Incorrect crutch fitting is one of the most common and preventable causes of upper limb injury in mobility aid users. This guide walks through every measurement, adjustment, and technique required for a safe, comfortable fit.
Why Correct Fitting Matters
A forearm crutch that is set even a few centimetres too high or too low can dramatically alter gait mechanics, increase energy expenditure, and place injurious load on the wrists, elbows, and shoulders. Research published in clinical rehabilitation literature consistently identifies poor crutch fitting as a modifiable risk factor for secondary musculoskeletal injury yet in practice, many patients leave hospital or a clinic with crutches that have never been properly measured to their body.
The following protocol mirrors the fitting assessment used by occupational therapists and physiotherapists in Australian rehabilitation settings, adapted for self-managed use at home.
Step-by-Step Fitting Protocol
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Wear your usual footwear Always perform fitting measurements in the shoes or orthotics you will routinely wear when using your crutches. Heel height significantly affects the optimal crutch length.
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Stand in your natural posture Stand as upright as possible with arms relaxed at your sides. Avoid slouching or compensating posture caused by pain. If you cannot achieve a reasonable upright stance, seek clinical assistance first.
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Set the handle height The handle should align with the crease of your wrist (the distal wrist crease) when your arm hangs naturally. When you grip the handle, your elbow should flex to approximately 15–20°. This small bend allows for shock absorption through the arm during the gait cycle.
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Position the forearm cuff The cuff should encircle the forearm approximately 5–7 cm (2–3 inches) below the tip of the olecranon (elbow point). When walking, the cuff should remain in contact with the forearm throughout the swing phase but allow easy release when you open your hand.
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Check cuff tightness The cuff should be snug but not constrictive. You should be able to slide two fingers comfortably between the cuff and your forearm. A cuff that is too tight can impair circulation; one that is too loose provides inadequate control.
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Confirm the rubber ferrule contact Place the crutch tip approximately 15 cm to the side of and slightly in front of your foot. The shaft should be vertical or very slightly angled outward. If the shaft angles significantly inward, the handle may be too high.
Common Fitting Errors and Their Consequences
Crutch Too Tall
When the handle is set too high, users compensate by elevating the shoulder girdle during each step. Over days to weeks, this produces chronic trapezius and levator scapulae tension, and significantly increases compressive load through the acromioclavicular joint. Users often also shift their trunk laterally to accommodate an overly long crutch, creating asymmetric gait patterns that can contribute to lumbar pain.
Crutch Too Short
An under-height crutch forces the user into a forward-flexed trunk posture, placing the centre of mass in front of the base of support. This is particularly hazardous on inclines and stairs. It also concentrates load at the palmar surface of the hand rather than distributing it through the forearm cuff, leading to wrist extension strain.
Cuff Positioned Too High
A cuff sitting near or above the olecranon restricts elbow flexion and can apply direct pressure to the radial nerve, particularly during extended use. Paraesthesia (tingling or numbness) in the fourth and fifth fingers is a warning sign of cubital tunnel compression that should prompt an immediate reassessment.
Reassessing Your Fit Over Time
Crutch settings should be reviewed at each significant change in footwear, following any change in weight greater than 5 kg, during growth periods in paediatric users (typically every 6–8 weeks), and any time pain or discomfort develops during use. The push-button adjustment mechanism on FDI forearm crutches allows rapid height modification without tools. There is no reason to persist with an ill-fitting setting.
Gait Patterns: A Brief Overview
The appropriate gait pattern for forearm crutch use depends on the nature of your condition and any weight-bearing restrictions prescribed by your surgeon or physiotherapist. The most common patterns are the three-point gait (for non-weight-bearing or partial weight-bearing on one limb) and the two-point or four-point gait (for bilateral lower limb involvement or balance conditions). Your rehabilitation team will specify the correct pattern for your presentation. Do not change gait pattern without clinical guidance.
Need correctly fitted, height-adjustable crutches? Browse VidaStride's forearm crutch range, where every model offers tool-free height adjustment. Read next: Upper Limb Health While Using Crutches.