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Joint Dislocation and Subluxation | 마이메르시 MyMerci
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Joint Dislocation and Subluxation

NCLEX Review Guide: Joint Dislocation and Subluxation

Pathophysiology and Assessment

Definition and Types

  • Dislocation occurs when joint surfaces are completely separated, while subluxation involves partial displacement of joint surfaces with some contact remaining.
  • Most commonly affects shoulder, hip, elbow, and finger joints due to their mobility and exposure to trauma.
  • Can be traumatic (acute injury) or pathologic (underlying joint disease, congenital abnormalities).

Memory Aid: "DISPLACED"

  • Deformity visible
  • Immobility/loss of function
  • Severe pain
  • Position abnormal
  • Length discrepancy
  • Assess neurovascular status
  • Crepitus may be present
  • Edema and swelling
  • Don't delay treatment

Clinical Manifestations

  • Severe pain at the affected joint with inability to move the joint through normal range of motion.
  • Visible deformity with abnormal positioning of the extremity and possible shortening of the affected limb.
  • Swelling, bruising, and muscle spasm around the joint area.
  • Neurovascular compromise may occur, requiring immediate assessment of pulses, sensation, and motor function distal to the injury.

Key Points

  • Always assess neurovascular status before and after reduction
  • Document the 5 P's: Pain, Pallor, Paresthesia, Pulselessness, Paralysis
  • Time is critical - prolonged dislocation increases risk of complications

Nursing Management and Interventions

Immediate Care

  1. Perform comprehensive neurovascular assessment including pulse, sensation, movement, and capillary refill distal to injury
  2. Immobilize the joint in position found - do not attempt to reduce dislocation
  3. Apply ice to reduce swelling and pain, using 20 minutes on/20 minutes off protocol
  4. Administer prescribed pain medication and prepare for conscious sedation if reduction is planned
  5. Document baseline neurovascular status and monitor for changes every 15-30 minutes

Clinical Scenario

A 25-year-old athlete presents with shoulder dislocation after a fall. The arm appears shortened and internally rotated. Priority nursing action is to assess neurovascular status, immobilize the extremity, and prepare for immediate reduction to prevent complications such as axillary nerve damage or vascular compromise.

Post-Reduction Care

  • Reassess neurovascular status immediately after reduction and compare to baseline findings.
  • Apply prescribed immobilization device (sling, splint, or brace) to maintain joint stability and prevent re-injury.
  • Monitor for complications including recurrent dislocation, nerve damage, or avascular necrosis.
  • Educate patient on activity restrictions, proper use of immobilization device, and signs of complications requiring immediate medical attention.

Key Points

  • Never attempt field reduction - transport with joint immobilized in position found
  • Post-reduction X-rays confirm proper alignment and rule out fractures
  • Early mobilization after initial immobilization prevents joint stiffness

Complications and Patient Education

Potential Complications

  • Neurovascular damage including nerve compression or vascular injury leading to compartment syndrome or permanent disability.
  • Avascular necrosis of the femoral head (particularly with hip dislocations) due to disruption of blood supply.
  • Recurrent dislocation due to ligament laxity or inadequate rehabilitation following initial injury.
  • Post-traumatic arthritis and chronic joint instability affecting long-term function and quality of life.

Dislocation vs. Subluxation Comparison

AspectDislocationSubluxation
Joint ContactComplete separationPartial contact maintained
SeverityMore severeLess severe
ReductionUsually requires medical interventionMay self-reduce
ImmobilizationLonger durationShorter duration

Patient Education

  • Teach proper use and care of immobilization devices, including skin assessment and hygiene measures to prevent complications.
  • Emphasize importance of compliance with activity restrictions and gradual return to normal activities as prescribed.
  • Instruct on signs and symptoms requiring immediate medical attention: increased pain, numbness, tingling, color changes, or inability to move fingers/toes.
  • Discuss importance of physical therapy and rehabilitation exercises to restore strength, flexibility, and prevent recurrence.

Key Points

  • Hip dislocations are orthopedic emergencies requiring reduction within 6 hours
  • Shoulder dislocations have highest recurrence rate, especially in young patients
  • Patient education on activity modification prevents future injuries

Study Tips and Common Pitfalls

NCLEX Study Tips

Priority Nursing Actions - "RAIN"

  • Reassess neurovascular status frequently
  • Assess pain and provide appropriate interventions
  • Immobilize joint in position found
  • Notify physician immediately for reduction

Common Pitfalls to Avoid

  • Never attempt to reduce a dislocation in the field - this can cause further damage
  • Don't forget to reassess neurovascular status after any intervention
  • Avoid focusing only on the obvious injury - assess for associated fractures
  • Don't delay treatment for hip dislocations - time is critical to prevent avascular necrosis

Quick Check Questions

  • ☐ Can you identify the 5 P's of neurovascular assessment?
  • ☐ Do you know the difference between dislocation and subluxation?
  • ☐ Can you prioritize nursing interventions for joint dislocation?
  • ☐ Do you understand complications specific to different joint dislocations?

Remember: Your thorough assessment and prompt intervention can prevent permanent disability. Trust your knowledge and prioritize patient safety - you've got this! Every question you master brings you closer to becoming the nurse your patients need.

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