Prosthetic/Orthotic Fitting

Prosthetic/orthotic fitting is a rehabilitation procedure in which a specialist designs, builds, and adjusts an artificial limb (prosthesis) or a supportive brace or splint (orthosis) to restore movement, reduce pain, or improve function after injury, disease, or limb loss.

A prosthesis replaces a missing body part — most often an arm or a leg — so the person can perform everyday tasks again. An orthosis does not replace a part; instead, it supports, corrects, or protects a limb or the spine that is still present. Both devices work by redistributing forces across joints and muscles, reducing strain on weakened or damaged tissue, and allowing the nervous system (the network of nerves controlling movement) to relearn movement patterns through regular use.

This procedure is used whenever a person has lost a limb or has a body part that can no longer move or bear weight properly on its own. The fitting team — usually a physiatrist (a rehabilitation medicine doctor), a prosthetist/orthotist (a specialist who designs the devices), and a physiotherapist — assesses each patient individually before recommending a device.

• Limb amputation caused by diabetes-related complications, peripheral artery disease (poor blood flow to the limbs), trauma, or cancer
• Stroke (a brain attack that interrupts blood flow) causing weakness or paralysis of an arm or leg
• Cerebral palsy (a movement disorder present from birth or early childhood) affecting limb control
• Spinal cord injury causing partial or complete paralysis of the legs
• Foot drop — weakness of the muscles that lift the front of the foot — from nerve damage or neurological disease
• Scoliosis (an abnormal sideways curve of the spine) in children or adults who are not yet candidates for surgery
• Osteoarthritis (wear-and-tear joint disease) or rheumatoid arthritis (an immune system attack on the joints) causing severe knee or ankle instability
• Sports or accident injuries to ligaments (tough bands connecting bones) that leave a joint unstable
• Congenital limb differences (limbs that did not develop fully before birth)

A prosthesis or orthosis may not be suitable in every situation. Doctors generally weigh up several factors before proceeding.

• Wounds or skin infections at the site where the device would fit — fitting is usually delayed until the skin has healed
• Very poor circulation in the residual limb (the remaining part of an amputated limb), which could make socket fitting dangerous
• Severe cognitive impairment (significant memory or thinking problems) that would make safe device use very difficult
• Active, uncontrolled heart or lung disease that prevents participation in the rehabilitation training required alongside the fitting

Prosthetic and orthotic fitting does not involve surgery or anaesthesia, so serious medical risks are uncommon; most issues are related to fit, skin tolerance, and the body's adjustment to the device.

• Skin irritation, blisters, or pressure sores (areas of damaged skin from prolonged pressure) at points where the device contacts the body — the most frequent problem, especially in the first weeks
• Socket or brace discomfort when the residual limb changes size due to swelling, weight gain, or weight loss, requiring refitting
• Contact dermatitis (a skin rash caused by a reaction to the device material or liner)
• Muscle fatigue and joint pain while the body learns to use the new device, particularly during early training
• Falls or minor injuries during the learning period, especially with lower-limb prostheses
• Phantom limb pain (pain felt in the part of the limb that has been removed) — this is a nervous system response and is not caused by the prosthesis itself, but fitting and use can influence it
• Psychological distress related to adjusting to a changed body image or the demands of rehabilitation
• In rare cases, abnormal loading of the prosthesis can put extra stress on the opposite limb, the hip, or the lower back over many years of use

Unlike surgical procedures, prosthetic and orthotic fitting does not usually require fasting, stopping most medications, or any special preparation on the morning of the appointment. However, there are important steps in the days and weeks before the first fitting session.

If the fitting follows an amputation, the rehabilitation team will usually work on preparing the residual limb first. This includes exercises to strengthen the muscles, bandaging or using a shrinker sock (a firm elastic sleeve) to shape and reduce swelling in the stump (the end of the remaining limb), and keeping the skin clean and intact. Patients who smoke are typically encouraged to reduce or stop, because smoking slows skin healing and circulation — both important for a good fit. Alcohol is generally best avoided in the days around any rehabilitation session.

Before a device is made, the care team usually carries out several assessments:

• Physical examination of the residual limb or affected joint, including skin condition, muscle strength, and range of motion (how far a joint can move)
• Circulatory assessment — sometimes using Doppler ultrasound (a painless sound-wave test) to check blood flow in the limb
• Neurological check to assess sensation (feeling) and nerve function
• Gait analysis (watching and recording how the person walks) where relevant
• Review of X-rays, MRI, or CT scans already taken for the underlying condition
• A detailed conversation about the patient's daily activities, work, and personal goals, which guides the choice of device type

The fitting process itself usually unfolds over several visits rather than a single session. Here is a typical sequence, though the number of steps and visits varies between patients and centres:

• 1. Assessment and measurement — the prosthetist or orthotist takes precise measurements and often makes a plaster or digital cast (a three-dimensional shape) of the limb
• 2. Trial socket or trial device — a temporary test version is made from clear plastic or lightweight materials so the fit can be checked and adjusted
• 3. Alignment and balance check — the patient stands and, where possible, walks with the trial device while the specialist observes and makes fine adjustments
• 4. Definitive (final) device fabrication — once the trial fit is confirmed, the permanent device is built using the chosen materials (carbon fibre, thermoplastic, silicone, and others depending on the device type)
• 5. Final fitting and training — the finished device is fitted, and the patient begins supervised training with the physiotherapist to learn how to put it on, take it off, and use it safely
• 6. Review appointments — follow-up visits are scheduled to check skin condition, comfort, and function, and to make any further adjustments

Recovery and adjustment after prosthetic or orthotic fitting is an ongoing process rather than a single event. Most patients do not stay in hospital overnight for the fitting itself; it is usually done on an outpatient basis. However, for patients who have recently had an amputation or major surgery, the fitting may be part of an inpatient (in-hospital) rehabilitation programme. How long adjustment takes varies greatly — it depends on the type of device, the underlying condition, the patient's general health, and how consistently training is done.

• Wear time is gradually increased: most specialists recommend starting with short periods of use each day and extending this over weeks to allow the skin to toughen and the muscles to strengthen
• Skin checks should be done every time the device is removed — look for redness, blisters, or sores; if any appear, the device should not be used until a prosthetist or doctor has reviewed the fit
• Proper hygiene of the residual limb and the device liner (the soft inner layer) is important to prevent infection and skin breakdown — the care team will give specific instructions
• The socket or brace may need adjustment as body weight or limb volume changes; patients are usually asked to contact their prosthetist rather than try to alter the device themselves
• Physiotherapy sessions continue after fitting to build strength, balance, and confidence with the device; attendance is important for achieving the best result
• Follow-up appointments are typically scheduled at regular intervals in the first year, then less frequently; the device itself will need periodic professional inspection and eventual replacement
• Lifestyle adjustments may be recommended, such as wearing appropriate footwear, managing body weight to maintain consistent limb volume, and modifying certain high-impact activities while adjusting
• Psychological support or peer support groups (connecting with others who use similar devices) can be helpful during the adjustment period and are available at many rehabilitation centres