Immediate Post-Operative Fitting (IPOF)

Definition

Historical Background

• Introduced by Berlemont (France, 1958) and popularized by Weiss (Poland) and Burgess (USA) in the 1960s.
• Revolutionized amputee rehabilitation by shifting from the traditional "wait-and-watch" approach (6–8 weeks) to early ambulation.

Principles / Rationale

Components of IPOF System

1. Sterile wound dressings (innermost layer)
2. Stockinette over the residual limb
3. Felt or foam padding over bony prominences
4. Rigid plaster-of-Paris (POP) cast encompassing the stump
5. Waist belt or supracondylar strap for suspension
6. Pylon (adjustable metal rod/endoskeletal component)
7. SACH foot (Solid Ankle Cushion Heel) or simple foot plate

In modern practice, prefabricated rigid removable dressings (RRDs) and thermoplastic materials may replace traditional POP.

Indications

• Trans-tibial (Below-knee) amputation — most common and ideal indication
• Trans-femoral (above-knee) amputation (less common)
• Vascular disease amputees (with careful wound monitoring)
• Traumatic amputees with good wound condition
• Dysvascular amputees who are medically stable
• Patients with high motivation and rehabilitation potential

Contraindications

Absolute

• Infected wounds / gas gangrene
• Systemic sepsis
• Severe peripheral vascular disease with inadequate tissue perfusion
• Psychiatric instability / non-compliant patient
• Flexion contracture of >15° at knee or hip

Relative

• Poorly controlled diabetes mellitus
• Severe cardiac or pulmonary disease (cannot tolerate ambulation)
• Morbid obesity
• Cognitive impairment
• Bilateral amputees (early stage)

Technique (Step-by-Step)

In the Operating Room (Immediately after amputation)

1. Haemostasis achieved; wound closed in standard fashion.
2. Sterile dressings applied directly over the wound.
3. Stockinette pulled over residual limb.
4. Felt/foam padding placed over fibular head, tibial crest, and other bony prominences.
5. Plaster of Paris applied in layers — forms a snug, rigid, total-contact socket.
6. Cast extended to incorporate the knee joint (or hip for AK amputation) to prevent flexion contracture.
7. Suspension belt attached at the waist.
8. Pylon attached distally to the cast.
9. SACH foot fixed at the end of the pylon.
10. Pylon length adjusted so foot is ~1 inch shorter than the contralateral limb (to prevent premature full weight-bearing).

Post-Operative Management

Day 0 (Day of Surgery):

• Patient transferred to recovery with IPOF in place.
• No weight-bearing initially; limb elevated.

Day 1–2:

• Partial weight-bearing with parallel bars and physiotherapist supervision.
• Weight restricted to 10–15 lbs (4.5–7 kg) initially.

Day 3–7:

• Progressive weight-bearing as tolerated.
• Gait training begins.

Week 2–3:

• Cast changed (wound inspection, suture removal).
• New cast reapplied if wound is healing well.

Week 4–6:

• Transition to temporary (preparatory) prosthesis.

Week 6–12:

• Fitting of definitive prosthesis once stump volume stabilizes.

Advantages of IPOF

Disadvantages / Complications

Comparison: IPOF vs. Delayed Prosthetic Fitting

Types of Post-Operative Dressings (Comparison)

Special Considerations

In Diabetic / Dysvascular Patients

• More cautious weight-bearing protocol.
• Wound inspection at 48–72 hours mandatory.
• Modified IPOF with removable rigid dressing (RRD) preferred.

Pediatric Amputees

• IPOF very beneficial due to rapid adaptation and neuroplasticity.
• Growth must be accounted for in prosthetic planning.

Bilateral Amputees

• Staged IPOF; one side at a time.
• Balance training critical before independent ambulation.

Outcomes / Evidence

• Burgess et al. (1969): IPOF significantly reduced rehabilitation time and improved ambulation rates in below-knee amputees.
• Multiple studies confirm IPOF reduces phantom limb pain compared to soft dressings.
• Mooney et al.: Reported faster stump maturation and earlier definitive prosthetic fitting.
• Meta-analyses support IPOF for vascular amputees when wound complications are carefully monitored.
• Ambulation rates at 1 year: 70–80% with IPOF vs. 40–50% with delayed fitting in comparable groups.

Key Points for Exam

1. IPOF = prosthetic fitting in the OR immediately after amputation.
2. Ideal for below-knee (transtibial) amputation.
3. Key component: rigid POP cast + pylon + SACH foot.
4. Weight-bearing starts within 24–48 hours.
5. Major advantage: edema control + early ambulation + reduced phantom limb pain.
6. Major disadvantage: cannot inspect wound and risk of pressure sores.
7. Contraindicated in sepsis, infected wounds, non-compliant patients.
8. Cast changed at 2 weeks for wound inspection and suture removal.
9. Definitive prosthesis fitted at 6–12 weeks.
10. Introduced by Berlemont (1958), popularized by Burgess and Weiss.

Summary: IPOF is a well-established rehabilitation technique that applies a rigid prosthetic unit to the residual limb immediately in the OR. Its primary benefits are superior edema control, prevention of contractures, early ambulation, reduced phantom limb pain, and improved psychological outcomes. It requires a skilled multidisciplinary team and careful wound monitoring, but produces significantly better long-term functional outcomes compared to traditional delayed prosthetic fitting.

Clarification: What Is Being Used at Each Stage?

Stage 1 — IPOF (Day 0, in OT)

• Rigid POP cast (acts as the socket)
• Pylon (metal rod)
• SACH foot

The Full Timeline — Clarified

Why Is the "Week 4" Prosthesis Different?

• Cannot be adjusted easily
• Is not shaped to the final stump contour
• Is replaced as stump shrinks (hence cast changes at week 2–3)

• Reduced significantly in volume (edema resolved)
• Shrunk and shaped enough
• Healed the surgical wound

Simple Way to Remember

IPOF cast = emergency temporary measure (cast with a stick and foot)

Preparatory prosthesis (Week 4–6) = first real prosthesis with a fabricated socket

Definitive prosthesis (Week 6–12) = final permanent prosthesis