- 1 Definition/Description
- 2 Clinically Relevant Anatomy
- 3 Etiology
- 4 Epidemiology
- 5 Characteristics/Clinical Presentation
- 6 Differential Diagnosis 
- 7 Diagnostic Procedures
- 8 Examination
- 8.1 Inspection
- 8.2 Palpation
- 8.3 ROM
- 8.4 Special tests
- 9 Medical Intervention
- 10 Physical Therapy Management
- 10.1 Cold Therapy
- 10.2 TENS and Ultrasound
- 10.3 Stretching
- 10.3.1 A Few Stretching Exercises: 
- 10.4 Soft Tissue Manipulation
- 10.5 Massage
- 10.6 Strengthening Exercises
- 11 Prognosis
- 12 References
Lumbar strain accounts for 70% of mechanical low back pain.  It is defined as over stretch injury or tear of paraspinal muscles and tendons in the low back.   Much of the knowledge of lumbar strain is extrapolated from peripheral muscle strains. 
In strains, the muscle is subjected to an excessive tensile force leading to the overstraining of the myofibres and consequently to their rupture near the myotendinous junction.  
The current classification of muscle injuries identifies mild, moderate and severe injuries based on the clinical impairment they bring about. 
Clinically Relevant Anatomy
The lumbar spine consists of 5 movable vertebrae numbered L1-L5. The complex anatomy of the lumbar spine is a remarkable combination of these strong vertebrae, multiple bony elements linked by joint capsules, and flexible ligaments/tendons, large muscles, and highly sensitive nerves. It also has a complicated innervation and vascular supply.
The lumbar spine is designed to be incredibly strong, protecting the highly sensitive spinal cord and spinal nerve roots. At the same time, it is highly flexible, providing for mobility in many different planes including flexion, extension, side bending, and rotation  
Lumbar strain can originate in the following muscles    : M. erector spinae (M. iliocostales, M longissimus, M. spinalis) M semispinales, Mm multifidi, Mm rotatores M. quadratus lumborum M. serratus posterior.
Strains are defined as tears (partial or complete) of the muscle-tendon unit. Muscle strains and tears most frequently result from a violent muscular contraction during an excessively forceful muscular stretch from lifting heavy objects or sudden twisting motions  . Any posterior spinal muscle and its associated tendon can be involved, although the most susceptible muscles are those that span several joints. Acute and chronic lumbar strain pain can be defined as: acute pain is most intense 24 to 48 hours after injury. Chronic strains are characterized by continued pain attributable to muscle injury. 
Low back pain is the second most common symptom that causes patients to seek medical attention in the outpatient setting. Approximately 70% of adults have an episode of LBP as a result of work or play.
Exact numbers regarding the international frequency of low back injuries are not known. Studies done in The United States have shown that 7-13% of all sports injuries in intercollegiate athletes are low back injuries. The most common back injuries are muscle strains (60%) and disc injuries (7%). Athletes are more likely to sustain injuries in practice (80%) than during competition (6%)  . American football (17%) and gymnastics (11%) are reported to have the highest rates of low back injury. 
A recent French study reported over 50% of French individuals aged 30-64 years had experienced at least 1 day of LBP over the previous 12 months. 17% had suffered LBP for more than 30 days in the same 12-month period.  The authors noted that the prevalence of LBP varied between men and women. There was an increased incidence with increasing age for LBP that lasted more than 30 days. These data were similar to those of other countries.
In an African study, the mean LBP point prevalence among adults was 32%, with an average 1-year prevalence of 50% and an average life-time prevalence of 62% 
The onset of lumbar strain could be sudden after trauma or gradual due to persistent stress.  The clinical presentation includes pain in the lumbar muscles or nonspecific pain.  The pain could be exacerbated during standing and twisting motions, with active contractions and passive stretching of the involved muscle increasing the pain. 
Other symptoms are point tenderness, muscle spasm, possible swelling in and around the involved musculature, a possible lateral deviation in the spine with severe spasm and a decreased range of motion. 
Differential Diagnosis 
- Disc herniation
- Compression fracture
- Spinal stenosis
- Ankylosing spondylitis
Laboratory tests: No abnormalities. 
Radiographs: Imaging is not indicates unless there are:
- Red flag signs
- Radicular or abnormal neurological clinical features
- Symptoms have persisted for more than a month
In these cases, it is important to exclude other differential diagnosis, by using X-rays or MRI. 
Evaluation should be done by taking a thorough history from the patients that include the pain location, intensity, aggravating and relieving activities, description of previous pain episodes and to identify any red flags. 
- Inspect the spine for abnormal curvatures (f.e. scoliosis) or Erythema.
- Observe the gait (posture and movement)let the patient walk across the room, turn around and let him come back. -Observe the seated position of the patient abnormal posture caused by pain and muscle spasm. 
- Tenderness in the midline or paraspinal. 
- Flexion of the back -Signs of limited range of motion or a decreased lumbar lordosis. 
- Neurovascular assessment (L4-S1) – Test heel and toe walking °Positive test: marked asymmetry
- SLR± ankle dorsiflexion – Positive test: radiated pain into calf
- Crossed SLR – Pain in the affected limb, when testing the unaffected limb
- SLR + Lasègue
- Bowstring sign – SLR until pain, then flex the knee. Positive test: reduces pain when nerve is irritated
- Faber test – Flexion Abduction External Rotation of the hip Pain in SIJ pathology
- One leg extension test – standing on 1 leg with the back in extension. Pain can indicate spondylolysis
- Hamstring flexibility
- Leg length evaluation – Measure from ASIS to medial malleolus (cm)
The neurological tests are mostly negative and a lumbar strain is not accompanied by paresthesias or weakness in the legs or feet. Patients with lumbar spine are tender to palpation in the lower back. Other physical findings are loss of normal lumbar lordosis and spasm of the paraspinal muscles. The SLR’s may cause pain in the lower back just like other tests that cause spinal motion. Often there’s an antalgic posture. 
- Non-steroidal anti-inflammatory drugs (NSAIDs) are recommended in the acute phase to help reduce the swelling and inflammation. 
- Diclofenac (voltaren)
- Cox-2 selective NSAID’s ( less effects on the gastrointestinal tract)
- Muscle relaxants can also be prescribed to treat muscle spasms and facilitate light physical therapy. 
- No studies support the use of oral steroids in patients with acute low back pain. 
Physical Therapy Management
From the principles of treatment is preserving the spine motion segment by avoiding shearing and stretching forces on the lumbar motion segment.  Also, recent studies have found that continuing ordinary activities within the limits permitted by the pain leads to more rapid recovery than bedrest. 
In the acute phase of a lumbar strain Cold therapy should be applied (for a short period up to 48 h)to the affected area to limit the localized tissue inflammation and edema.  
TENS and Ultrasound
TENS and ultrasound are often used to help control pain and decrease muscle spasm  
Mild stretching exercises along with limited activity.
A Few Stretching Exercises: 
- Single and double knee to chest Lie down on your back with your knees bent and your heels on the floor. Pull your knee or knees as close as you can to your chest, and hold the pose for 10 seconds. Repeat this 3 to 5 times.
- Back stretch Lie on your back, hands above your head. Bend your knees and , keeping your feet on the floor, roll your knees to onse side, slowly. Stay at one side for 10 seconds repeat 3 to 5 times.
- Press up Begin by laying flat on the ground (face down). When doing this exercise it is important to keep the hips and legs relaxed and in contact with the floor. Keep your hands in line with your shoulders. Inhale, then exhale and press up using the hands keeping the lower half of your body relaxed. Hold until you need to inhale, then move down, lay flat on the ground to rest, and repeat ten times.
- Kneeling lunge(stretching iliopsoas)
- Stretching piriformis
- Stretching quadratus lumborum
Soft Tissue Manipulation
Soft tissue manipulation was found to decrease pain and improve ROM. 
There is insufficient evidence to make a reliable recommendation regarding massage for acute low back pain. There is limited evidence about the use of acupuncture in the treatment of acute low back pain. 
Progression of strengthening exercises should begin once the pain and spasm are under control. The muscles requiring the most emphasis are the abdominals, especially the obliques, the trunk extensors and the gluteals. Placing all of the emphasis in the rehabilitation specifically on the injured muscle is not beneficial. Training the core stability is an important part in the treatment of a lumbar strain and for the further prevention of low back pain. 
As with all spinal injuries, posture and body mechanics should be assessed and corrected as needed.
A Lumbar strain improves within 2 weeks. Normal functions are restored after 4 – 6 weeks. 
Lumbar strain accounts for 70% of mechanical low back pain. It is defined as over stretch injury or tear of paraspinal muscles and tendons in the low back.Much of the knowledge of lumbar strain is extrapolated from peripheral muscle strains.
Low Back Strain Symptoms and Treatment
Jonathan Cluett, MD, is board-certified in orthopedic surgery. He served as assistant team physician to Chivas USA (Major League Soccer) and the United States men’s and women’s national soccer teams.
Jason DelCollo, DO, board-certified in family medicine. He is associate faculty at Philadelphia College of Osteopathic Medicine as well as adjunct faculty with the Crozer Family Medicine Residency Program, and is an attending physician at Glen Mills Family Medicine in Glen Mills, Pennsylvania.
Muscle strains and lumbar sprains are the most common causes of low back pain. A low back muscle strain occurs when the muscles of the back are abnormally stretched too far. A lumbar sprain occurs when the ligaments, the tough bands of tissue that hold bones together, are torn from their attachments.
Differentiating a strain from a sprain can be difficult, as both injuries will have similar symptoms. Many doctors refer to both injuries as a category called “musculoligamentous injuries” of the lumbar spine. In general, it doesn’t matter what you call the problem because the treatment and prognosis for both back strains and sprains is the same.
Nearly everyone will experience low back pain at some point in their life; it is the second most common cause of missed days of work in the United States —only a common cold causes more missed work. Almost all of these low back injuries are due to injuries of the muscle or ligament.
If you don’t know the cause of your back pain, you should have it evaluated by a doctor. Some warning signs of a serious injury to the spine include:
- Loss of control of bladder or bowels
- Progressive lower extremity weakness
- Pain that wakes you from sleep
- Severe, constant pain
While most back pain is caused by a muscle strain or ligament sprain, there are serious conditions that require more immediate treatment. If you are unsure of the cause of your symptoms, you should be evaluated by a physician.
Low Back Muscle Strains
The spine is supported by large muscles called the paraspinal muscles. These muscles both support the spinal column as well as the weight of the upper body. The five lumbar vertebrae are connected by tough ligaments that help to maintain the position of the spinal column.
These muscles, ligaments, and bones all work together to provide control and strength for nearly all activities. The lumbar spine and its muscles are needed for most all movements and activities. For this reason, the lumbar spine is prone to injury, and when an injury has been sustained, people have difficulty performing many activities.
Most lumbar muscle strains and sprains cause symptoms isolated to the low back, usually they do not cause problems in the legs like some other spine conditions. The most common symptoms of a lumbar strain or sprain are:
- Pain around the low back and upper buttocks
- Low back muscle spasm
- Pain associated with activities, and generally relieved with rest
When the lumbar spine is strained or sprained, inflammation of the soft-tissues results. This inflammation causes pain and can cause muscle spasm. People are often surprised at how painful and debilitating a lumbar strain or sprain can be—these are not minor injuries. They often cause severe symptoms for a few days and may not completely resolve for weeks or months. That said, over 90% of patients are completely recovered from an episode of lumbar muscle strain or sprain within one month.
We do know some factors that tend to influence the development of this type of problem, but often these symptoms strike in unexpected situations. Most commonly, patients who develop a lumbar strain or sprain are doing an activity that places their back at risk. This may be a sudden forceful movement, lifting a heavy object, or twisting the back in an unusual manner. Knowing how to properly lift can help to prevent many back injuries.
Some well-known factors that contribute to low back pain include:
- Poor conditioning
- Improper use/lifting technique
If you have persistent problems with your lumbar spine, consider these issues. If you smoke, are overweight, or do not perform regular back strengthening exercises, then you have steps that you can take to help control your symptoms.
Treatment of a lumbar strain can usually be accomplished with some simple steps. The most challenging aspect of treatment is that it often takes time to find relief and symptoms can last weeks or even months. However, there are some aspects of treatment that can help ensure future episodes of injury are less likely.
It may be that the best treatment for typical, muscular back pain is time. Unfortunately, speeding the healing process has not been shown to be terribly effective with most any standard treatment, and certainly potential harmful treatments should be avoided. In particular, medications, especially potentially addictive medications, should not be used for treatment of back pain. The best recommendation, based on scientific data that has compared hundreds of treatments to find the most beneficial and safe treatment, is to encourage people to move gently. Whether this is with physical therapy or other activities, light, gentle movement is the best way to heal muscular back pain.
A low back strain, often called a lumbar strain, is an injury to the large muscles in the lumbar spine. Treatment can usually be effective with a few simple steps.