Pain is generally an unpleasant feeling in response to an event that either damages or can potentially damage the body's tissues. There are four main steps in the process of feeling pain: transduction, transmission, perception, and modulation.[12] The nerve cells that detect pain have cell bodies located in the dorsal root ganglia and fibers that transmit these signals to the spinal cord.[33] The process of pain sensation starts when the pain-causing event triggers the endings of appropriate sensory nerve cells. This type of cell converts the event into an electrical signal by transduction. Several different types of nerve fibers carry out the transmission of the electrical signal from the transducing cell to the posterior horn of spinal cord, from there to the brain stem, and then from the brain stem to the various parts of the brain such as the thalamus and the limbic system. In the brain, the pain signals are processed and given context in the process of pain perception. Through modulation, the brain can modify the sending of further nerve impulses by decreasing or increasing the release of neurotransmitters.[12]
But moving is important for hip and knee OA. It causes your joints to compress and release, bringing blood flow, nutrients, and oxygen into the cartilage. “This can help prolong the function and longevity of your joints,” says Eric Robertson, DPT, a physical therapist and associate professor of clinical physical therapy at the University of Southern California.
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^{Lie on your back with your knees bent and feet flat on the floor. Place left ankle right below right knee, creating a “four” shape with left leg. Thread left arm through the opening you created with left leg and clasp hands behind right knee. Lift right foot off floor and pull right knee toward chest, flexing left foot. Hold for 30 seconds, then repeat on opposite side.}
2016 — More editing, more! Added some better information about pain being a poor indicator, and the role of myofascial trigger points. This article has become extremely busy in the last couple months — about 4,000 readers per day, as described here — so I am really polishing it and making sure that it’s the best possible answer to people’s fears about back pain.
^{Low back pain has been with humans since at least the Bronze Age. The oldest known surgical treatise – the Edwin Smith Papyrus, dating to about 1500 BCE – describes a diagnostic test and treatment for a vertebral sprain. Hippocrates (c. 460 BCE – c. 370 BCE) was the first to use a term for sciatic pain and low back pain; Galen (active mid to late second century CE) described the concept in some detail. Physicians through the end of the first millennium did not attempt back surgery and recommended watchful waiting. Through the Medieval period, folk medicine practitioners provided treatments for back pain based on the belief that it was caused by spirits.[99]
^ Jump up to: a b c Furlan AD, Yazdi F, Tsertsvadze A, Gross A, Van Tulder M, Santaguida L, Gagnier J, Ammendolia C, Dryden T, Doucette S, Skidmore B, Daniel R, Ostermann T, Tsouros S (2012). "A systematic review and meta-analysis of efficacy, cost-effectiveness, and safety of selected complementary and alternative medicine for neck and low-back pain". Evidence-Based Complementary and Alternative Medicine. 2012: 1–61. doi:10.1155/2012/953139. PMC 3236015. PMID 22203884.}
Note: Exercises that strengthen the hip flexors also involve contracting (shortening) these muscles. So if tight hip flexors are a problem for you, it might be wise to limit how many direct hip-strengthening exercises you perform. These exercises are more geared toward people who have been told they have weak hip flexors that need strengthening or are looking for targeted exercises to build more power and stamina in the hip flexors.
Bone scans are used to detect and monitor infection, fracture, or disorders in the bone. A small amount of radioactive material is injected into the bloodstream and will collect in the bones, particularly in areas with some abnormality. Scanner-generated images can be used to identify specific areas of irregular bone metabolism or abnormal blood flow, as well as to measure levels of joint disease.
If you have arthritis or bursitis, you’ve probably noticed that exercise can actually help relieve your pain. But when is hip pain a sign that you should stop exercising or doing a certain activity? If your hip starts to hurt during a particular exercise and lingers for hours or days afterward, that’s a sign that your joint needs to rest, notes Humphrey. It’s normal to feel some soreness the day after exercising, but the pain shouldn’t persist or become worse. Also, if you experience a sharp or shooting pain, stop the activity immediately and talk to your doctor or physical therapist.
Why is back pain still a huge problem? Maybe this: “It is extremely difficult to alter the potentially disabling belief among the lay public that low back pain has a structural mechanical cause. An important reason for this is that this belief continues to be regularly reinforced by the conditions of care of a range of ‘hands-on’ providers, for whom idiosyncratic variations of that view are fundamental to their professional existence.”