Arthroscopic procedures overview

🔑 Core Concept - The Keyhole Peek

• Arthroscopy: A minimally invasive surgical (MIS) technique to visualize, diagnose, and treat problems inside a joint.
• Mechanism: Uses an arthroscope (camera) and specialized instruments inserted through small incisions called portals.
  • The joint is distended with sterile fluid (e.g., saline) to create space and provide a clear view (lavage).
• Advantages vs. Open Surgery: ↓ post-op pain, ↓ infection risk, faster recovery, and improved cosmesis.
• Applications: Both diagnostic (e.g., assessing cartilage) and therapeutic (e.g., meniscectomy, ligament reconstruction).

⭐ Fluid Extravasation: A key complication where irrigation fluid leaks into surrounding soft tissues, potentially leading to compartment syndrome, especially in shoulder arthroscopy.

🦵 Clinical Manifestations - A Joint Venture

• Knee (Most Common):

  • Indications: Meniscal tears (locking, clicking), ACL/PCL tears (instability), chondral defects (pain, swelling), loose bodies.
  • Procedures: Partial meniscectomy, meniscal repair, ACL reconstruction (e.g., patellar or hamstring tendon graft), microfracture/chondroplasty.

• Shoulder:

  • Indications: Rotator cuff tears (weakness, night pain), labral tears (instability, clicking), impingement syndrome.
  • Procedures: Rotator cuff repair, Bankart repair (anterior instability), SLAP lesion repair, subacromial decompression.

• Hip:

  • Indications: Femoroacetabular impingement (FAI), labral tears.
  • Procedures: Labral debridement/repair, osteoplasty for FAI (cam/pincer lesions).

⭐ The "unhappy triad" (O'Donoghue's triad) classically involves tears of the ACL, MCL, and medial meniscus. However, modern data suggests lateral meniscal tears are more frequently associated with acute ACL injuries.

🔬 Arthroscopic Procedures Overview

Minimally invasive surgery (MIS) for joint diagnosis and treatment using an arthroscope (camera) and specialized instruments inserted through small incisions called portals.

• Common Joints: Knee (meniscectomy, ACL repair), Shoulder (rotator cuff repair, labral repair), Hip, Ankle.
• Advantages: ↓ post-op pain, ↓ infection risk, faster recovery, and improved cosmesis compared to open arthrotomy.
• Risks: Infection, DVT, neurovascular injury, instrument breakage, fluid extravasation (compartment syndrome).

⭐ Joint distension with saline is crucial. It expands the joint space for visualization and flushes debris. Inadequate pressure can lead to poor visibility and iatrogenic cartilage damage.

⚠️ Complications - Perilous Portals

• General Risks: Infection (septic arthritis), DVT/PE, instrument breakage, fluid extravasation (e.g., compartment syndrome), chondral damage.

• Joint-Specific Neurovascular Injury:

  • Shoulder:
    • Posterior Portal: Axillary nerve, posterior humeral circumflex a.
    • Anteroinferior Portal: Musculocutaneous nerve.
  • Knee:
    • Posteromedial Portal: Saphenous nerve & vein.
    • Posterolateral Portal: Common peroneal nerve.
  • Ankle:
    • Anterolateral Portal: Superficial peroneal nerve.
    • Posterolateral Portal: Sural nerve.
  • Hip:
    • Anterolateral Portal: Superior gluteal nerve.

⭐ The axillary nerve is the most commonly injured nerve during shoulder arthroscopy. It lies closest to the posterolateral portal, approximately 3-4 cm distal to the posterolateral acromion.

⚡ Biggest Takeaways

• Arthroscopy is a minimally invasive surgery (MIS) for visualizing, diagnosing, and treating intra-articular pathology.
• Most common joints are the knee (meniscal tears, ACL reconstruction) and shoulder (rotator cuff repair, labral tears).
• Major advantages over open surgery include faster recovery, less post-op pain, and lower infection rates.
• Key complications, though rare, include septic arthritis, DVT/PE, and iatrogenic neurovascular or cartilage injury.
• Active infection over the joint is an absolute contraindication.