The problem is that these muscles aren't designed to be prime movers—they're designed to support the action of the glutes. Inability of activating the glutes can result in low back pain (low back muscles compensating), hamstring strains (overacting hamstrings), hip pain (resulting from hamstring-dominant hip extension) and knee pain (poor glute medius strength).

If low back pain gets worse or does not improve after two to three days of home treatment, contact a primary-care physician. The physician can evaluate the patient and perform a neurological exam in the office to determine which nerve root is being irritated, as well as rule out other serious medical conditions. If there are clear signs that the nerve root is being compressed, a physician can prescribe medications to relieve the pain, swelling and irritation; he or she also may recommend limitation of activities. If these treatment options do not provide relief within two weeks, it may be time to consider other diagnostic studies and possibly surgery.
The treatment of hip pain depends on the precise cause of the pain. Treatments can include rest, non-weight-bearing, cold application, and anti-inflammatory medications. For local inflammation, sometimes injection of cortisone medication (steroids) is used to quiet the inflammation. If infection is present, antibiotics are used. Fractures can require treatment with surgical repairs, including pinning, plates and screws, and total joint replacement. For severe arthritis, total joint replacement is performed when possible.
Apply the above concept to your hips. When you sit, your hips are in a "flexed" position. Therefore, the muscles that flex your hips are in a shortened state. You probably spend at least a third of your day sitting down. Think about how much time those hip flexor muscles stay shortened. A lot. Over time, they become tighter and tighter until you look like the old man in the picture. So unless you want to look like that, perform the stretches shown below.
AAOS does not endorse any treatments, procedures, products, or physicians referenced herein. This information is provided as an educational service and is not intended to serve as medical advice. Anyone seeking specific orthopaedic advice or assistance should consult his or her orthopaedic surgeon, or locate one in your area through the AAOS Find an Orthopaedist program on this website.
MRI and x-ray for low back pain are surprisingly unreliable,1 because things like bulging discs usually aren’t a deal,2 most back pain goes away on its own,3 and trigger points (“muscle knots”) are common and can be alarmingly intense but aren’t dangerous.4 Most patients are much better off when they feel confident about these things. The power of justified, rational confidence is a huge factor in back pain.5 Sadly, many healthcare professionals continue to perpetuate the idea of fragile backs,6 which undermines that valuable confidence.
_{Hip pain is a common symptom experienced by many people. This condition can range from mild discomfort to severe pain that limits activities of daily living or functional mobility. Hip pain may prevent you from enjoying your normal work and recreational activities. When you visit a PT for hip pain, he or she will likely investigate the cause of your pain to help treat it properly.}
When a muscle contracts, it shortens. Take the biceps for example. Without getting too technical, the biceps are attached at the forearm and shoulder. When your biceps contract, they shorten and bring those two points closer together. When you rest, the muscle returns to its normal length, and the two points move farther away. Constantly contracting your biceps over a long period of time would cause them to get shorter, even at rest.

Kneel on your mat with thighs perpendicular to the floor and tops of of your feet facing down. Place a yoga block between your feet. Bring your inner knees together. Slide your feet apart so they are slightly wider than your hips, and press the tops of your feet evenly into the mat. Slowly sit down on the yoga block. Use your hands to turn the top of your thighs inward. Allow the backs of your hands to rest on your thighs. Hold for at least 30 seconds.

Hip tendonitis is inflammation of any of the hip tendons, or thick cords that attach muscles to bone. Similar to strains, hip tendonitis is commonly caused by overuse. And, also like strains, tendonitis frequently affects the same population—athletes who participate in cycling, swimming, running, and other sports that repeatedly stress the hip. High intensity interval training (HIIT) workouts and other activities that involve a high volume of kicking, squatting, and jumping can also lead to tendon inflammation.
The hip joint is designed to withstand repeated motion and a fair amount of wear and tear. This ball-and-socket joint—the body’s largest ball-and-socket joint—fits together in a way that allows for fluid movement. While many causes of hip pain can arise from the joint itself, there are numerous structures surrounding the hip that can also be the source of pain.
In both younger and older patients, vertebral fractures take weeks to heal with rest and pain relievers. Compression fractures of vertebrae associated with osteoporosis can also be treated with a procedure called vertebroplasty or kyphoplasty, which can help to reduce pain. In this procedure, a balloon is inflated in the compressed vertebra, often returning some of its lost height. Subsequently, a "cement" (methymethacrylate) is injected into the balloon and remains to retain the structure and height of the body of the vertebra. Pain is relieved as the height of the collapsed vertebra is restored.