Amputation for Bone Tumors

Amputation: Indications & Planning - Chopping Block Choices

• Absolute Indications: Uncontrolled tumor (infection, fungation); pathological fracture with extensive soft tissue involvement; neurovascular encasement making salvage impossible; recurrence post-limb salvage.
• Relative Indications: Poor patient compliance for salvage protocols; extensive bone loss requiring complex reconstruction; patient preference.
• Pre-operative Evaluation:
  • Biopsy: Crucial; longitudinal incision, avoid neurovascular bundles & tumor contamination.
  • Staging: TNM, Enneking (📌 GTM: Grade, Tumor site, Metastasis).
  • Imaging: MRI (local extent, NV involvement), CT Chest (metastasis).
  • Functional & psychological assessment.

⭐ Contraindications to limb salvage surgery often include major neurovascular involvement, extensive muscle infiltration, or pathological fracture through a tumor with significant soft tissue contamination.

Amputation: Levels & Principles - Surgical Slice Savvy

• Oncologic Principles:
  • Wide margins: 3-5 cm healthy tissue. Crucial to prevent local recurrence; avoid tumor breach.
  • No-touch technique: Minimize tumor cell seeding during surgery.
  • Neurovascular bundle: Careful dissection; ligate vessels, nerves gently pulled, transected cleanly to retract.
  • Stump quality: Myodesis (muscle-to-bone) or myoplasty (muscle-to-muscle/fascia) for optimal prosthetic fit & function, reducing pain.

⭐ Myodesis, anchoring muscle to bone, is crucial for a functional stump, improving prosthetic control and reducing muscle atrophy.

• Common Amputation Levels (Bone Tumors):
  • Upper Limb:
    • Forequarter: For extensive shoulder girdle tumors (e.g., scapula, clavicle).
    • Shoulder Disarticulation: For proximal humerus tumors.
  • Lower Limb:
    • Hemipelvectomy/Hip Disarticulation: For large pelvic or proximal femur tumors.
    • Above-Knee (AK/Transfemoral): For femur or proximal tibia tumors.
    • Below-Knee (BK/Transtibial): For tibia/fibula tumors; knee preservation is key for function.
    • Syme's: Ankle disarticulation for distal tibia/foot tumors; creates an end-bearing stump.

Amputation: Complications & Care - Post-Op Pitfalls

Early Complications:

• Hematoma, Infection: Prompt drainage; targeted antibiotics.
• Wound Dehiscence, Flap Necrosis: Surgical debridement & revision.
• DVT/PE: Crucial prophylaxis (LMWH); early mobilization.
• Acute Stump Pain: Multimodal analgesia.

Late Complications:

• Phantom Limb Pain: Management: analgesics (gabapentin, amitriptyline), mirror therapy, TENS.
• Neuroma Formation: Painful nerve end. Local injections, surgical excision, TMR.
• Stump Skin Problems (ulcers, dermatitis): Daily hygiene, proper socket fit, skin care.
• Joint Contractures: Regular physiotherapy, correct positioning.
• Psychological Sequelae (depression, anxiety): Counseling, peer support.

⭐ Phantom limb pain is experienced by a majority of amputees and requires a proactive, multimodal management approach, distinct from phantom limb sensation.

Amputation: Rehab & Results - Life After Limb Loss

• Multidisciplinary Team (MDT): Crucial for holistic care. Includes surgeon, physiatrist, physiotherapist, occupational therapist, prosthetist, psychologist.
• Rehabilitation Pathway: A phased approach.

• Factors Influencing Outcome & Prosthetic Success:
  • Level of amputation (energy expenditure varies)
  • Stump quality: well-shaped, pain-free, good soft tissue
  • Patient motivation & active participation
  • Comorbidities (e.g., diabetes, peripheral vascular disease)
  • Prosthetic design, fit, and alignment
• Psychosocial Support: Essential for adjustment to limb loss, body image, and Quality of Life (QoL); peer support groups.
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⭐ Early mobilization and a well-fitted prosthesis, combined with strong patient motivation, are key determinants of successful rehabilitation after amputation for bone tumors.

High‑Yield Points - ⚡ Biggest Takeaways

• Amputation for bone tumors: a salvage procedure when limb preservation fails or is contraindicated.
• Key indications: locally advanced unresectable tumors, neurovascular encasement, severe pathological fractures, infection post-salvage.
• Wide surgical margins are crucial for oncologic control and minimizing local recurrence.
• Phantom limb pain is a frequent challenge; requires multimodal management.
• Early rehabilitation and prosthetic fitting are essential for optimal functional outcome.
• Skip metastases can influence the level of amputation required for complete tumor eradication.