Erector Spinae Muscles: Anatomy Overview
The erector spinae is a group of three muscles — iliocostalis, longissimus, and spinalis — that run bilaterally from the pelvis to the skull along either side of the vertebral column. They are the primary muscles responsible for:
- Spinal extension (arching the back)
- Lateral flexion of the trunk
- Postural maintenance in upright standing
Because these muscles are continuously active in daily life and are frequently recruited for lifting and manual tasks, they are highly susceptible to strain injuries.
Causes of Erector Spinae Strain
| Mechanism | Example |
|---|---|
| Sudden heavy lifting | Pulling heavy luggage, moving furniture |
| Unexpected loading | Missing a step, carrying groceries |
| Prolonged static posture | Extended sitting at a desk, driving |
| Eccentric overload | Lowering a heavy object quickly |
| Direct trauma | Fall, sports collision |
| Repetitive strain | Manual labour, construction work |
Symptoms of Erector Spinae Strain
Primary symptoms:
- Sudden onset low back pain (often felt as a 'pull' or 'snap')
- Palpable tenderness along the paraspinal muscles
- Muscle spasm causing rigid back posture
- Pain worsening with lumbar extension, lateral flexion, or rotation
- Difficulty standing upright after prolonged sitting
Absent features (differentiating from disc herniation):
- No radiation below the knee
- No neurological symptoms (numbness, weakness, tingling)
- No positive straight leg raise test
- No bladder or bowel changes
Grading Erector Spinae Strains
| Grade | Description | Recovery Time |
|---|---|---|
| Grade I | Microscopic fibre tearing, mild pain | 1 to 2 weeks |
| Grade II | Partial muscle tear, moderate pain and spasm | 3 to 6 weeks |
| Grade III | Complete muscle rupture, severe pain, deformity | 3+ months |
Physiotherapy Treatment Protocol
Acute Phase (Days 1 to 3)
- Ice therapy: 15 minutes every 2 to 3 hours for first 48 to 72 hours
- Relative rest: Maintain gentle movement; avoid bed rest beyond 24 hours (delays recovery)
- Activity modification: Avoid heavy lifting, sustained lumbar flexion
- Gentle movement: Supine knee-to-chest (5 reps), slow walking
Sub-Acute Phase (Days 4 to 14)
- Heat therapy: 15 to 20 minutes, 3 to 4 times daily
- Soft tissue massage: Gentle paraspinal massage to reduce spasm
- Progressive mobility exercises:
- Cat-camel: 10 repetitions
- Supine hip rotation: 10 repetitions
- Seated forward lean: 30 seconds × 5
- TENS or IFT electrotherapy for pain management
Rehabilitation Phase (Weeks 3 to 6)
- Core strengthening: Bridge, dead bug, modified plank
- Erector spinae progressive loading: Back extensions on physio bench (bodyweight first)
- Hip hinge training: Romanian deadlift with light weight to restore safe movement patterns
- Ergonomic review: Assess lifting technique, workstation posture
Exercises to Avoid in Acute Erector Spinae Strain
- Heavy deadlifts or squats
- Aggressive forward bending (touching toes)
- Sit-ups (increase erector spinae eccentric load)
- Running on hard surfaces
- Twisting sports activities
Preventing Recurrence
- Hip hinge practice: Teach proper lumbar-neutral lifting mechanics
- Core strengthening programme: Transversus abdominis and multifidus provide segmental spinal support
- Warm-up before physical activity: 5 minutes of spinal and hip mobility before lifting
- Ergonomic workstation: Prevent prolonged static lumbar loading
For related guides, see lower back pain self-care and facet joint pain treatment.
References
- Hides JA et al. Evidence of lumbar multifidus muscle wasting ipsilateral to symptoms in patients with acute/subacute low back pain. Spine. 1994.
- Beattie PF. Current understanding of lumbar intervertebral disc degeneration. Physical Therapy. 2008.
- Delitto A et al. Low back pain. Journal of Orthopaedic & Sports Physical Therapy. 2012.