was fit with a JaipurKnee when he was eight
years old, two years after being fit with his misaligned knee. In terms of impact, we know that
the knee is relatively affordable, stable, and fits
Amin’s needs, but also that his family remains in
significant debt from his first knee.
Creating a survey to assess a person’s quality
of life can be challenging. How do we put a
number to the struggles and triumphs of people
wearing a prosthetic knee?
In tracking amputees and their use of the
ReMotion Knee, it became clear getting a fuller
representation of people’s lives called for a blend
of quantitative and qualitative feedback. We
collect quantitative data to objectively assess
the efficacy of the medical device using stan-
dard mobility tests such as the 10 Meter Walk
Test and the Timed Up and Go Test. This data
allows us to compare the ReMotion Knee with
a patient’s previous device and see if a patient’s
mobility is improving over time.
Beyond mobility, amputees have told us
that they want independence, respect, and
self-reliance—critical components to maximiz-
ing impact that mobility metrics alone cannot
capture. So we also seek qualitative data,
particularly empathetic user feedback. User
stories and modifications also provide us with
critical contextual data on the product, so that
we can better address barriers to its adoption.
For example, early work on the original
JaipurKnee showed that social stigma is an
overarching issue for many amputees. We saw
users customizing their JaipurKnee to reduce any
noise it might make and to make the device look
more like a natural knee under clothing.
Part of the design challenge for the ReMotion
Knee is taking into account everyone in the
customer value chain who will interact with
CASE STUDY | ASSESSING THE IMPACT OF REMOBILIT Y
Iterative design insights to improve each version. Country names indicate where the design insight was learned.
- Being able to squat and sit cross-legged is critical in India.
- Polycentric knee mechanism is highly stable, mechanically simple, and reliable.
- With careful implementation, building the knee out of plastic instead of metal
could result in huge reductions in cost, but not in strength
HIGH RANGE OF MOTION (165
KINEMATIC DESIGN (USA)
NYLON MATERIAL (USA)
VERSION 2 (2010 - 2011)
- 2010 Disabled persons are highly stigmatized in many developing nations, leading many
patients to be sensitive to anything that calls attention to their disability.
- 2011 Most clinics around the world use a standard set of connectors to connect and assemble
prosthetic components into a full limb.
STANDARDIZED AT TACHMENT
SYSTEM FOR CONNECTORS
BUMPER THAT SOFTENS THE NOISE
MADE B Y THE KNEE WHILE PATIENT
IS WALKING (INDIA)
CURVED SURFACES (INS TEAD OF
SHARP CORNERS) THAT LOOK MORE
NATURAL UNDER PANTS OR A
VERSION 3 (2011 - 2012)
- 2011 Donated prosthetic components, while affordable, are difficult to source and take
considerable effort to manage. Reliability of supply, ease of ordering and predictable lead times
are just as important as an affordable price.
- 2012 Adoption and impact depend on patients and prosthetists recognizing the
knee as a desirable, quality product, not something that they are settling for as the
MODERN DESIGN AESTHETIC,
INCLUDING COMPLEX SURFACES
METAL SIDE BARS TO REDUCE
OVERALL WIDTH (CHINA)