Amputation: Definition, Types, and Medical Significance

Amputation is the surgical removal of a limb or body part, performed when tissue is irreversibly damaged, diseased, or threatens life.

Common Indications

• Severe trauma (crush, blast, vascular injury)
• Peripheral arterial disease (critical limb ischemia)
• Diabetic foot infection/gangrene
• Malignant tumors (sarcoma)
• Severe infection (necrotizing fasciitis, osteomyelitis)
• Congenital limb defects

Classification by Level

Upper Limb

• Forearm (Transradial)
• Above Elbow (Transhumeral)
• Shoulder Disarticulation
• Forequarter (Interscapulothoracic)

Lower Limb

• Toe/Partial Foot (Transmetatarsal, Lisfranc, Chopart, Syme)
• Below Knee (Transtibial)
• Knee Disarticulation
• Above Knee (Transfemoral)
• Hip Disarticulation
• Hemipelvectomy

Other Types

• Digit Amputation: Finger or toe.
• Partial Amputation: Incomplete severance; may require completion.
• Revision Amputation: Re-amputation at a higher level due to complications (infection, poor healing, neuroma).
• Replantation: Surgical reattachment of a completely severed part (emergency microsurgery).

Surgical Principles

Modern amputation prioritizes: viable soft tissue coverage, bone beveling, myodesis (muscle-to-bone fixation), nerve handling (gentle traction, ligation, proximal placement), and shaping for prosthetic fitting. It can be elective (planned) or emergent (life-saving).