http://www.fpnotebook.com/
Acute Low Back Pain
Aka: Acute Low Back Pain, Musculoskeletal Low Back Pain, Mechanical Low Back Pain, Low Back Pain, Lumbago- See Also
- Definition
- Low Back Pain
- Pain distribution between the costal angles and the gluteal folds
- Duration
- Acute: Less than 4 weeks
- Subacute: 4 to 12 weeks
- Chronic: More than 12 weeks
- Radiation
- Sciatica with pain radiating down one or both legs
- Low Back Pain
- Epidemiology
- Age of onset: Typically first episode occurs between ages 20-40 years old
- History
- Exam
- Differential Diagnosis
- Mechanical Causes (90%)
- Non-mechanical Causes
- Spondyloarthropathy
- Spinal Infection
- Osteoporosis
- Cancer
- Referred visceral pain
- Abdominal Aortic Aneurysm
- Pancreatic Cancer
- Genitourinary cancer
- Lumbar Stenosis
- Cauda Equina Syndrome
- Evaluation: Acute Low Back Pain without radicular symptoms (93%)
- Simple Musculoskeletal Low Back Pain
- Indicated if no Low Back Pain Red Flags
- Conservative therapy for 6 weeks
- Evaluate as in complicated back pain below
- Complicated Low Back Pain
- Indications: Risk of cancer or infection
- Lab work
- Complete Blood Count
- Urinalysis
- Erythrocyte Sedimentation Rate (ESR)
- Highly suggestive if ESR >50 mm per hour
- Prostate Specific Antigen (PSA)
- Consider in men over age 50
- Initial Imaging: L-Spine XRay Indications
- Risk factors for non-mechanical cause (see above)
- Erythrocyte Sedimentation Rate (ESR) >20 mm/hour
- Low Back Pain Red Flags
- Additional management if indicated by XRay or ESR
- Consider MRI Spine (preferred imaging)
- Consider Bone Scan
- Consider orthopedic consultation
- Simple Musculoskeletal Low Back Pain
- Evaluation: Acute Low Back Pain with radiculopathy past the knee (4%)
- See Lumbar Disc Herniation
- Conservative management in 99% of cases
- Indicated if no indications for urgent evaluation
- CT or MRI Spine if not improving by 6 weeks
- Urgent evaluation in 1% of cases
- Indications
- Cauda Equina Syndrome
- Rapid progression of neurologic deficit
- Urinary Retention
- Saddle anesthesia
- Bilateral neurologic deficit
- Protocol
- Immediate consultation for possible discectomy
- MRI lumbosacral spine
- Indications
- Evaluation: Acute Low Back Pain suggestive of Lumbar Stenosis (3%)
- Indication
- Seen in older patients
- Leg and back pain relieved when sitting
- Conservative management in most cases
- Evaluation for more significant stenosis
- Indications
- Failed conservative therapy
- Intolerable symptoms
- Neurologic deficit
- Protocol
- CT or MRI Spine
- Consultation for possible laminectomy
- Indications
- Indication
- Evaluation: Acute Low Back Pain Suggestive of Vertebral Fracture
- Obtain L-Spine XRay
- Negative XRay and persistent symptoms >10 days
- Consider bone scan or CT Spine
- Consider orthopedic consultation
- Imaging
- See Low Back Imaging
- L-Spine XRay Indications
- Acute Low Back Pain with radiculopathy
- See Low Back Pain Red Flags
- Course
- Acute Low Back Pain (95%)
- Resolution in 1 week: 50%
- Resolution in 8 weeks: 90%
- Recurrent Low Back Pain
- Recurs in at least 25% of patients within 1-2 years
- Moderate to severe in at least a third of patients
- Chronic Low Back Pain (<5%)
- Acute Low Back Pain (95%)
- Management
- References
- Arce (2001) Am Fam Physician 64(4):631-8
- Atlas (2001) J Gen Intern Med 16:123
- Bratton (1999) Am Fam Physician 60(8):2299-306
- Bueff (1996) Prim Care 23:345-64
- Jarvik (2002) Ann Intern Med 137:586-97
- Joines (2001) J Gen Intern Med 16:14-23
- Patel (2000) Am Fam Physician 61(6):1779-86
- Rose-Innes (1998) Geriatrics 53:26-40
- Swenson (1999) Neurol Clin 17:43-63