Importance of Identifying Red Flags

• A detailed history and careful physical examination are essential.

• Red flags are warning signs that may indicate a serious underlying condition.

• In the absence of red flags, acute low back pain is usually treated conservatively.

---

Management of Uncomplicated Acute Low Back Pain

• Early return to activity as tolerated.

• Limited rest.

• Nonsteroidal anti-inflammatory medications (NSAIDs).

• Physiotherapy.

• Muscle relaxants.

• Symptomatic treatment.

Imaging

• Diagnostic imaging is not necessary unless:

  • Symptoms persist.

  • Treatment fails.

  • Red flags are present.

• If imaging is required:

  • Start with X-rays.

  • Do not begin with MRI unless indicated.

• Unnecessary imaging does not improve outcomes.

---

Major Red Flags

---

1. Cauda Equina Syndrome (Orthopaedic Emergency)

Key Symptoms

• Bladder dysfunction

• Bowel dysfunction

• Urinary incontinence or retention

• Fecal incontinence

• Saddle anesthesia

• Bilateral lower extremity weakness or numbness

• Decreased anal sphincter tone

Action

• Immediate emergency MRI.

• Immediate interpretation.

• Early surgical treatment.

Do not miss cauda equina syndrome.

---

2. Malignancy

Risk Factors

• Age over 50 years

• History of cancer

• Unexplained weight loss

• Pain at rest

• Night pain

• Persistent pain for weeks or months without improvement

Key Points

• The spine is a common site of metastatic tumor.

• Metastasis often involves:

  • Vertebral body

  • Pedicle

• 30–40% bone loss is required before a lesion becomes visible on X-ray.

• Cortical bone loss may produce the “winking owl” sign.

• Renal tumors involving the spine may require:

  • Arteriography

  • Embolization

  • Biopsy or surgery

---

3. Spinal Infection

Clinical Clues

• Fever

• Chills

• History of:

  • Pneumonia

  • Cellulitis

  • Urinary tract infection

  • Kidney infection

• Pain at rest

• Night pain

• Diabetes

• HIV

• Immunocompromised state

Laboratory Findings

• Elevated ESR

• Elevated CRP

• Fever present in only about 50% of cases

• White blood cell count elevated in less than 50% of cases

• Blood cultures positive in approximately 24% of patients

Infection Location

• Often involves the intervertebral disc space.

Management

• MRI for diagnosis.

• Blood cultures.

• Biopsy.

• Antibiotics guided by culture and sensitivity.

• Epidural abscess requires surgery, especially if:

  • Neurological deterioration

  • Diabetic patient with MRSA

---

4. Vertebral Fracture

Risk Factors

• Osteoporosis

• Elderly patients

• Steroid use

• Minimal trauma

Facts

• Approximately 700,000 spine fractures occur annually.

• Decreased bone strength predisposes to fracture.

Management

• Treat fracture.

• Perform DEXA scan.

• Check vitamin D level.

• Initiate medical treatment for osteoporosis.

Benefits of Treatment

• Decreases incidence of spine fractures:

  • 60% after 1 year

  • 40% after 2 years

---

5. Cervical Spine Myelopathy

• May present with low back pain but symptoms arise from cervical cord compression.

• Progressive condition requiring early diagnosis and treatment.

Symptoms

• Unsteady gait

• Hand clumsiness

• Decreased manual dexterity

• Difficulty buttoning and unbuttoning

• Dropping objects

• Hyperreflexia

• Positive Hoffman sign

Diagnosis

• MRI is the study of choice.

---

Other Red Flags Outside the Spine

Consider non-spinal causes such as:

• Renal colic

• Biliary colic

• Abdominal aortic aneurysm

• Urinary tract infection

• Pancreatitis

• Pelvic inflammatory disease

---

When No Red Flags Are Present

A simple low back pain patient will have:

• No constitutional symptoms

• No major trauma history

• No neurological deficit

• No bladder or bowel dysfunction

• No gait disturbance

---

Herniated Disc

• Not considered a red flag.

• Not a serious condition in most cases.

• May cause:

  • Sciatica

  • Pain radiating to lower leg and foot

• Usually treated conservatively for at least six weeks.

• MRI may be indicated if symptoms do not improve.

---

Summary

• Red flags indicate possible serious pathology.

• Presence of red flags warrants further investigation.

• Imaging and laboratory studies are indicated when red flags are present.

• In uncomplicated acute low back pain, conservative treatment is appropriate.

• Careful history and physical examination remain the most important tools.