Acute Low Back Pain

Aka: Acute Low Back Pain, Musculoskeletal Low Back Pain, Mechanical Low Back Pain, Low Back Pain, Lumbago

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II. Definitions

  1. Low Back Pain
    1. Pain distribution between the costal angles and the gluteal folds
  2. Mechanical Low Back Pain
    1. Back pain with origin in the spine, intervertebral discs and surrounding soft tissue
    2. Includes strains, disc Herniation, Spondylosis, Spondylolisthesis, Spondylolysis, compression Fractures
  3. Duration
    1. Acute: Less than 4 weeks
    2. Subacute: 4 to 12 weeks
    3. Chronic: More than 12 weeks
  4. Radiation
    1. Sciatica with pain radiating down one or both legs

III. Epidemiology

  1. Age of onset: Typically first episode occurs between ages 20-40 years old
  2. Low Back Pain is the 5th most common presenting complaint to physician office visits
    1. Responsible for 2.63 Million U.S. Emergency Department visits per year
  3. Frequent, severe Low Back Pain Prevalence occurs in 8% or 11.8 of 145 Million Employed Adults (U.S., 2015)
    1. Ages 18-29: 5.9% (1.99 Million)
    2. Ages 30-44: 7.9% (3.74 Million)
    3. Ages 45-64: 9.7% (5.52 Million)
    4. Age >65: 8.7% (0.63 Million)
    5. CDC Low Back Pain
      1. https://wwwn.cdc.gov/Niosh-whc/chart/ohs-lowback/illness?OU=FS_PAINLB&T=A&V=R
  4. Chronic Low Back Pain Prevalence
    1. U.S.: 13% (severe in 30% of this subset with Chronic Low Back Pain)
    2. Worldwide: 23%

IV. Precautions

  1. Of back pain presentations to the emergency department, 1 in 350 have a spinal emergency (e.g. Spinal Epidural Abscess)
    1. See Low Back Pain Red Flags

V. History

  1. See Low Back Pain History
  2. See Serious Low Back Symptoms (Low Back Pain Red Flags)
  3. See Thoracolumbar Trauma
  4. Presentations
    1. Mechanical Low Back Pain
    2. Radicular or neuropathic Low Back Pain
    3. Idiopathic or nonspecific Low Back Pain (70% of cases)

VI. Exam

  1. Back should be exposed (e.g. in gown) to allow for adequate palpation and visualization
  2. See Lumbar Spine Anatomy
  3. See Low Back Exam

VII. Differential Diagnosis

  1. Mechanical Causes (90%)
    1. Lumbosacral strain (70%)
      1. Isolated Trauma or repetitive overuse
    2. Lumbar Spondylosis (10%)
      1. Chronic disc degeneration and secondary foraminal narrowing in over age 40 years old
    3. Lumbar Disc Herniation (5%)
      1. Occurs at L4-5 or L5-S1 in 90-95% of cases
    4. Spondylolysis (<5%)
      1. Young athletes with frequent lumbar hyperextension (e.g. gymnastics, football)
    5. Vertebral Compression Fracture (4%)
      1. Vertebral Fracture and collapse, typically due to Osteoporosis, and most commonly at L1 and L4
    6. Spondylolisthesis (3-4%)
      1. Vertebral slippage anteriorly, at L5 in 90% of cases, with Leg Pain, Paresthesias and weakness
    7. Lumbar Spinal Stenosis (3%)
      1. Narrowing of lumbar spinal canal with back pain and leg numbness, weakness better with rest
  2. Non-mechanical Causes
    1. See Low Back Pain Red Flags
    2. Spondyloarthropathy
      1. Ankylosing Spondylitis
      2. Reiter's Syndrome
    3. Spinal Infection (Spinal Osteomyelitis, Spinal Epidural Abscess, Discitis)
    4. Osteoporosis (Vertebral Compression Fracture)
    5. Spinal Neoplasm (Spine Metastases)
    6. Referred visceral pain
      1. Abdominal Aortic Aneurysm
      2. Pancreatic Cancer
      3. Genitourinary cancer
    7. Lumbar Stenosis
    8. Cauda Equina Syndrome

VIII. Evaluation: Acute Low Back Pain without radicular symptoms (93%)

  1. Simple Musculoskeletal Low Back Pain
    1. Indicated if no Low Back Pain Red Flags
    2. Conservative therapy for 6 weeks
  2. Complicated Low Back Pain
    1. Indications: Risk of cancer or infection
      1. See Low Back Pain Red Flags
    2. Lab work
      1. Complete Blood Count
      2. Urinalysis
      3. Erythrocyte Sedimentation Rate (ESR)
        1. Highly suggestive if ESR >50 mm per hour
      4. Prostate Specific Antigen (PSA)
        1. Consider in men over age 50
    3. Initial Imaging: L-Spine XRay Indications
      1. Risk factors for non-mechanical cause (see above)
      2. Erythrocyte Sedimentation Rate (ESR) >20 mm/hour
      3. Low Back Pain Red Flags
    4. Additional management if indicated by XRay or ESR
      1. Consider MRI Spine (preferred imaging)
      2. Consider Bone Scan
      3. Consider orthopedic Consultation

IX. Evaluation: Acute Low Back Pain with radiculopathy below the knee (4%)

  1. See Lumbar Disc Herniation
  2. Conservative management in 99% of cases
    1. Indicated if no indications for urgent evaluation
    2. CT or MRI Spine if not improving by 6 weeks
  3. Urgent evaluation in 1% of cases
    1. Indications
      1. Cauda Equina Syndrome
      2. Rapid progression of neurologic deficit
      3. Urinary Retention
      4. Saddle Anesthesia
      5. Bilateral neurologic deficit
    2. Protocol
      1. MRI Lumbosacral Spine
      2. Immediate Consultation for possible Discectomy

X. Evaluation: Acute Low Back Pain with Possible Spinal Infection

  1. See Spinal Infection
  2. Low risk patients (significant risk factors, reassuring history and exam)
    1. No imaging needed
  3. Moderate risk patients (risk factors present, but no motor deficits)
    1. Obtain CRP and ESR and if elevated obtain MRI
  4. High risk patients (motor deficits identified)
    1. Obtain MRI

XI. Evaluation: Acute Low Back Pain suggestive of Lumbar Stenosis (3%)

  1. Exclude Cauda Equina Syndrome by history and exam (see above)
  2. Indication
    1. Seen in older patients
    2. Leg and back pain relieved when sitting
  3. Conservative management in most cases
  4. Evaluation for more significant stenosis
    1. Indications
      1. Failed conservative therapy
      2. Intolerable symptoms
      3. Neurologic deficit
    2. Protocol
      1. CT or MRI Spine
      2. Consultation for possible Laminectomy

XII. Evaluation: Acute Low Back Pain Suggestive of Vertebral Fracture

  1. Obtain L-Spine XRay
  2. Negative XRay and persistent symptoms >10 days
    1. Consider bone scan or CT Spine
    2. Consider orthopedic or spine Consultation

XIII. Evaluation: Acute Low Back Pain with Cancer History

  1. New or worse over prior 1-3 days radiculopathy Incontinence, weakness or sensory change and a cancer history
    1. Risk of tumor with cord compression
    2. Dexamethasone 10 mg orally or IV AND
    3. Emergent MRI (typically from Cervical Spine through Lumbar Spine)
  2. Stable low back symptoms >1 week without progression and a cancer history
    1. Consider Dexamethasone
    2. Lumbar MRI (typically from Cervical Spine through Lumbar Spine) within 24 hours
  3. Low Back Pain with normal Neurologic Exam, no Incontinence and a cancer history
    1. Routine repeat evaluation with primary provider
    2. Consider Lumbar MRI
  4. References
    1. Della-Giustina and Spangler in Herbert (2013) EM:Rap 13(11): 6

XIV. Imaging

  1. See Low Back Imaging
  2. See Low Back Pain Red Flags
  3. Precautions
    1. A careful history and examination is the most important evaluation measure in Low Back Pain
    2. Most patients with Low Back Pain will have Musculoskeletal Low Back Pain (95% will resolve within 6 weeks)
    3. Limit imaging to indications as below, including Low Back Pain Red Flags and prolonged >6 weeks
  4. Lumbar Spine XRay Indications
    1. Consider in age over 50 years or under 18 years old, or acute Lumbar Spine Trauma
    2. Vertebral Fracture
    3. Spondylolisthesis
  5. Lumbar Spine CT Indications
    1. Spinal Trauma
    2. Vertebral Fracture
    3. Vertebral dislocation
    4. Spondylolisthesis
  6. Lumbar Spine MRI Indications
    1. Lumbosacral Radiculopathy >6 weeks despite conservative management
    2. Spinal Epidural Abscess (Spinal Osteomyelitis)
    3. Spinal Cord Tumor
    4. Cauda Equina Syndrome (or spinal stenosis)
    5. Nontraumatic vascular injuries of the spine

XV. Course

  1. Acute Low Back Pain (95%)
    1. Resolution in 1 week: 50%
    2. Resolution in 8 weeks: 90%
  2. Recurrent Low Back Pain
    1. Recurs in at least 25% of patients within 1-2 years
    2. Moderate to severe in at least a third of patients
  3. Chronic Low Back Pain (<5%)

XVI. Management

  1. See Low Back Pain Management
  2. See Return to Work in Lumbar Back Pain
  3. See Low Back Rehabilitation
  4. See Low Back Muscle Fusion Rehabilitation
  5. See McKenzie Method

XVII. Prognosis

  1. Risk of progression from Acute Low Back Pain to Chronic Low Back Pain
    1. PICKUP Score
      1. https://www.evidencio.com/models/show/1119
    2. Orebro Musculoskeletal Pain Screening Questionnaire
      1. https://orthotoolkit.com/ompsq-sf/
    3. STarT Back Calculator
      1. https://startback.hfac.keele.ac.uk/training/resources/startback-online/

XVIII. Resources

  1. Keele STarT Back Approach (YouTube) for patients at risk of progressing to Chronic Low Back Pain
    1. https://www.youtube.com/watch?v=tHMJf74buW4
  2. Bob and Brad's Back Pain Playlist (YouTube)
    1. https://www.youtube.com/playlist?list=PL8l32k1r15l73-noQNhmHILi3BvtMpvU7

XIX. References

  1. Cali and Bond (2022) Crit Dec Emerg Med 36(7): 4-11
  2. Arce (2001) Am Fam Physician 64(4):631-8 [PubMed]
  3. Atlas (2001) J Gen Intern Med 16:123 [PubMed]
  4. Bratton (1999) Am Fam Physician 60(8):2299-306 [PubMed]
  5. Bueff (1996) Prim Care 23:345-64 [PubMed]
  6. Jarvik (2002) Ann Intern Med 137:586-97 [PubMed]
  7. Joines (2001) J Gen Intern Med 16:14-23 [PubMed]
  8. Patel (2000) Am Fam Physician 61(6):1779-86 [PubMed]
  9. Rose-Innes (1998) Geriatrics 53:26-40 [PubMed]
  10. Swenson (1999) Neurol Clin 17:43-63 [PubMed]
  11. Will (2018) Am Fam Physician 98(7):421-8 [PubMed]

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Related Studies

Ontology: Low Back Pain (C0024031)

Definition (MSH) Acute or chronic pain in the lumbar or sacral regions, which may be associated with musculo-ligamentous SPRAINS AND STRAINS; INTERVERTEBRAL DISK DISPLACEMENT; and other conditions.
Definition (AOT) see:http://www.nlm.nih.gov/mesh/MBrowser.html
Concepts Sign or Symptom (T184)
MSH D017116
ICD9 724.2
ICD10 M54.5
SnomedCT 156651006, 268083007, 202793005, 156648004, 40709005, 139421003, 267169009, 279039007
English Back Pain, Low, Back Pains, Low, Low Back Pains, Lumbago, Low Back Ache, Low Backache, Lower Back Pain, Ache, Low Back, Aches, Low Back, Back Ache, Low, Back Aches, Low, Back Pain, Lower, Back Pains, Lower, Backache, Low, Backaches, Low, Low Back Aches, Low Backaches, Lower Back Pains, Pain, Lower Back, Pains, Lower Back, LUMBAR PAIN, Pain, Low Back, Pains, Low Back, Nonspecific pain lumbar region, low back pain (symptom), lower back pain, lumbago (diagnosis), lumbar back pain, lumbar pain, lumbago, low back pain, Low back ache, Lumbago NOS, Low Back Pain [Disease/Finding], lumbalgia, Pain;back low, Pain;back;lumbar, low backache, low back pains, lower back pains, lumbar pains, Lower back pain, LBP - low back pain, Low back pain (disorder), Lumbago (disorder), backache lower, lower backache (diagnosis), lower backache, Low back pain, Low back syndrome, Lumbalgia, LBP - Low back pain, Nonspecific pain in the lumbar region, Lumbar pain, back; pain, low, backache; low, low back; pain, low; backache, pain; back, low, pain; low back, syndrome; low back, Lumbago (disorder) [Ambiguous], Low back pain (finding), Low Back Pain
Portuguese DOR LOMBAR, Moinha lombar, Dor lombar, Lombalgia, Dor Lombar, Lumbago
Dutch lumbago, pijn in de onderrug, lage rugpijn, lumbaalpijn, laag; rugpijn, lage rug; pijn, pijn; lage rug, pijn; onderste deel van rug, pijn; rug, laag, rug; pijn, laag, rugpijn; laag, syndroom; lage rug, Lage rugpijn, Lagerugpijn, Lumbago, Pijn, lagerug-
French Endolorissement de la région lombaire, Douleur dans la partie inférieure du dos, Douleur lombosacrale, DOULEUR LOMBAIRE, Douleur dorsale basse, Douleur lombaire basse, Douleur du bas du dos, Rachialgie lombo-sacrale, Rachialgie lombo-sacrée, Rachialgie lombosacrale, Rachialgie lombosacrée, Rachialgie lombaire, Lombalgie, Lumbago, Douleur lombaire, Douleur lombosacrée
German unterer Rueckenschmerz, unterer Rueckenschmerzen, lumbaler Schmerz, Kreuzschmerz, SCHMERZ LENDENGEGEND, Kreuzschmerzen, Lumbago, Lumbalsyndrom, Hexenschuß
Italian Dolore dorso-lombare, Lombalgia, Lombaggine, Dolore lombare
Spanish Dolor de la parte baja de la espalda, Dolor lumbar, dolor de espalda, LUMBAR, DOLOR, lumbalgia (trastorno), síndrome de dolor en la región inferior de la espalda, Lumbalgia, dolor inespecífico en la región lumbar, dolor lumbar, lumbago, lumbalgia (concepto no activo), lumbalgia (hallazgo), lumbalgia, Lumbago, Dolor de la Región Lumbar
Swedish Ländryggssmärta
Japanese ﾖｳﾂｳｼｮｳ, ﾖｳﾂｳ, 腰痛, 腰痛症
Czech lumbalgie, bolest v kříži, lumbago, Bolest dolní poloviny zad, Bederní bolest, Lumbago, ústřel, bolest bederní páteře, bolesti bederní páteře, bederní bolest
Finnish Alaselkäkipu
Russian RADIKULIT POIASNICHNYI, LIUMBAGO, POIASNICHNYI RADIKULIT, ЛЮМБАГО, ПОЯСНИЧНЫЙ РАДИКУЛИТ, РАДИКУЛИТ ПОЯСНИЧНЫЙ
Korean 아래허리통증
Polish Ból krzyża, Ból dolnego odcinka kręgosłupa, Lumbago, Ból okolicy lędźwiowo-krzyżowej
Hungarian Lumbago, Alsó háti fájdalom, derékfájás, Derékfájdalom, Lumbalis fájdalom
Norwegian Lumbago, Hekseskudd, Korsryggssmerter
Croatian BOL U KRIŽIMA, KRIŽOBOLJA
Derived from the NIH UMLS (Unified Medical Language System)

Ontology: Low Back Pain, Mechanical (C0423682)

Concepts Disease or Syndrome (T047)
MSH D017116
SnomedCT 279040009
Spanish dolor lumbar de causa mecánica ('trastorno), dolor lumbar de causa mecánica (hallazgo), dolor lumbar de causa mecánica
French Lombalgie mécanique
Italian Dolore lombare meccanico
English Mechanical Low Back Pain, mechanical low back pain, mechanical lower back pain, lower back pain mechanical, mechanical lower back pain (symptom), Mechanical low back pain, Mechanical low back pain (finding), Mechanical low back pain (disorder), Low Back Pain, Mechanical
Norwegian Mekanisk lumbago, Mekaniske korsryggssmerter
Derived from the NIH UMLS (Unified Medical Language System)

Ontology: Acute low back pain (C0457950)

Concepts Sign or Symptom (T184)
SnomedCT 202793005, 278862001
Spanish lumbalgia aguda (trastorno), lumbalgia aguda (hallazgo), lumbalgia aguda
English Pain;back low;acute, acute back low pain, acute low back pain, acute lower back pain, lower back pain acute, acute lower back pain (symptom), Acute back pain - lumbar, Acute low back pain, Acute low back pain (finding), Acute low back pain (disorder)
Derived from the NIH UMLS (Unified Medical Language System)

Ontology: musculoskeletal lower back pain (C0848192)

Concepts Sign or Symptom (T184)
English Pain;musculoskeletal;low back, musculoskeletal lower back pain
Derived from the NIH UMLS (Unified Medical Language System)

Related Topics in Symptoms

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