As the primary care physician for a 79-year-old patient who was in a car accident 10 days ago and now presents with a swollen, bruised left arm, what should I do?

Immediate Evaluation and Imaging Required

As the PCP for this 79-year-old patient with persistent arm swelling and bruising 10 days post-motor vehicle accident, you must immediately arrange imaging (X-rays at minimum, consider CT if available) to rule out occult fracture, compartment syndrome sequelae, or vascular injury, and assess for signs of infection or deep vein thrombosis that could be life-threatening in this geriatric trauma population.

Why This Matters in Geriatric Trauma

Your patient falls into a high-risk category that is frequently undertriaged in trauma systems. Older adults (≥65 years) have:

• Higher mortality rates despite lower injury severity scores compared to younger patients 1, 2
• Decreased physiologic reserve and impaired immune function 1
• Altered cardiovascular and pulmonary responses to injury 1
• High likelihood of polypharmacy, particularly anticoagulation therapy 1

The fact that she went to a hospital 10 days ago but still has significant swelling and bruising suggests either:

1. An injury was missed initially (common in geriatric undertriage)
2. A complication has developed
3. Normal healing is impaired by age-related factors

Immediate Assessment Steps

Clinical Examination Focus

Evaluate specifically for:

• Compartment syndrome (late presentation possible): Check for pain out of proportion, pain with passive stretch, paresthesias, pallor, pulselessness
• Vascular injury: Assess distal pulses, capillary refill, temperature differential
• Neurological status: Document motor and sensory function in all nerve distributions
• Infection signs: Warmth, erythema, fever, systemic signs (note: may be blunted in elderly) 3
• DVT risk factors: Immobility since accident, calf tenderness, unilateral edema 3

Imaging Requirements

• Plain radiographs of the entire left arm (shoulder to wrist) to identify:

  • Occult fractures (clavicle, proximal humerus, elbow, forearm)
  • Displacement or alignment issues
  • Joint involvement

• Consider CT imaging if radiographs are negative but clinical suspicion remains high, as older adults benefit from more aggressive imaging 1

• Venous duplex ultrasound if DVT suspected (immobilized limb for 10 days is moderate-to-high risk) 3

Critical Management Considerations

If Fracture Identified

Open fracture concerns (even if wound appears closed now):

• If any history of skin break, treat as contaminated 3
• Antibiotic prophylaxis should have been given within hours of injury, but if infection suspected now, obtain cultures and start treatment-dose antibiotics 3
• Infection rates in open fractures range 6-44% vs 1% in closed fractures 3

Closed fracture management:

• Most geriatric upper extremity fractures can be managed conservatively with sling, pain control, and early range-of-motion exercises 4
• However, refer to orthopedics for displaced fractures, intra-articular involvement, or functional impairment

Thromboprophylaxis Decision

Given 10 days of likely reduced mobility post-accident:

• Assess VTE risk: Upper extremity trauma + age + immobility = moderate risk 3
• If no active bleeding concerns and no contraindications, initiate LMWH thromboprophylaxis 3
• This should have been started earlier but is still indicated if risk persists

Infection Prevention/Treatment

• Check tetanus status and update if needed 3
• If any concern for developing infection (warmth, erythema, systemic symptoms):
  • Obtain wound cultures if applicable
  • Start empiric antibiotics (amoxicillin-clavulanate or cephalosporin per guidelines) 3
  • Consider clindamycin + gentamicin if beta-lactam allergy 3

Common Pitfalls in Geriatric Trauma

1. Undertriage is the norm: Half of seriously injured older adults are treated in non-trauma centers 1. Your patient may have been inadequately evaluated initially.

2. Vital signs are unreliable: Normal blood pressure and heart rate don't exclude serious injury in elderly patients on beta-blockers or with altered physiology 1

3. Delayed complications: Compartment syndrome, DVT, and infection can present days to weeks after initial injury 3, 5

4. Functional decline: Even "minor" injuries can trigger cascade of immobility, deconditioning, and loss of independence 2

Referral Thresholds

Immediate orthopedic referral if:

• Displaced fracture identified
• Neurovascular compromise
• Compartment syndrome suspected
• Open fracture or wound requiring surgical debridement

Consider geriatric trauma consultation for comprehensive frailty assessment and multidisciplinary care planning 2, 6

Documentation Priorities

Document:

• Pre-injury functional status and independence level
• Current medications (especially anticoagulants)
• Detailed neurovascular exam
• Reason for delayed presentation to you (what was done at initial hospital visit?)

The 10-day delay with persistent symptoms is a red flag that demands thorough re-evaluation rather than reassurance.