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Bone pain

From Wikipedia, the free encyclopedia

Bone pain (also known medically by several other names) is pain coming from a bone, and is caused by damaging stimuli. It occurs as a result of a wide range of diseases or physical conditions or both, and may severely impair the quality of life.[1]

Bone pain belongs to the class of deep somatic pain, often experienced as a dull pain that cannot be localized accurately by the patient. This is in contrast with the pain which is mediated by superficial receptors in, e.g., the skin. Bone pain can have several possible causes ranging from extensive physical stress to serious diseases such as cancer.[2][3]

For many years[when?], it has been known that bones are innervated with sensory neurons, yet their exact anatomy remained obscure due to the contrasting physical properties of bone and neural tissue.[4] More recently,[when?] it is becoming clear what types of nerves innervated which sections of bone.[5][6] The periosteal layer (an outer membrane) of bone tissue is highly pain-sensitive and an important source of pain in several disease conditions causing bone pain, like fractures, osteoarthritis, etc. However, in certain diseases, the endosteal and haversian nerve supply seems to play an important role, e.g. in osteomalacia, osteonecrosis, and other bone diseases.[citation needed] Thus, there are several types of bone pain, each with many potential sources or origins of cause.


A number of diseases can cause bone pain, including the following:

Causes in children[edit]

Common causes of bone and joint pain in adults, such as osteoarthritis and gouty arthritis are rare in children, as these diseases are a sequelae of chronic wear and tear for several years.


Pain caused by cancer within bones is one of the most severe forms of pain. Because of its severity and uniqueness with respect to other forms of pain, it is extensively researched. According to studies of bone cancer in mouse femur models, it has been determined that bone pain related to cancer occurs as a result of destruction of bone tissue. Chemical changes that occur within the spinal cord as a result of bone destruction give further insight into the mechanism of bone pain.[1]

Metastatic cancer cells often establish themselves within the skeleton. When the cancer cells have metastasized, the mechanical dynamics of the bone matrix become weaker as skeletal strength decreases. This leads to several other complications throughout the body, including pain, thus decreasing the patient's quality of life.[17]

Bone tumors are composed of a conglomeration of cell types, including cancer and immune system cells. Often, tumor cells secrete growth factors that activate receptors close to primary afferent neurons. Activation of these neural receptors is a contributing factor to pain sensation. Additionally, inflammatory lipids called prostaglandins, which are produced at high rates by cancer cells within tumors, activate nociceptors when they bind together.[3]


Stimulation of specialized pain-sensitive nerve fibers (nociceptors) that innervate bone tissue leads to the sensation of bone pain. Bone pain originates from both the periosteum and the bone marrow which relay nociceptive signals to the brain creating the sensation of pain. Bone tissue is innervated by both myelinated (A beta and A delta fiber) and unmyelinated (C fiber) sensory neurons. In combination, they can provide an initial burst of pain, initiated by the faster myelinated fibers, followed by a slower and longer-lasting dull pain initiated by unmyelinated fibers.[3][5]

Nociceptors responsible for bone pain can be activated via several mechanisms including deterioration of surrounding tissue, bone destruction,[1] and physical stress which shears the bone, vascular, muscle, and nervous tissue.


The use of anesthetics within the actual bone has been a common treatment for several years. This method provides a direct approach using analgesics to relieve pain sensations.[4]

Another commonly used method for treating bone pain is radiotherapy, which can be safely administered in low doses. Radiotherapy utilizes radioactive isotopes and other atomic particles to damage the DNA in cells, thus leading to cell death. By targeting cancer tumors, radiotherapy can lead to decrease in tumor size and even tumor destruction.[18] A form of radiotherapy that is often used in cases of bone cancer is systemic radioisotope therapy, where the radioisotopes target sections of the bone specifically undergoing metastasis.

In the case of bone fractures, surgical treatment is generally the most effective. Analgesics can be used in conjunction with surgery to help ease pain of damaged bone.[18]


Mouse and other animal models are being heavily used to determine the neuron tissue densities in bone[5] and mechanisms for maintenance of bone pain.[1] This information is pertinent to determining the biological and physiological components of pain in the bone. By creating a detailed map relating the types of nerves going through the different sections of bone, it is possible to pin-point locations in the bone that are at a higher risk of being susceptible to bone pain.[citation needed]

Treatments focusing on biological components such as cannabinoid receptors are being tested for effectiveness. Through testing in mouse models, it has been shown that activation of the CB-1 receptor helps reduce reactions associated with acute pain, indicating that it alleviates bone pain. Thus, a new target for potential treatments is activation of the CB-1 receptor.[19]

Modern research and techniques are attempting to provide longer-lasting and more effective methods of treating bone pain by developing and applying new physiological knowledge of nervous tissue within the bone. If thorough understanding of the intra-neuronal mechanisms relating to pain can be developed, then new and more effective treatment options can be created and tested. Thus, it is critical to fully understand the mechanism which dictates bone pain.[citation needed]


Bone pain is also known by the following names:

Name Pronunciation Derivation
ostalgia /ɒstˈælə/ ost- + -algia
ostealgia /ɒstiˈælə/ oste- + -algia
osteodynia /ɒstiˈdɪniə/ osteo- + -dynia


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