Acute Pain
Defined as onset within 0-6 weeks
90% of patients with low back pain
Only 10-20% can be given precise patho-anatomical diagnosis
Chronic Pain
Pain with onset > 3 months
5% of patients with low back pain
85% of costs due to loss of work and compensation
50% have clear structural diagnosis made for cause of their back pain
A brief outline of treatment will be as under:
Acute LBP
Bed rest
functional in 6.6 days compared to 11.8 days for those kept ambulatory 1
2 days of bedrest are as effective as 7 days and results in 45% less time away from work 2
more beneficial in radiculopathy
Analgesics
Muscle relaxants: controversial
Aerobic exercise
Weight loss
Stop smoking
Chronic LBP
Back exercises
Williams/flexion exercises: better tolerated
Extension exercises: may be more efficacious
Physical Therapy
Ultrasound
Diathermy
TENS
Exercise instruction
Traction
Bracing- controversial, not clearly efficacious, may weaken back/abdominal musculature
Facet injection: probably not effective
Epidural Steroid Injection for radiculopathy
controversial
66% with sx < 6 months show improvement
33% with sx > 12 months show improvement
Narcotics in chronic LBP are best avoided
Antidepressants in low doses may be beneficial
Important neurologic deficits (ie. foot drop) best treated surgically
Long-term functional outcome unaffected if surgery delayed up to 12 weeks
Surgery: Indications
Progressive or severe neurologic deficit
Persistent neuromotor deficit despite 4-6 weeks conservative therapy
Persistent radiculopathy, sensory deficit or reflex loss after 4-6 weeks
conservative therapy with +SLR, consistent clinical findings and favorable
psychosocial circumstances (no depression, substance abuse or
somatization disorder)
Outcome
Acute LBP
Resolution of pain (without sciatica) in 6 weeks with nonspecific treatment in 75-90%
60% will have a recurrence within one year
> 50% with sciatica recover in 6 weeks
Chronic LBP:
Successful rehabilitation (%) vs. length of symptoms
Summary Points
Back pain seen in up to 90% of population
Only 20-50% of cases have a clear patho-anatomic etiology identified
75-90% of those with acute back pain will have resolution of pain within 6 weeks
Know the "red flags"
Weight loss
fever
age > 50
Adenopathy
History of cancer, TB, IV drug abuse
Neurological symptoms
uni/bilateral
urinary retention
saddle anesthesia
Writhing in pain
(visceral/vascular)
Unrelenting pain at rest
(infection/ malignancy)