Elbow Arthroplasty

Elbow Arthroplasty - Joint Journey Kickoff

• Definition: Surgical replacement of elbow joint with artificial components (prosthesis).
• Goals: ↓Pain, ↑Range of Motion (ROM), ↑Function.
• Types:
  • Total Elbow Arthroplasty (TEA): Replaces both humeral and ulnar articular surfaces.
  • Hemiarthroplasty: Replaces one surface (e.g., radial head, distal humerus).
• Key Indications:
  • Severe arthritis (Rheumatoid Arthritis, Osteoarthritis, Post-traumatic)
  • Comminuted distal humerus fractures (elderly, low-demand patients)
  • Non-union/malunion of distal humerus
  • Failed previous elbow surgery

⭐ Rheumatoid arthritis is the most common indication for total elbow arthroplasty, though post-traumatic arthritis is increasingly common.

Elbow Arthroplasty - Choosing Your Champion

• Prosthesis Types & Selection Factors:
  • Unlinked (Resurfacing):
    • For good bone stock, intact ligaments, younger active patients.
    • Preserves bone, more physiological motion.
    • Risk: Instability.
  • Linked (Semi-constrained):
    • For poor bone stock, ligamentous insufficiency, older/low-demand patients, revision cases.
    • Provides inherent stability.
    • Most common.
  • Linked (Constrained):
    • Historical, rarely used due to ↑ loosening.

⭐ Linked (semi-constrained) prostheses are generally preferred in patients with poor bone stock or ligamentous insufficiency to provide inherent stability.

Elbow Arthroplasty - Navigating the Nerves

• Ulnar Nerve: Highest risk; lies posterior to medial epicondyle.
  • Crucial: meticulous identification, gentle handling, and protection.
  • Prophylactic anterior transposition often performed to reduce tension/compression.
• Radial Nerve: Vulnerable with anterior/anterolateral surgical approaches.
  • Located anterior to the lateral epicondyle, near the radiocapitellar joint.
  • Injury can result in wrist drop and supinator muscle weakness.
• Median Nerve: Less frequently injured but at risk.
  • Risk during extensive anterior exposure; courses medial to the biceps tendon and brachial artery.

⭐ Routine ulnar nerve identification and protection (often involving anterior transposition) is critical during elbow arthroplasty to prevent postoperative neuropathy.

Elbow Arthroplasty - Dodging the Dangers

• Key Complications:
  • Infection: Early (<3 mo) vs. Late. Aggressive treatment.
  • Nerve Injury: Ulnar nerve (📌). Monitor; consider exploration.
  • Aseptic Loosening: Ulnar component. Pain, instability → revision.
  • Periprosthetic Fracture: Intra/post-op. Manage by type/stability.
  • Instability: Balance ligaments, ensure component position.
  • Triceps Insufficiency: Weak extension. Repair/reconstruct.
  • Wear & Osteolysis: Polyethylene wear → bone loss.

⭐ Aseptic loosening, particularly of the ulnar component, is the most common long-term complication leading to revision of total elbow arthroplasty.

Elbow Arthroplasty - Beyond the Horizon

• Prognosis & Outcomes:
  • Good pain relief & functional improvement.
  • Implant survival: ~80-90% at 10 years.
  • Lifelong activity modification crucial.
• Complications Leading to Revision:
  • Aseptic loosening (most common).
  • Infection.
  • Periprosthetic fracture.
  • Implant wear/breakage.
• Revision Arthroplasty:
  • Technically demanding.
  • Higher complication rates than primary TEA.
  • Outcomes generally inferior to primary.

⭐ Patients undergoing total elbow arthroplasty are typically advised a permanent lifting restriction of 5-10 lbs (2-5 kg) to maximize implant longevity.

High‑Yield Points - ⚡ Biggest Takeaways

• TEA indications: inflammatory arthritis (e.g., Rheumatoid Arthritis), elderly comminuted distal humerus fractures, and severe post-traumatic arthritis.
• Hemiarthroplasty is an option for distal humerus fractures with intact collateral ligaments and stable ulna.
• Key contraindications include active infection, inadequate soft tissue envelope, neuropathic joint, and non-compliance.
• Common complications: infection (highest rate), aseptic loosening, ulnar neuropathy, and periprosthetic fractures.
• Linked (constrained) implants offer stability but ↑stress and loosening; unlinked (unconstrained) require good ligaments, risk ↑dislocation.
• Lifelong activity restrictions (e.g., lifting <2-5 kg) are crucial post-TEA to prevent implant failure.
• TEA generally has higher revision rates and lower long-term survivorship compared to hip or knee arthroplasty.