Pediatric Amputation Principles

Courtesy: Pieter Maré, M.B.Ch.B, FC Orth(SA), PhD, UCSF Orthopaedic Surgery

 Pediatric Amputations – Key Principles 

1. Concept

• Amputation in children = reconstructive procedure, not failure
• Goal:
  • Pain-free stump
  • Good prosthetic function
  • Acceptable cosmesis

2. Core Principles

 Limb & Growth Preservation

• Preserve maximum limb length
• Preserve growth plates (physis)
• Prefer disarticulation over trans-osseous amputation

 Joint Preservation

• Always try to preserve knee joint
• Maintain extensor mechanism

 Functional Optimization

• Ensure:
  • Stable stump
  • Adequate soft tissue coverage
  • Good alignment

 Holistic Approach

• Consider:
  • Child’s age & growth potential
  • Family, financial, social factors
  • Prosthetic availability

3. Indications
4. Congenital anomalies
5. Trauma (most common in developing countries)

• Mangled extremity
• Vascular injury
• Compartment syndrome

3. Infection (rare)
4. Malignancy
5. Decision: Limb Salvage vs Amputation

Key Principles:

• Life before limb
• Prefer salvage if doubt exists
• Use multidisciplinary team

Important Points:

• Children have better healing & collateral circulation
• Around 10–12 years, injury behaves more like adult

Scoring:

• MESS score – limited usefulness in children

5. Levels of Amputation (Best -> Worst)

1. Syme’s amputation
2. Transtibial
3. Through-knee
4. Transfemoral
5. Hip disarticulation

Always aim for most distal level possible

6. Why Avoid Trans-osseous Amputations in Children?

• Overgrowth (terminal osseous spike)
• Painful stump
• Bursitis
• Socket problems
• Frequent prosthetic adjustments

7. Overgrowth (Important Viva Topic)

 Definition:

• Terminal bony overgrowth at stump

 Features:

• Pain
• Prosthesis intolerance
• Skin breakdown

 Key Point:

• Not prevented by epiphysiodesis

 Management:

• Surgical revision
• Cartilage cap (experimental)

8. Ideal Stump Length (At Skeletal Maturity)

• Trans-radial  ~14 cm from olecranon
• Trans-tibial  ~15 cm from joint line

9. Important Types of Amputations

 Syme’s Amputation (Very Important)

Advantages:

• End-bearing stump
• No overgrowth
• Good prosthetic outcome

Key Surgical Points:

• Preserve heel pad
• Secure heel pad to tibia
• Avoid flap migration

 Through-Knee Amputation

Advantages:

• End-bearing
• Better prosthetic control
• Less pain vs above-knee

Key Steps:

• Preserve femoral condyles
• Attach patellar tendon to PCL

10. Vascular Injury in Children

• Collateral circulation is good
• “Pulseless but pink limb”  may NOT need exploration

Assessment:

• Capillary refill
• Perfusion
• Doppler
• CT angiography (if needed)

11. Special Points in Pediatric Trauma

• Children tolerate ischemia better
• Always attempt reconstruction first
• Early vascular repair preferred

12. Modern Advances

• Osseointegration prosthesis
• Neuro-integrated prosthetics
• Improved functional outcomes

13. Key Exam Pearls

• Amputation = reconstructive surgery
• Preserve:
  • Length
  • Physis
  • Joint
• Avoid trans-osseous amputation  overgrowth risk
• Syme’s amputation = best functional level
• Overgrowth:
  • Common complication
  • Not prevented by epiphysiodesis
• Decision = multidisciplinary + child-specific