Quadratus Lumborum (QL) Pain and Muscle Knots: How to Release and Self-Massage at Home

Quadratus lumborum pain is often described as a deep pocket of discomfort rather than an obvious surface ache.

People point to the space between the lowest rib and the top of the pelvis—usually a little to one side of the lumbar spine—and say:

“The pain feels deep. I know the area, but I cannot get pressure into the right place.”

That experience makes sense. The quadratus lumborum, usually shortened to QL, lies deep in the back wall of the abdomen. It occupies a narrow area between the 12th rib, the iliac crest and the lumbar spine. The muscle can be involved in a familiar, pressure-responsive low-back ache, but it cannot be identified by location alone, and it is not responsible for every pain felt in the flank or lower back.

This article focuses on one specific pattern: a familiar muscular ache or “knot” in the QL region that responds predictably to controlled pressure and movement. It explains what the quadratus lumborum is, why the area is difficult to self-massage, what QL release can realistically achieve, and how to use pressure at home without treating depth as a contest.

Where is the quadratus lumborum muscle?

There is one quadratus lumborum muscle on each side of the body.

Each QL extends from the inner portion of the iliac crest and iliolumbar ligament at the top of the pelvis to the 12th rib and the transverse processes of the upper lumbar vertebrae. It is broad below, narrower above and composed of several fiber layers running in different directions.

The QL is commonly called a low-back muscle. Anatomically, it is also part of the posterior abdominal wall. That description is important because the muscle is not sitting immediately beneath the skin like a superficial muscle that can be pinched between the fingers.

Depending on the exact contact location, pressure applied from behind must pass through skin, subcutaneous tissue, thoracolumbar fascia and overlapping back muscles before influencing the QL region. The kidneys and other retroperitoneal structures lie anterior to this muscular wall. QL self-massage should therefore remain controlled and posterior; it should never become forceful probing into the side of the abdomen or underneath the lowest rib.

What does the QL do?

Anatomy texts often describe the QL as contributing to side-bending of the trunk, extension of the lumbar spine, movement or control of the pelvis, and stabilization of the 12th rib during breathing.

The real function is more complicated than one list of actions suggests. The QL has distinct layers, and research using fine-wire electromyography has found that different regions can change their activity according to the direction of trunk effort and the phase of breathing. Biomechanical research has also questioned the idea that the QL is a single dominant “lumbar stabilizer.”

A more useful practical description is that the QL participates in the changing relationship between the lower ribs, lumbar spine and pelvis. It works alongside the erector spinae, multifidus, abdominal muscles, diaphragm, psoas, gluteal muscles and thoracolumbar fascia as the body sits, stands, walks, bends, carries and breathes.

This is why QL pain should not be reduced to a simple statement such as “your QL is tight because your pelvis is uneven.” The muscle works within a system, and the system changes from task to task.

For self-massage, “releasing the QL” means applying controlled pressure to the posterolateral muscular region in which the QL lies. It does not mean proving that one deep layer has been isolated from every structure above, beside and in front of it.

What does a QL muscle knot feel like?

People who identify the QL region as familiar muscular pain commonly describe:

• a deep, dull ache on one side of the lower back;
• a dense or tired area between the bottom rib and the top of the pelvis;
• tenderness just above the back portion of the iliac crest;
• stiffness that becomes more noticeable after sitting, standing or walking for a long time;
• discomfort during a transition such as standing from a chair, rolling in bed or returning upright after bending;
• a pressure-sensitive area that produces a recognizable “good ache” when contacted carefully;
• or aching that seems to spread into the nearby lower back, upper buttock or lateral hip.

The sensation may feel like one point, but the QL is not a small round muscle. It occupies a region, and pressure delivered to that region may also influence the overlying erector spinae, thoracolumbar fascia and neighboring tissues.

Referred pain is also possible. Older clinical reports and trigger-point literature describe QL-related aching in the low back, buttock and lateral hip. Those patterns may help someone recognize a familiar response, but a referral map is not a diagnosis. Pain in those same areas can arise from many different tissues.

Does “tight” mean that the QL has become physically harder?

Not necessarily.

People use tight to describe several experiences: stiffness, tenderness, fatigue, protective tension, restricted movement or simply the urge to press an area. The word describes a real sensation, but it does not tell us exactly what the tissue is doing.

A 2025 study used shear-wave elastography to compare QL stiffness in people with chronic nonspecific low-back pain and pain-free controls. Contrary to the expectation that a painful QL would be objectively stiffer, the low-back-pain group showed lower measured stiffness. The measurement also had poor ability to distinguish people with pain from those without it.

That does not mean QL tenderness is unimportant. It means that “this feels hard” should not automatically become “this muscle is shortened and must be forced to release.”

A more useful description is:

There is a familiar, pressure-responsive muscular area in my posterolateral lower back that currently feels sensitive, guarded or difficult to move.

That is enough information to explore careful self-massage without pretending that touch alone has established a precise diagnosis.

Why can the QL region become sore or sensitive?

QL-region discomfort often develops through accumulated load rather than one dramatic injury.

• Prolonged sitting or standing

Sitting is not inherently damaging, and there is no single perfect lumbar posture. The problem is often the absence of variation.

During a long period at a desk, in a car or on a plane, the trunk and pelvis remain in a relatively fixed relationship. The QL and neighboring muscles may perform low-level work while the same tissues remain compressed or lengthened for a long time. Standing in one place can create a similar problem, especially when body weight repeatedly settles onto the same leg.

Changing position before the area becomes highly irritated is usually more useful than trying to hold one “correct” posture all day.

• Uneven or one-sided loading

The QL participates in controlling movement between the rib cage and pelvis. Tasks that repeatedly load one side may make one QL region feel more worked than the other.

Examples include carrying a child, suitcase, tool bag or heavy shopping on the same side; standing with most of the weight on one leg; working with the trunk shifted sideways; or walking over uneven ground for longer than usual.

This does not prove that one side has become permanently shorter or that the pelvis needs to be “put back into place.” It simply identifies a load pattern worth varying.

• Bending, lifting and combined movements

The lower back rarely moves in one pure direction during real work. Reaching into a car, making a bed, lifting from the side, gardening or moving a box can combine bending, rotation and side-shifting.

If the movement is sudden, unfamiliar or repeated under fatigue, the QL region may become sore along with the other muscles that help control the trunk. The response does not automatically mean the QL is injured. It may mean the region was asked to manage more load, speed or repetition than it was prepared for.

• Walking, hiking and training volume

Every step transfers load between the trunk and pelvis. A longer walk, steep hike, return to running, repeated climbing or new strength program can increase demand across the lateral trunk and hip muscles.

This is especially relevant when the activity increase is abrupt. A QL knot that appears after a long hike is not necessarily evidence of poor biomechanics. It may be an ordinary capacity-versus-load problem.

• Breathing, stress and recovery

The QL attaches to the 12th rib, and research shows that activity in at least part of the muscle can vary with the respiratory phase during trunk efforts. This does not mean one breathing pattern causes QL pain, or that breathing exercises can mechanically switch the muscle off.

Pain, stress and fatigue can nevertheless change breathing depth, trunk bracing, sleep and movement at the same time. A workload that usually feels manageable may become uncomfortable after poor sleep, a long drive or several demanding days.

What does “QL release” actually mean?

The phrase quadratus lumborum release often implies that the muscle is locked, shortened or stuck and must be pushed until it lets go.

That explanation is too mechanical.

Controlled pressure may alter tenderness, protective guarding and the way sensory information from the area is processed. After a useful session, the low back may feel less rigid, side-bending may feel easier, standing may feel more balanced, or the urge to keep rubbing the area may decrease.

Research on ischemic compression and other trigger-point pressure techniques has reported short-term improvements in pressure-pain threshold and some pain outcomes. However, the evidence is not specific enough to prove that a home tool has isolated the QL, physically dissolved a knot or permanently corrected the pelvis.

Clinical guidelines also place massage and other manual therapies within a broader approach to low-back pain that includes movement and exercise. Pressure may be useful, but it should not be asked to do the entire job.

For home self-care, a realistic definition is:

A QL release is a controlled pressure or movement technique that makes a familiar posterolateral low-back area feel less sensitive, less guarded or easier to move.

The quality of the response matters more than the depth of the pressure.

Why is the quadratus lumborum difficult to self-massage?

The QL region combines five practical difficulties.

1. The muscle is deep and layered

The QL does not present itself as a clearly isolated surface muscle. Pressure reaches several tissues before it reaches the deeper posterolateral abdominal wall.

Pressing harder does not make the contact more anatomically certain. It only sends more force through the same tissues.

2. The available space is narrow

The QL lies between the 12th rib above and the iliac crest below. Move too high and a massage point contacts the lowest rib. Move too low and it lands on the top of the pelvis.

A useful muscular contact may be separated from uncomfortable bone pressure by only a small change in height or angle.

3. The target is behind and to the side

The hand can touch the general area at the back of the waist, but that is different from applying useful pressure to the QL region. Most people cannot approach it from a relaxed, nearly perpendicular angle or maintain steady pressure for long. The shoulder reaches backward, the trunk turns or bends, and the fingers press from a mechanically weak angle.

The body is then working to create the pressure in the same region it is trying to relax.

4. “Deeper” can become “more anterior”

When a person cannot feel the intended muscle, the instinct is often to push farther around the side of the waist or underneath the rib.

That is not a safe solution. The QL forms part of the posterior abdominal wall, and sensitive internal structures lie in front of it. Self-massage should stay on the posterior muscular surface and should remain easy to unload immediately.

5. Broad and precise pressure each have limitations

A small hard ball can produce a distinct point, but it can also feel sharp, roll onto bone or encourage excessive force. A broad surface is more stable and distributes load, but may not create enough distinction for someone looking for one focal area.

The useful question is not, “Which tool reaches the deepest?”

It is, “Which pressure pattern lets me find the familiar muscular area while remaining stable, gradual and easy to stop?”

How to find the QL region for self-massage

Begin by placing your hands on the top of your hips. Trace the iliac crest backward until you can feel the upper border of the pelvis at the back of the waist.

Next, identify the lower edge of the rib cage without hooking the fingers underneath it. The QL region occupies the posterior muscular corridor between the iliac crest and the lowest rib, several centimeters to the side of the central lumbar spine.

The target is not:

1. directly on the lumbar vertebrae;
2. directly on the 12th rib;
3. directly on the iliac crest;
4. around the front or side of the abdomen;
5. or underneath the lower rib cage.

Begin with a broad, light contact just above the posterior iliac crest. Move slowly within the muscular space rather than searching immediately for the most painful point.

A potentially useful contact usually produces a dull, local or mildly referred ache that feels familiar. It should not produce sharp rib or pelvic pressure, abdominal discomfort, nausea, throbbing, electrical pain, numbness, tingling or weakness.

Because body shape varies, an online diagram cannot determine the correct location to the millimeter. The safest useful target is posterior muscular tissue—not the deepest place the fingers or a tool can reach.

How much pressure should you use on the QL region?

There is no universal pressure level or release time for a QL knot.

Begin below the intensity you believe you can tolerate. A deep muscle does not require an aggressive first session.

For an initial attempt:

1. Position the contact on the posterior muscular area between the iliac crest and lowest rib.
2. Increase the pressure gradually while keeping the abdomen, jaw and breathing relaxed.
3. Hold a comfortable stationary pressure for several slow breaths, or use only a very small controlled rocking movement.
4. Unload the area completely.
5. Stand, walk a few steps or gently move the trunk before deciding whether to repeat.

Do not remain on one point simply because a timer has not finished. Do not roll rapidly over the lowest rib, iliac crest or lumbar spine.

The pressure should feel deliberate and controllable. If the area becomes more painful later that day or the following morning, the session was probably too forceful, too long or too frequent.

Professional QL massage and self-massage between appointments

The QL is easier for another person to approach than it is for you to press with your own hand. A trained massage therapist can position the body and approach the posterolateral lower back from an angle that does not require the client to twist, reach backward or keep the surrounding muscles active. The therapist can also adjust the direction and depth of pressure while observing how the familiar area responds and how it relates to neighboring lumbar and hip muscles.

Between appointments, most people cannot reproduce that angle or sustain the same pressure with their fingers. This is where a well-positioned self-massage tool can be practical. A chair or padded surface provides the counterforce, body position controls the load, and the hands can remain relaxed. The purpose is not to replace professional assessment or treatment; it is to manage a familiar, pressure-responsive muscular area at home between visits.

Using a conventional massage ball

A tennis ball or massage ball against a wall can provide one simple contact point. Place it on the posterior muscular tissue above the iliac crest and below the lowest rib, then lean into the wall gradually.

The wall is generally easier to control than lying with full body weight on a small hard ball. Moving the feet changes the load, and stepping away removes the pressure quickly.

A ball is inexpensive and portable. Its limitations are equally clear: it can roll away, drift onto the iliac crest or rib, and concentrate a large amount of force into a small area. A smaller or harder ball feels more intense, but intensity does not prove that the QL has been reached more accurately.

Using the LittleMum Back Trigger Point Massager

The LittleMum Back Trigger Point Massager is a full-size body-weight tool designed for stable, multi-point contact across the back and gluteal muscles.

Its fourteen rounded nodes are arranged on both sides of a central channel. When the channel is aligned with the lumbar spine, the raised nodes contact the muscular areas beside it rather than concentrating body weight directly over the vertebrae. A rounded base permits small rocking adjustments, and the approximately 4.5-pound solid silicone body gives the tool enough mass and surface grip to remain comparatively stable.

For QL-region use, begin on a bed or another padded surface. Place the tool across the lower back with its central channel aligned to the spine and its lower contact nodes above—not on—the iliac crest. Keep the knees bent and the feet supported. Lower the body slowly rather than dropping onto the nodes.

The QL lies more laterally than the central columns of lumbar muscle. Small shifts through the feet can move slightly more body weight toward one side, allowing the outer nodes to engage the familiar posterolateral area without turning the movement into a large roll. Lift the body away before changing the tool’s position.

The Back Trigger Point Massager does not attempt to isolate one tiny QL trigger point. Its value is the opposite: several rounded contacts share the load across the QL region and neighboring lumbar muscles. That can be useful when the discomfort feels broad, both sides feel guarded, or a small massage ball repeatedly rolls away.

The all-silicone structure has controlled flexibility, but it is intentionally firm and substantial. It does not behave like a soft lumbar pillow or foam roller.

The Back Trigger Point Massager may suit someone who wants:

• broad, stable multi-point pressure across the lower back;
• simultaneous contact with the QL region and neighboring lumbar muscles;
• a tool that stays beneath the body during small rocking adjustments;
• firm silicone contact with limited give rather than rigid metal or hard plastic;
• and a substantial home-use tool that does not require continuous hand effort.

It may be less suitable for someone who wants one narrow point, needs a lightweight travel tool, or cannot comfortably lower onto and rise from a bed or padded surface. Its broad contact is a design choice, not a substitute for precision in every situation.

Using the LittleMum Back Deep Tissue Massager

The LittleMum Back Deep Tissue Massager creates a different pressure pattern.

Instead of fourteen rounded silicone nodes, it uses six sculpted contact ridges supported by a high-strength aluminum-alloy core. The core keeps the contact angles from collapsing under load, while the silicone exterior provides surface grip and limited cushioning. A central relief channel helps position the ridges on muscular tissue beside the lumbar spine and sacrum.

The result is lighter and more compact than the full-size Back Trigger Point Massager, but the contact is also more concentrated. The structure is reversible: one orientation presents the raised ridges for focused muscular pressure, while the other provides a supported back-stretching position. These are two different uses; the stretching side should not be described as correcting spinal alignment or treating a structural spinal condition.

For the QL region, position the central channel over the body’s midline at the level just above the iliac crest. The ridges should contact posterior muscular tissue on either side of the spine, not the vertebrae, lowest ribs or pelvic bones. A very small change in height can substantially change where the firmer ridges land.

Why the chair position matters for QL massage

Place the Back Deep Tissue Massager between the lower back and a firm, supportive chair. Begin seated slightly forward so that the product can be positioned without pressure. Keep both feet on the floor, align the central channel with the lumbar midline, then lean back gradually.

The chair creates a useful counterforce while leaving the user in control. Moving the torso back by a small amount increases the load; shifting forward releases it immediately. The feet remain grounded, so height, angle and pressure can be changed without lowering the body onto the floor or using the arms to manufacture force.

This is especially useful for the QL because the target is narrow. A user can move the torso a few millimeters upward, downward or slightly toward one side and notice which ridge reaches the familiar muscular area. If a ridge contacts the iliac crest or lowest rib, the body can move away before the tool is repositioned.

Chair use is not merely a weaker alternative to lying down. For many people, it is the most practical way to use concentrated pressure regularly. It can fit into a short break at a desk or an evening sitting routine, and it avoids the physical barrier of getting onto and off the floor.

At a recent professional exhibition, this seated setup attracted an unexpectedly strong response. People could place the product behind the lower back, lean into it gradually and feel the pressure without interrupting the demonstration to lie down. The Back Deep Tissue Massager became the best-selling product at the booth—an outcome we did not expect.

That result does not prove that the chair setup was the only reason for the sales, and it is not clinical evidence. It did reveal an important design lesson: accessibility is part of usefulness. A massage tool can have excellent pressure geometry, but if the user considers the setup inconvenient, it may remain in a cupboard. A product that works against a chair has a realistic opportunity to become part of ordinary life.

The seated position still requires active control. The Back Deep Tissue Massager is not intended to remain behind the back for hours as a passive lumbar-support cushion. Use it for a short, deliberate session, then remove it and move.

Lying on the massager transfers more body weight into its structure-held ridges and can feel considerably stronger. That option may suit someone already familiar with the placement, but it is not automatically better for QL release. Begin with the position in which the pressure is easiest to regulate.

The Back Deep Tissue Massager may suit someone who wants:

• more concentrated QL-region contact than a broad multi-node surface provides;
• a rigid internal structure that maintains its pressure angles;
• seated use against a supportive chair with immediate control through body angle;
• a central relief channel that helps keep focused pressure away from the lumbar midline;
• a lighter tool that can also be used on a bed or padded surface;
• and a separate supported-stretching orientation.

It may be less suitable for someone who wants soft, diffuse relaxation, is highly sensitive to concentrated pressure, or expects the product to function as a passive chair cushion. Body shape and natural padding affect how the ridges fit. If a contact feels sharp or lands on bone, move away and reposition rather than leaning harder.

Back Trigger Point Massager or Back Deep Tissue Massager?

The choice is not simply between “gentle” and “strong.” Both products use body weight, but they organize that pressure differently.

The Back Trigger Point Massager uses fourteen rounded nodes and a heavy, solid-silicone body to distribute pressure across a broader area. Begin on a bed or padded surface with the knees bent and feet supported. Choose this approach when stability and broader coverage matter most, particularly when the QL region and neighboring lumbar muscles feel involved together. Its main trade-off is that the tool is larger, heavier and less selective than a narrow contact design.

The Back Deep Tissue Massager uses six structure-held ridges, an aluminum-alloy core and a silicone contact layer to create more concentrated pressure. A supportive chair provides a particularly controllable starting setup. Choose this approach when one narrower QL-region area benefits from more defined contact or when seated use makes a regular session more practical. Its main trade-off is that correct positioning matters more and the firmer ridges may feel too intense for a pressure-sensitive user.

Some people may prefer the broader silicone tool after a long day when the whole lower back feels armored, and the more concentrated tool when one familiar posterolateral area remains sensitive. Others will consistently prefer one pressure pattern.

Neither product proves that the QL has been anatomically isolated. Their value lies in solving two different mechanical problems:

• Back Trigger Point Massager: stable, broad, multi-point pressure with small rocking adjustments;
• Back Deep Tissue Massager: lighter, structure-held, concentrated pressure with especially practical chair-based control.

The better tool is the one that creates a useful muscular response without requiring excessive force, awkward body positioning or pressure that is difficult to stop.

What should you do after QL release?

After removing the pressure, avoid immediately pressing the same point again to see whether it is still tender. Repeated testing can re-irritate an area that already feels calmer.

Instead:

• stand and walk for one or two minutes;
• make a few small, comfortable pelvic shifts;
• gently reach one arm upward and allow a mild side-body lengthening without forcing it;
• or take several relaxed breaths while allowing the lower ribs to move naturally.

The purpose is not to stretch the QL as far as possible. It is to notice whether standing, walking, side-bending or changing position feels easier.

If the familiar area feels less guarded, the session has already served a purpose. More pressure is not required simply because some tenderness remains.

Why does the same QL knot keep returning?

A pressure-sensitive QL region may respond well to massage and return during the same activity the following day.

That does not necessarily mean the massage failed. It may mean that pressure changed the current sensitivity without changing the load that repeatedly provokes it.

If the QL-region pain keeps returning, consider:

• how long you sit, stand or drive without changing position;
• whether body weight repeatedly settles onto the same leg;
• whether a child, bag, case or work equipment is usually carried on one side;
• whether walking, hiking, lifting or training volume recently increased;
• whether the trunk repeatedly bends and turns in the same direction during work;
• whether movement breaks begin before or only after the area becomes highly irritated;
• and whether sleep, stress and general recovery have changed.

The long-term answer is not necessarily a more aggressive QL stretch. The region may benefit from greater capacity rather than repeated attempts to make one muscle permanently loose.

Progressive walking, hip and trunk strengthening, varied carrying, and gradual exposure to the tasks that matter can all contribute. Research supports exercise for chronic low-back pain on average, although no single exercise method is best for every person. The useful program is one that matches the person’s symptoms, goals and ability to continue it.

Massage can create a more comfortable starting point for movement. It should not replace movement indefinitely.

When QL self-massage is not the right starting point

This article is about a familiar muscular ache that responds predictably to pressure and movement. The QL occupies the same general region as several spinal, rib, abdominal and urinary structures, so unusual flank or low-back pain should not automatically be treated as a muscle knot.

Stop self-massage and seek appropriate assessment if the pain:

• followed a significant fall, collision or other injury;
• is severe, rapidly worsening, constant or substantially different from previous muscular pain;
• is accompanied by fever, chills, nausea or vomiting;
• occurs with painful or frequent urination, cloudy or foul-smelling urine, blood in the urine, or sharp pain moving toward the abdomen or groin;
• is associated with numbness, tingling, progressive leg weakness or major difficulty walking;
• occurs with numbness around the saddle region or a new change in bladder or bowel control;
• or is accompanied by unexplained weight loss, a known cancer history or another significant systemic illness.

A familiar QL trigger point may produce a dull referred ache into the nearby back, buttock or lateral hip. That is not the same as unfamiliar burning, electrical or shooting pain accompanied by altered sensation or weakness.

Ask a healthcare professional before using firm body-weight pressure if you have severe osteoporosis, a bleeding or blood-clotting disorder, take blood-thinning medication, are undergoing cancer treatment, have had recent abdominal, spinal or pelvic surgery, are pregnant, or have another condition that may make concentrated pressure unsafe.

Persistent QL-region pain also deserves assessment when it repeatedly interrupts sleep, work, walking or ordinary movement despite sensible changes in pressure, activity and recovery.

A practical way to think about QL release

The quadratus lumborum is difficult to self-massage because it is deep, lies in a narrow space between the lowest rib and pelvis, and sits where the hand cannot apply relaxed, sustained pressure easily.

That is why pressure design matters.

A conventional ball provides one simple but mobile point. The LittleMum Back Trigger Point Massager uses fourteen rounded nodes, a spine-aware central channel, substantial silicone weight and small rocking adjustments to create broad, stable contact. The LittleMum Back Deep Tissue Massager uses six structure-held ridges, a central relief channel and a rigid aluminum-alloy core to create more concentrated pressure—with the added practical advantage of controlled use against a supportive chair.

Neither method needs to “break” a knot to be worthwhile.

If controlled pressure makes the familiar QL region feel less sensitive, less guarded or easier to move, the release has served a practical purpose. Use only as much pressure as is needed to create that change, then allow movement, recovery and gradual strengthening to do their part.

Good QL self-massage is not the ability to tolerate the deepest possible pressure.

It is the ability to find a useful muscular contact, control it and stop before useful pressure becomes unnecessary irritation.

References

1. Bordoni B, et al. Anatomy, Abdomen and Pelvis, Quadratus Lumborum. StatPearls. StatPearls Publishing. Updated 2026.
2. Phillips S, Mercer S, Bogduk N. Anatomy and Biomechanics of Quadratus Lumborum. Proceedings of the Institution of Mechanical Engineers, Part H. 2008;222(2):151–159.
3. Park RJ, Tsao H, Cresswell AG, Hodges PW. Differential Activity of Regions of the Psoas Major and Quadratus Lumborum During Submaximal Isometric Trunk Efforts. Journal of Orthopaedic Research. 2012;30(2):311–318.
4. Park RJ, Tsao H, Cresswell AG, Hodges PW. Changes in Direction-Specific Activity of Psoas Major and Quadratus Lumborum in People With Recurring Back Pain Differ Between Muscle Regions and Patient Groups. Journal of Electromyography and Kinesiology. 2013;23(3):734–740.
5. de Franca GG, Levine LJ. The Quadratus Lumborum and Low Back Pain. Journal of Manipulative and Physiological Therapeutics. 1991;14(2):142–149.
6. Lucas N, Macaskill P, Irwig L, Moran R, Bogduk N. Reliability of Physical Examination for Diagnosis of Myofascial Trigger Points: A Systematic Review of the Literature. Clinical Journal of Pain. 2009;25(1):80–89.
7. López-Redondo M, et al. Quadratus Lumborum Muscle Stiffness in Chronic Non-Specific Low Back Pain: A Diagnostic Accuracy Study. European Spine Journal. 2025;34(12):5449–5458.
8. Lu W, Li J, Tian Y, Lu X. Effect of Ischemic Compression on Myofascial Pain Syndrome: A Systematic Review and Meta-Analysis. Chiropractic & Manual Therapies. 2022;30:34.
9. Qaseem A, Wilt TJ, McLean RM, Forciea MA. Noninvasive Treatments for Acute, Subacute, and Chronic Low Back Pain: A Clinical Practice Guideline From the American College of Physicians. Annals of Internal Medicine. 2017;166(7):514–530.
10. Hayden JA, Ellis J, Ogilvie R, Malmivaara A, van Tulder MW. Exercise Therapy for Chronic Low Back Pain. Cochrane Database of Systematic Reviews. 2021;9.
11. National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms and Causes of Kidney Infection and Kidney Stones. National Institutes of Health.