01 · Research
Literature and products
Clinical studies set the targets (cane load 15–20% of body weight, grip diameter 30–40 mm, handle height ≈ 0.45 × user height). Smart canes on the market focus on navigation for blind users, not load feedback.
Design MethodsSemester 1 · 2025
A cane that talks back
A walking cane for elderly people with knee osteoarthritis that shows whether they’re loading it correctly.
Most elderly users with knee osteoarthritis under-load their canes or use them on the wrong side, because nothing tells them whether they’re doing it right.
15–20%of body weight on the cane reduces knee load
4 of 5users observed barely loading their cane
10–15 minbefore wrists and palms start to ache
02 · Field
Watching people walk
Field visits and interviews with elderly users and an orthopaedic doctor showed torn grips, worn tips, sore palms, and canes used as a light balancing stick, often in the wrong hand.
03 · Synthesis
Empathy and affinity mapping
Mapping turned observations into one problem: users need an intuitive, comfortable cane that gives real-time feedback on loading.
04 · Ideation
Morphology and sketches
A morphological chart combined handle shapes, shaft geometries and bases. Sketches explored grips that keep the wrist straight.
05 · Concept
Offset shaft, smiley feedback
A 15° offset shaft for load transfer, a contoured handle for wrist alignment, and a simple smiley/sad indicator showing whether pressure is right.
06 · Prototype
Full-scale foam model
Hot-wire cut, sanded and refined foam, tested for grip comfort and weight perception, then exhibited.
Outcome
The pre-final prototype validated form and grip. The project showed how a familiar aid can become a feedback device that teaches correct use.
Next
- Embed a load sensor and microcontroller for real-time feedback
- Haptic or visual cues tuned with physiotherapists
- Test with elderly users over weeks of daily walking
01 · Evidence
What the literature set
Before field work I collected clinical targets, so the design had numbers to aim for.
- Cane load 15–20% of body weight reduces the knee adduction moment
- Handle height ≈ user height × 0.45 (± 2 cm) avoids shoulder strain
- Grip diameter 30–40 mm spreads palm pressure
- Natural cadence with a cane: 85–95 steps a minute
- A research cane with vibration feedback raised loading from ≈9% to ≈17.6% of body weight
02 · Method
How I researched
Field observation with elderly cane users at home and in clinics, contextual interviews, and expert input from an orthopaedic doctor, then empathy and affinity mapping to make sense of it.
03 · People
Pain, fear and pride
Interviews surfaced more than ergonomics.
- Pain: after 10–15 minutes, wrists and palms hurt, sometimes more than the knee
- Use: canes treated as a light ‘balancing stick’, often in the wrong hand
- Fear: slipping on tiles and marble made people afraid to load the cane
- Pride: canes ‘make me look old’; one person wished it looked ‘modern, not like a hospital stick’
04 · Exploration
Morphology before sketches
Handle (hook, pistol, anatomical), shaft (straight, angled offset, organic curve), base (rubber tip, tripod, ball joint), feedback (visual, haptic, audio) and material were crossed in a chart. An anatomical handle, organic offset shaft, single rubber base and visual feedback came out strongest. SCAMPER and brainwriting fed the sketches.
What I learned
Takeaways
- 01Starting with clinical numbers gave every design choice something to be tested against.
- 02Field work showed the real problem was behaviour and emotion, not the lack of a walking aid.
- 03Empathy and affinity mapping turned scattered quotes into one clear problem statement.
- 04A full-scale foam model answered grip and balance questions that sketches and renders couldn’t.
- 05Dignity is a requirement: if it looks like a hospital stick, people won’t use it properly.