Back Pain Physiotherapy
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Direct answer
Red flags first, reassurance and movement second, imaging almost never: that is the working order in back pain physiotherapy, because roughly nine in ten presentations are mechanical and most acute episodes settle within four to six weeks. After screening for serious pathology — cauda equina syndrome, fracture, infection, malignancy — the mechanical majority is classified by pain pattern and directional preference, then treated with graded activity, McKenzie or Williams exercise, core stabilisation and explicit advice against bed rest. Radicular pain adds neural mobility work; progressive deficit or sphincter disturbance leaves the caseload for urgent referral.
What you must remember
- Lifetime prevalence is commonly quoted at 60 to 80 per cent, peaking between 35 and 55 years — a leading cause of missed work and a staple of Indian orthopaedic outpatient departments.
- Triage proportions: about 90 per cent non-specific mechanical, roughly 5 per cent nerve root pain, under 2 per cent serious pathology; imaging without red flags finds incidental changes more often than diagnoses.
- Red flags: onset under 20 or over 55 years, non-mechanical night pain, fever or weight loss, malignancy history, corticosteroid use, significant trauma, progressive motor deficit, and saddle anaesthesia with bladder or bowel disturbance (cauda equina — same-day referral).
- The root triplet: L4 — knee extension, knee jerk, medial malleolus sensation; L5 — great toe extension (extensor hallucis longus), dorsum of foot, no reliable reflex; S1 — plantarflexion, ankle jerk, lateral foot.
- Straight-leg raise is positive when radicular pain reproduces between 30 and 70 degrees; the crossed straight-leg raise (contralateral leg provokes pain) is the far more specific test for disc herniation.
- Directional programmes: Williams flexion flattens the lumbar lordosis for extension-intolerant backs (facet syndrome, spondylolisthesis, stenosis); McKenzie extension suits flexion-intolerant discogenic pain that centralises.
- Bed rest is discouraged beyond two or three days; staying active demonstrably speeds recovery and lowers the risk of chronicity.
- Waddell's five non-organic signs — superficial tenderness, simulation, distraction, regional weakness, overreaction — flag psychosocial yellow flags predicting slow recovery; screening aids, not accusations of faking.
Working through an acute discogenic episode
A 38-year-old labourer arrives with three days of low back pain shooting to the right calf after lifting a sack, flexed and listing left. The red-flag screen comes first: no night pain, no fever, no weight loss, no steroid or trauma history, sphincters intact — cleared, so he remains a physiotherapy patient. The pattern speaks next: sitting and flexion aggravate, walking eases, coughing shoots pain into the calf — discogenic with likely L5 root irritation. Examination confirms it: right straight-leg raise reproduces calf pain at 40 degrees, extensor hallucis longus grades 4 of 5, dulled dorsal-foot sensation, ankle jerk preserved.
Prescription follows classification. Prone press-ups centralise the calf pain, so the McKenzie derangement programme anchors treatment: ten press-ups every two to three waking hours, morning flexion avoided, a lumbar support at work. From week two, core stabilisation layers on — abdominal bracing, dead bug, bird dog and side-plank progressions targeting transversus abdominis and multifidus — with walking as the aerobic base. Education closes each session: stay at modified work, no bed rest, most episodes resolve within six weeks. Review at one to two weeks carries one standing instruction: worsening weakness, bilateral leg symptoms or any bladder involvement means immediate referral, not more exercises.
Where students slip
Reflexes fail more candidates than tests do: the ankle jerk belongs to S1, the knee jerk to L4, and L5 has no tidy reflex — attaching the ankle jerk to an L5 disc gets the level wrong, since an L5–S1 disc typically irritates the S1 root. Raising the leg past 70 degrees with pain is usually hamstring tightness, not radiculopathy. The cauda equina stem is baited with bilateral sciatica plus urinary retention and expects "emergency referral", never "traction". The final error is prescribing flexion by habit to an older stenotic or spondylolytic back and worsening it — the directional preference comes from assessment, not routine.
Frequently asked questions
At what angle is a straight-leg raise considered positive?
Radicular pain reproduced between 30 and 70 degrees of elevation; pain beyond suggests hamstring tightness, and the crossed raise adds specificity for disc herniation.
Which reflex belongs to each lower lumbar root?
Knee jerk L4, ankle jerk S1; L5 has no reliable deep tendon reflex, the medial hamstring sometimes serving as proxy.
What features demand same-day referral as cauda equina syndrome?
Saddle anaesthesia, urinary retention or incontinence, bilateral sciatica and lax anal tone — a surgical emergency, not a physiotherapy presentation.
How do Williams and McKenzie programmes differ?
Williams uses repeated flexion to flatten the lumbar lordosis in extension-intolerant backs such as facet syndrome; McKenzie uses repeated extension for flexion-intolerant derangement whose pain centralises.
What is the advice on bed rest in acute low back pain?
Avoid it beyond two or three days at most; continued graded activity speeds recovery, and prolonged rest feeds chronicity.
Name Waddell's five non-organic signs.
Superficial tenderness, simulation, distraction, regional disturbances such as non-anatomical weakness, and overreaction during examination.