Previous Next


Agung was managing a construction site when he was fit with his ReMotion Knee, and the knee gave him the mobility and confidence to traverse unstable, uneven terrain and ride his scooter to and from job sites. For more about Agung, including a video of him walking with his ReMotion Knee, click here.


Kamal was the very first patient to be fit with a JaipurKnee. Previously, Kamal used a bamboo staff to get around. Using the staff caused spinal misalignment and severely calloused hands. After being fit with the JaipurKnee, Kamal got a job at BMVSS serving patients waiting for treatment—a job his previous assistive device would have not have permitted him to do.

Sonu Kumar

Sonu Kumar hurt his leg in a traffic collision in 2008, and was fit with a JaipurKnee at BMVSS when he was 20 years old. He’s an electrician and was able to almost double his income (from 2,500 RS/mo. to 4,000 RS/mo.) after receiving his JaipurKnee. Watch Sonu ride a bike here.


Andres lost his leg in a motorcycle accident, but despite the accident he remains a motorcycle enthusiast. Before being fit with his Jaipur Knee, Andres would ride using his crutch on the peddle. Andres was determined to take advantage of the physical therapy offered to master his new prosthetic.


Vishamber was 13 years old when he was walking by the side of the road and got hit by a truck. Since being fit with his JaipurKnee in 2009 at BMVSS, Vishamber has been able to participate in the daily activities of his family, including farming. Much of Vishamber’s income after his fitting went towards loan repayments for his amputation surgery.


Purnima was 18 years old and studying to be an engineer when she was in a car accident that killed her younger brother and took her right leg. After her surgery, Purnima and her father traveled over 12 hours by train to the BMVSS clinic where she was fit with her JaipurKnee. After receiving her knee, she planned to return to school and complete her degree.


Eight-year-old Amin lost his leg in a 2009 collision while riding on the back of his father's motorcycle. He arrived at BMVSS in 2011 wearing a leg unit that was difficult to use and too heavy for Amin's frame. As he practiced his first steps after being fit with the JaipurKnee, Amin smiled shyly and told us, "This feels comfortable." Within hours, he was walking smoothly.

Mr. Rajindra

Mr. Rajindra was 16 when he was hit while riding on the back of a motorcycle and lost his leg. Before being fit with his JaipurKnee, he wore an exoskeletal knee for 15 years. Mr. Rajinda arrived at BMVSS wearing a stern expression, but a quiet smile lit up his face when he first put on his Jaipur Knee. Shortly after being fitted with his knee, Mr. Rajindra got a job as an electrician.


The vast majority of the 1 million above-knee amputees living in low- and middle-income countries who need prosthetics each year do not have access to the devices they need to live more healthy, productive lives.

D-Rev’s intervention

By designing a low-cost, high-quality prosthetic knee that can be delivered through an economically self-sustaining distribution model, D-Rev aims to increase the availability and accessibility of quality prosthetics in underserved regions, and improve the health of amputees as a result.

Measuring impact

To measure our progress in reaching amputees who need access to quality prosthetics, we track three main indicators:

  • Number of amputees fit
  • Number of amputees fit who otherwise would not have been fit with a comparable knee
  • Countries where ReMotion Knees have been sold

During our clinical field trials, we also track the following:

  • Percentage of amputees fit who continue to wear their knee for a significant period of time after fitting (“Compliance Rate”)
  • Percentage of amputees who report experiencing no mechanical failures of their knee (“Non-failure Rate”)
  • Percentage of amputees fit who report being satisfied with their knee (“Satisfaction Rate”)

For a detailed description of the assumptions and calculations we use to measure impact, check out our step-by-step explanation.

Quick Facts

Goal: Empower amputees through provision of low-cost, high-quality prosthetics

Project started: 2008
First prototype (JaipurKnee) launched: 2008
ReMotion Knee field trials: 2011-14
ReMotion Knee launch: 2015
ReMotion Knee re-launch: 2017 (expected)

Current status: ReMotion Knee officially launched in late 2015. During 2016, sales were paused for additional fine-tuning of device. Sales are expected to resume in mid-2017.

Product manager: Rob Weiss