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Lower limb soft tissue injury

Background knowledge 🧠

Definition

  • Injury to the soft tissues (muscles, tendons, ligaments) of the lower limb, commonly due to trauma.
  • Includes strains, sprains, contusions, and tendon injuries.
  • May involve associated structures like blood vessels and nerves.

Epidemiology

  • Common in athletes, especially those involved in contact sports.
  • High incidence in the general population due to falls, accidents, and sports.
  • More frequent in males and younger adults.
  • Most common injuries: ankle sprains, hamstring strains.

Aetiology and pathophysiology

  • Direct trauma (e.g., collisions, falls) or indirect mechanisms (e.g., sudden twisting, overstretching).
  • Acute vs. chronic injuries: Acute typically due to a specific event; chronic from overuse.
  • Inflammatory response initiated with pain, swelling, and dysfunction.
  • Potential for associated injuries: fractures, nerve damage.
  • Delayed healing or complications can arise from improper management.

Types

  • Strains: Injury to muscles or tendons, graded I-III based on severity.
  • Sprains: Injury to ligaments, also graded I-III.
  • Contusions: Bruising of muscle or soft tissue due to direct trauma.
  • Tendon injuries: Includes tendinopathy and ruptures, commonly in the Achilles tendon.
  • Compartment syndrome: Increased pressure within a closed muscle compartment, potentially limb-threatening.

Clinical Features 🌑️

Symptoms

  • Pain, varying from mild to severe, depending on the injury.
  • Swelling and bruising, typically more evident in the initial hours post-injury.
  • Loss of function or reduced range of motion in the affected limb.
  • Muscle weakness or instability, particularly in ligamentous injuries.
  • Possible audible ‘pop’ or sensation of tearing during the injury.

Signs

  • Visible swelling, bruising, or deformity, particularly in severe injuries.
  • Tenderness to palpation over the injured area.
  • Reduced range of motion or inability to bear weight.
  • Positive special tests depending on injury type (e.g., Anterior Drawer for ankle sprain).
  • Signs of compartment syndrome: Severe pain, pallor, paresthesia, paralysis, pulselessness.

Investigations πŸ§ͺ

Tests

  • Clinical assessment: History, physical examination, and functional testing.
  • Imaging: X-ray to rule out fractures, MRI for soft tissue visualization.
  • Ultrasound: Useful for assessing tendon injuries.
  • Compartment pressure measurement: If compartment syndrome is suspected.
  • Blood tests: Rarely needed but may include CRP, CK if systemic involvement is suspected.

Management πŸ₯Ό

Management

  • RICE protocol: Rest, Ice, Compression, Elevation for initial management.
  • Analgesia: NSAIDs for pain relief, consider paracetamol for milder pain.
  • Physiotherapy: Essential for rehabilitation, focusing on strength, flexibility, and proprioception.
  • Surgical intervention: Reserved for severe injuries like complete tendon ruptures or significant ligament tears.
  • Patient education: Importance of adherence to rehabilitation and gradual return to activity.

Complications

  • Chronic pain or instability due to improper healing.
  • Compartment syndrome: Can lead to muscle necrosis and require fasciotomy.
  • Tendon re-rupture: Risk after surgical repair if rehabilitation is inadequate.
  • Development of chronic tendinopathy or osteoarthritis in the affected joint.

Prognosis

  • Most soft tissue injuries have a good prognosis with appropriate management.
  • Recovery time varies: Mild strains/sprains 1-2 weeks, severe injuries 6-12 weeks or longer.
  • Early and appropriate rehabilitation improves outcomes.
  • Return to full activity should be gradual to prevent re-injury.
  • Some patients may experience long-term sequelae like weakness or reduced mobility.

Key points

  • Early recognition and appropriate management are crucial to prevent complications.
  • Rehabilitation is a cornerstone of recovery for lower limb soft tissue injuries.
  • Understanding the type and severity of injury guides treatment decisions.
  • Close monitoring for signs of complications like compartment syndrome is essential.

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