Artificial limb — rehabilitation of the elderly amputee

A prosthesis is a device that replaces a missing body part, in contrast to an orthosis, which is applied to the external surface of the body to provide support, improve function, or restrict or promote movement. Their design, construction and fitting require particular skill and technological expertise, and well-resourced rehabilitation centres include prosthetists and orthotists in the multidisciplinary team.

Most lower-limb amputations in older people are a consequence of peripheral vascular disease. Limb-threatening ischaemia is only occasionally due to a sudden embolic event; most patients have a long period of worsening ischaemia before amputation. Many are diabetic with coexisting cardiac and vascular disease, and others have smoking-induced chronic lung disease.

Despite this, rehabilitation has much to offer older amputees, and many rise to the challenge of walking even with bilateral below-knee prostheses.

Elderly amputees are nonetheless a high-risk group: perioperative mortality 10– 30%, two-year survival 40–50%, five-year survival 30–40% — and these rates have not changed significantly in the past 50 years despite better anaesthetic and surgical techniques.

Preservation of the knee is critical for proprioceptive and neuromuscular control and above all for minimising energy expenditure. It takes 40% more energy to walk with an above-knee (transfemoral) than with a below-knee (transtibial) prosthesis.

But do not over-reach for the knee. Injudicious efforts to salvage a knee joint can produce an ischaemic stump that fails to heal and later requires a more proximal amputation. A second procedure is potentially disastrous — it increases anaesthetic risk, prolongs immobility, increases deconditioning and delays entry into rehabilitation.

Stump management uses rigid removable dressings to reduce oedema, promote healing and protect against incidental trauma.

Early physiotherapy must strengthen the arms, abdominal muscles, lower back and the remaining leg — not merely the stump, because transfers and frame work depend on the upper body.

Prevent contracture from day one. For a below-knee amputee the full range of knee extension must be maintained — therefore avoid prolonged sitting without corrective exercises, and perform a minimum of 20–30 minutes of prone lying twice daily to promote full extension. In transfemoral amputees, guard against hip flexion and abduction contracture.

Stump conditioning: the skin contacting the prosthesis must become durable and toughened, best achieved by graded use of the prosthesis. Massaging the stump improves circulation and prevents adhesions during healing, and patients should be encouraged to do it themselves.

“Irrespective of age, prescription of a lower limb prosthesis is almost always indicated, even in the presence of other major medical problems.” Yet older amputees are less likely than younger ones to receive a prosthesis, even after adjusting for comorbidity and functional status — an ageism issue.

The prosthesis facilitates transfers, standing and walking, and has cosmetic value — the transfer benefit alone justifies fitting in many frail patients.

The old criterion is invalid. It used to be argued that an older amputee should demonstrate crutch-walking capacity before being offered a prosthesis. However, walking without bearing weight on the amputated side has a higher energy cost than walking on the prosthesis, so this criterion is invalid.

Respect patient choice. Some refuse a prosthesis and accept wheelchair mobility, but most older people — particularly those with few comorbidities — are happy with their prosthesis and use it well. A prosthesis should never be prescribed without considering each patient’s unique needs and wishes, and the demands of using it must be fully explained.

Prosthesis hygiene: stump socks should be washed daily with mild soap and warm water, rinsed thoroughly and dried flat, and the inner surface of the socket cleaned each evening with a warm soapy cloth.

Once a comfortable, stable and functional limb has been provided, the next stage is teaching the patient to walk on it properly — progressive weight transfer in parallel bars, then frame, then sticks.

Protect the remaining limb — it is the one that matters most. When peripheral vascular disease causes amputation, the remaining limb is often significantly ischaemic: 15–20% undergo contralateral amputation within two years and about 40% within four years. Viability can be enhanced by revascularisation surgery and by minimising vascular risk factors (poor diabetic control, smoking). Promote foot hygiene and avoid trauma, particularly by wearing appropriate footwear.

Comprehensive rehabilitation involves more than the provision of a prosthesis. Comorbidity, prosthetic component selection, and resettlement with tenuous or absent social supports all present formidable challenges.

Phantom limb sensation is normal and non-painful after amputation. Initially it can be so deceptive that the patient inadvertently attempts to walk on or scratch the missing limb. Over time the limb is felt to retract or “telescope” into the stump.

Phantom pain is a separate but perhaps related phenomenon affecting 50–80% of amputees. Pathophysiology is poorly understood, with central and peripheral nervous system factors plus psychological factors implicated. It is distinguished from stump pain because it is localised in the space vacated by the amputation, and is described as burning, crushing or lancinating; it may be continuous or intermittent, and the limb may be perceived as twisted or deformed.

Management of phantom pain is difficult. The first step is explaining the nature of the phenomenon to the patient. Patients with chronic pain before amputation have a higher incidence of phantom pain, but attempts to control pain before and during surgery do not consistently reduce it. There is little RCT evidence; reported improvement rates are little better than placebo. Anaesthetic and surgical techniques (local anaesthesia, sympathectomy, cordotomy) are as disappointing as pharmacological approaches. Tricyclic antidepressants and sodium-channel blockers are often used for their efficacy in neuropathic pain but are of no proven benefit. TENS provides modest relief at best, and patients need ongoing psychological help to develop coping strategies.

Nutrition detail: when calculating BMI in an amputee, add back the missing body-part percentage — single below-knee 6.0%, single at-knee 9.0%, single above-knee 15.0%, single arm 6.5%, single arm below elbow 3.6%.

VA/DoD Clinical Practice Guideline for Rehabilitation of Individuals with Lower Limb Amputation (2024) This 2024 update of the 2017 guideline directly modifies textbook practice:

“For prosthetic ambulators, we suggest prescribing microprocessor knee units over non-microprocessor knee units for reducing falls, optimizing functional mobility and improving patient satisfaction” (Weak for).

“We suggest energy storing and return (ESAR) or microprocessor-controlled foot and ankle components over solid ankle cushioned heel (SACH) feet to improve ambulation and patient satisfaction” (Weak for) — though there is insufficient evidence to prefer any specific ESAR or microprocessor foot over another.

“For patients with transfemoral amputation who meet eligibility criteria, we suggest osseointegration as an option to improve prosthesis use” (Weak for).

“We suggest intraoperative placement of a perineural catheter for postoperative delivery of local anaesthetic to reduce pain following amputation surgery.”

Insufficient evidence for or against targeted muscle reinnervation or other peripheral nerve surgery for phantom limb pain, and insufficient evidence for or against neurostimulation (peripheral nerve or spinal cord stimulation) or neuroablation (cryoneurolysis, radiofrequency ablation).

“We suggest using patient-reported and performance-based measures with acceptable psychometric properties to assess function” (Weak for).

Osseointegration — promising but not for the typical elderly amputee Osseointegration is a procedure in which a metal implant is directly anchored to the residual bone and attached to a prosthetic limb by a transcutaneous connector, an alternative to the socket-mounted prosthesis that has gained acceptance over the past 30 years. The VA/DoD “weak for” recommendation rests on very low confidence in the evidence quality, and on the fact that many clinicians are unfamiliar with the procedure because of limited access and training; the 2022 VA/DoD upper limb guideline found insufficient evidence either way. Crucially, candidates should not have diabetes, peripheral vascular disease or metabolic disease — which excludes the majority of elderly dysvascular amputees. A consensus statement on prehabilitation and rehabilitation of osseointegration patients was published in 2025, noting that protocols vary by implant system and institution.

Updated physiotherapy guidance and health economics The British Association of Chartered Physiotherapists in Limb Absence Rehabilitation (BACPAR) published the 3rd edition of its “Clinical guidelines for the pre- and post-operative physiotherapy management of adults with lower limb amputations” in 2025, incorporating new evidence and a 2024 Delphi consensus. A 2025 exchange in the Canadian Prosthetics & Orthotics Journal on the health economic evaluation of microprocessor versus non-microprocessor knees underlines that real-world cost-effectiveness data now drive reimbursement decisions — the practical barrier to microprocessor knees in most health systems, including India, is cost, not evidence.

Functional classification now drives component prescription (Medicare K-levels) K0 — no ability or potential to ambulate or transfer safely; a prosthesis does not enhance mobility K1 — transfers and ambulation on level surfaces at fixed cadence (household ambulator) → SACH or single-axis foot K2 — limited community ambulator, can negotiate low-level barriers (kerbs, stairs, uneven ground) → multi-axial or flexible-keel foot; increasing evidence for microprocessor knees K3 — community ambulator with variable cadence → ESAR foot, microprocessor or hydraulic knee K4 — high impact; child, athlete or active adult Most elderly dysvascular amputees are K1–K2, and the current shift is that K2 patients now benefit from components once reserved for K3.

India — the artificial limb landscape ALIMCO is India’s largest government-run prosthetic manufacturer, producing affordable artificial limbs, mobility aids and assistive devices distributed free or subsidised under the ADIP Scheme. BMVSS (Bhagwan Mahaveer Viklang Sahayata Samiti), the “Jaipur Foot” organisation, completed 50 years in 2025. It rehabilitated 88,467 people in 2022– 23 and fitted 40,078 limbs in 2024–25, and has provided over 2.5 million artificial limbs, calipers and other aids free of charge across India and 27 other countries. The Jaipur Limb uses an HDPE polymer custom-made socket linked to the specially designed Jaipur Foot, which is distinct from the SACH foot used in Western technology. The Jaipur Knee, developed with Stanford University, is generally added for above-knee amputees. A below-knee amputee with a Jaipur Foot can walk on even or uneven ground, run, sit, squat, climb, swim and dance — an above-knee amputee retains most of these functions. It is a rapid-fit limb, fabricated and fitted mostly within one or two days, light, durable and provided completely free, with no prior appointment needed (Aadhaar card and disability certificate required), including at on-the-spot fitment camps. The Jaipur/Stanford knee costs about US$20 to manufacture in India. In India, around 45,000 legs are estimated to be amputated every year, with major risk factors for diabetic amputation being lower-extremity ischaemia, neuropathy, previous foot ulcer, elevated HbA1c and retinopathy. Exam relevance: the ability to squat and sit cross-legged is the culturally decisive functional outcome in India, and this is precisely where the Jaipur Foot outperforms the SACH foot.

Prosthesis replaces a body part; orthosis supports, improves function, or restricts/promotes movement.

Peripheral vascular disease is the commonest cause of lower-limb amputation in the elderly.

Perioperative mortality 10–30%; 2-year survival 40–50%; 5-year survival 30–40% — unchanged for 50 years.

Above-knee walking costs 40% more energy than below-knee — save the knee where healing allows.

A failed knee salvage requiring re-amputation is disastrous.

Rigid removable dressings reduce oedema, promote healing and protect the stump.

Prone lying 20–30 minutes twice daily prevents knee flexion contracture in the trans-tibial amputee.

Early physiotherapy targets the arms, abdomen, back and remaining leg.

The crutch-walking prerequisite is invalid — walking without weight-bearing costs more energy than walking on the prosthesis.

Three components of a trans-tibial prosthesis: socket, shank, ankle-foot.

The socket determines comfort and stability and loads the patellar tendon; temporary sockets are needed until stump shrinkage is complete.

Exoskeletal shank = willow/balsa with laminated plastic; endoskeletal = carbon-fibre central pillar with a soft cover.

SACH foot = rigid ankle, compressible heel, light — ideal for the frail, short-stepping patient.

Wash stump socks daily and dry flat; clean the socket interior nightly.

15–20% lose the other leg within 2 years and ~40% within 4 years.

Phantom sensation is normal and non-painful; the limb “telescopes” over time.

Phantom pain affects 50–80%; it is felt in the space the limb occupied, unlike stump pain.

VA/DoD 2024: microprocessor knees over non-microprocessor knees; ESAR/ microprocessor feet over SACH.

Osseointegration is contraindicated in diabetes and PVD.

India: Jaipur Foot allows squatting, sitting cross-legged and walking on uneven ground.