The most painful moment: the transition from sitting to standing

Getting up from a chair after hours of sitting and feeling the lower back "lock" — that deep pain that forces you to stay bent forward for the first few steps until the spine "unlocks" — is one of the most prevalent low back pain patterns in the contemporary urban population. This specific pattern, with worsening on the transition from sitting to standing, points to two very precise muscles: the quadratus lumborum (QL) and the iliopsoas.

After hours of seated posture, the iliopsoas (composed of the psoas major and the iliacus muscle) remains in maximal shortening. On standing, this shortened muscle forces the pelvis into anteversion and pulls the lower back forward, overloading the facet joints and the extensor muscles. The QL, in turn, "locks" the pelvis in the seated position with its action of fixation between the 12th rib and the iliac crest — and this fixation persists in the first movements of getting up, generating the characteristic pain.

The epidemic of postural low back pain

8h+
PER DAY SEATED
is the reality of a substantial share of Brazilian workers — a relevant modifiable risk factor for postural low back pain associated with QL and psoas
high
CAUSE OF DISABILITY
low back pain is among the leading causes of work absenteeism in Brazil, with significant economic impact on health and productivity
—
PAIN REDUCTION
systematic reviews and meta-analyses on acupuncture for chronic low back pain describe clinically relevant pain reductions in some patients, with variable effect sizes and heterogeneity across studies
—
TRIGGER POINTS IN QL/PSOAS
clinical series report high prevalence of active trigger points in the QL and/or psoas in patients with chronic low back pain — findings frequently not investigated in routine assessment

From prolonged sitting to lumbar locking: the mechanism

  1. Prolonged sitting

    The iliopsoas remains shortened for hours. The QL works in constant tonic activity to stabilize the spine in the seated position, accumulating fatigue and developing trigger points.

  2. Gluteal amnesia

    In the seated position, the gluteal muscles are neurologically inhibited by constant compression. With weak and inactive gluteals, the psoas and QL take on even more stabilization work — overloading themselves.

  3. Trigger point formation in the QL

    The QL develops hyperirritable nodules that cause deep low back pain, difficulty changing position, and the characteristic "locking" when trying to stand up.

  4. Psoas shortening

    The shortened psoas pulls the lumbar spine into hyperlordosis and pushes the femoral heads anteriorly — overloading the facet joints and the L4-L5 and L5-S1 discs.

  5. Sensitization cycle

    Chronic pain sensitizes the central nervous system, making the lower back hypersensitive. Small movements such as getting up from a chair — which should be painless — become intensely painful.

Recognizing the QL and psoas pattern

Critérios clínicos
08 itens

Low back pain from QL and psoas — typical clinical signs

  1. 01

    Deep low back pain when getting up from a chair — especially after long periods seated

  2. 02

    Need for "a few steps" to straighten the spine after standing up

  3. 03

    Pain when turning in bed or changing position during sleep

  4. 04

    Low and lateral low back pain, worse when leaning the trunk to the side (QL)

  5. 05

    Deep low back pain radiating to the groin or anterior thigh (psoas)

  6. 06

    Difficulty standing upright for prolonged time

  7. 07

    Temporary relief when moving or lying in fetal position

  8. 08

    Marked worsening on days of heavy seated work compared with active days

Myths and facts about low back pain on standing

Myth vs. Fact

MYTH

Pain when getting up from a chair means a problem in the intervertebral disc

FACT

The pattern of pain when getting up from a chair with improvement after the first few steps is characteristic of myofascial pain from the QL and psoas — not of disc herniation. Disc herniation typically causes pain radiating to the leg and worsens with flexion, not specifically with postural transition.

MYTH

Gym and weight training worsen low back pain

FACT

On the contrary: resistance exercise with adequate supervision is the most effective treatment for chronic low back pain in the long term. What worsens it is incorrect exercise (excessive flexion with load in the acute phase). Medical exercise prescription is an essential part of treatment.

MYTH

Lumbar locking is the disc "slipping out of place"

FACT

Intervertebral discs do not 'slip out of place' — herniation is a rupture of the annulus fibrosus, not a reversible displacement. The typical lumbar locking on standing is QL spasm and psoas shortening — a muscular condition, not discal.

Protocol with acupuncture and electroacupuncture

Functional assessment
1st visit

Thomas test for psoas shortening. Palpation of the QL in prone position. Assessment of gluteal strength. Ergonomic assessment. Exclusion of secondary causes (red flags: radiation, neurologic déficit, fever, weight loss).

QL and multifidus treatment
Sessions 1–4

Dry needling of the QL in prone position (transverse processes of L1–L4 as reference). Needling of the multifidus and semispinalis. 2–4 Hz electroacupuncture for lumbosacral segmental analgesia.

Psoas and iliopsoas treatment
Sessions 5–8

Needling of the psoas via lateral approach (guided by surface anatomy between transverse processes and iliac crest) or anterior approach. Acupuncture at BL-23, BL-25, GV-4 for the lumbar segmental component. Paravertebral electroacupuncture.

Rehabilitation and prevention
Sessions 9–10

Medical prescription of progressive gluteal strengthening. Ergonomic guidance for the workstation (active breaks every 45 min). Prescription of psoas stretching. Discharge with maintenance plan.

Clinical pearl: the Thomas test

Frequently asked questions

FREQUENTLY ASKED QUESTIONS · 04

Frequently Asked Questions

The psoas is a deep muscle, and access is more intense than for superficial muscles. Patients describe the sensation as "deep pressure" or "pain that is good" — the local twitch response of the trigger point is transient and quickly followed by a sensation of release. The brief discomfort is part of the therapeutic process and signals that the correct muscle has been reached.

For established chronic low back pain (more than 3 months), the standard protocol is 10–12 sessions over 6–8 weeks. Significant improvement is expected after the 4th–6th session. Cases with multiple perpetuating factors (severe sedentary lifestyle, overweight, high stress, poor ergonomics) may require longer cycles or monthly maintenance sessions.

Not necessarily change jobs, but ergonomic adjustments are essential for lasting results. The chair should have adequate lumbar support, the monitor should be at eye level, and — most important — active 5-minute breaks every 45–50 minutes of seated work are fundamental. The physician can provide a letter of ergonomic guidance if necessary.

Supervised clinical Pilates is an excellent complement to medical acupuncture for postural low back pain. The combination is more effective than either treatment alone: acupuncture reduces pain and eliminates trigger points, creating muscular conditions for the strengthening work of Pilates. The physician coordinates both approaches according to patient progress.