com/?p=119</guid>
		<description><![CDATA[Craniosynostosis is a disease that affects the growth of infant cranial structures, causing permanent disfigurement. The disease prematurely fuses sutures (joints) in the skull, thereby preventing growth in certain directions. This results in abnormal growth patterns, which can have serious effects on the shape of the head and facial features, and in severe cases on [...]]]></description>
			<content:encoded><![CDATA[<p>Craniosynostosis is a disease that affects the growth of infant cranial structures, causing permanent disfigurement. The disease prematurely fuses sutures (joints) in the skull, thereby preventing growth in certain directions. This results in abnormal growth patterns, which can have serious effects on the shape of the head and facial features, and in severe cases on the development of the brain. The limitations on the growth of the cranium in specific directions results in compensatory growth in the allowed directions, i.e. the head will grow more in the unrestricted directions in an attempt to allow sufficient space for brain growth. However, this is not always successful and the growth restrictions caused by Craniosynostosis are sometimes so severe that they cause permanent eye damage and reduced intelligence and mental ability.</p>
<p>Craniosynostosis affects around 0.05% of new borns, approximately 10% of which suffer from Complex Craniosynostosis – in which more than one suture is affected. Some studies have found that a restriction on space inside the womb is a significant factor in future cranial bone growth. Furthermore, smoking and the use of recreational drugs during pregnancy increase the risk of the child developing Craniosynostosis. The disease also has a strong hereditary factor, with 8% of the children affected having parents with the same condition.</p>
<p>Surgery is currently the only treatment option available for patients suffering from Craniosynostosis. The aim of surgical intervention is to remove as many restrictions on the growth of the cranium as possible. This is done by excising the defective sutures and repairing the damage from any uneven growth that has already taken place. In order to minimize deformity, the surgery should take place as soon as the disease has been diagnosed, ideally when the child is only a few months old. At this stage the cranium is still flexible and can be remoulded by the surgeons. The older the child gets, the more inelastic and fragile the bone becomes, rendering the surgery more complicated and dangerous.</p>
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		<title>Osteoporosis</title>
		<link>http://www.learnbones.com/osteoporosis</link>
		<comments>http://www.learnbones.com/osteoporosis#comments</comments>
		<pubDate>Thu, 03 May 2012 21:12:27 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Osteoporosis]]></category>

		<guid isPermaLink="false">http://www.learnbones.com/?p=118</guid>
		<description><![CDATA[Osteoporosis is a disease that is most commonly associated with the elderly, and is more prevalent in women than in men. Symptoms include the gradual deterioration of the skeletal structure, which is why older people are more likely to fracture bones. It is often difficult to prevent osteoporosis, as the decrease in bone is not [...]]]></description>
			<content:encoded><![CDATA[<p>Osteoporosis is a disease that is most commonly associated with the elderly, and is more prevalent in women than in men. Symptoms include the gradual deterioration of the skeletal structure, which is why older people are more likely to fracture bones.</p>
<p>It is often difficult to prevent osteoporosis, as the decrease in bone is not associated with any discomfort or external symptoms. The presence of the disease often remains undetected until the patient is examined after a fracture has occurred. Older people are most likely to injure or fracture their hips during falls, particularly around the house. These hip fractures can often cause irreversible damage, paralysis and even death from related complications.</p>
<p>Regular x-rays are often not efficient in imaging the signs of osteoporosis at an advanced stage of skeletal decay. A relatively new form of imaging technology, known as Dual Energy X-ray Absorptiometry (DXA), is much more effective as an early diagnostics tool, as it is able to detect early warning signs prior to fracture.</p>
<p>One of the most difficult aspects of the disease is that one fracture often leads to further weakening of the bone and subsequently more severe fractures.</p>
<p>Genetics contribute greatly to whether an individual will develop osteoporosis and at what age the deterioration in skeletal structure first sets in. In addition to genetics, smoking, diet and exercise have a great influence on the severity of the disease. Weight lifting in particular has shown to be an effective way of slowing down bone deterioration. Sufficient vitamin D from sunlight and calcium from dairy products are an effective way of combating the development of osteoporosis. The loss of skeletal strength in women is linked to the post-menopausal decrease in oestrogen. In addition to prevention, some effective treatment options have recently become available for patients suffering from osteoporosis. These medications are able to prevent further deterioration and even restore skeletal mass in some cases.</p>
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		<title>Rickets Disease in Children</title>
		<link>http://www.learnbones.com/rickets-disease-in-children</link>
		<comments>http://www.learnbones.com/rickets-disease-in-children#comments</comments>
		<pubDate>Mon, 30 Apr 2012 17:10:19 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Rickets]]></category>

		<guid isPermaLink="false">http://www.learnbones.com/?p=117</guid>
		<description><![CDATA[Rickets is a disease that is most commonly associated with early childhood. One positive aspect of Rickets is that it is preventable &#8211; with a sufficient supply of vitamin D, e.g. through exposure to sunlight. A healthy and balanced diet is also important in the prevention of Rickets. Rickets affects the bone structure, and in [...]]]></description>
			<content:encoded><![CDATA[<p>Rickets is a disease that is most commonly associated with early childhood. One positive aspect of Rickets is that it is preventable &#8211; with a sufficient supply of vitamin D, e.g. through exposure to sunlight. A healthy and balanced diet is also important in the prevention of Rickets.</p>
<p>Rickets affects the bone structure, and in severe cases can cause permanent damage if left untreated. The disease renders the bones more fragile and thus more susceptible to breaks and fractures. Rickets has also been known to cause aches and pains in muscles. In certain cases Rickets will be caused by other medical conditions, especially those that affect the liver, digestive system and kidneys. Rickets can result in stunted or slowed growth if left untreated, in addition to malformed spines, breastbones and legs.</p>
<p>There is strong evidence that Rickets has hereditary traits, with the child being more likely to develop symptoms if the mother shows signs of vitamin D deficiency. The mother is more likely to cause a vitamin D deficiency in the infant if she breast feeds without a supplement.</p>
<p>Seeing as Rickets is caused by a lack of vitamin D, children with darker skin will be more likely to be affected by it. This is because the darker the skin, the less efficient it is at converting sunlight to vitamin D.</p>
<p>There is a very high awareness of skin cancer risks in children. This has resulted in parents using an excessive amount of sun cream on their children. This in turn has caused an increase in Rickets, as the skin is being blocked from receiving the required amount of sunlight to create vitamin D. A correlation between the over-use of sunblock and Rickets was discovered in Australia, where light-skinned people are (justifiably) concerned about the high levels of ultraviolet radiation. Although it is prudent to protect the skin from the sun, some moderation in sunblock usage is required, as the skin needs some exposure to natural light.</p>
<p>The positive aspect of Rickets is that the symptoms abate very rapidly after an increase in the intake of vitamin D. Furthermore, irregularities in bone development will also usually disappear with time, unless the disease remains untreated throughout puberty.</p>
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