Category Archives: Component Reviews

Is the Patellar Bar Dead?: Review of the RCR (Now StabileFlex) below-the knee prosthetic socket from Coyote Design (Part 5)

Using the RCR method over the last few years has been a rewarding road of discovery. I have a better understanding of gait and normal anatomy. I have learned that the high tension cast in full extension gives me the best “snapshot” of the limb for comfort at midstance. I have also discovered that the problems I was having (distal tibia break down and alignment issues) have been cured with the RCR method. Patients love extra extension as well as flexion. I was surprised that even the relatively happy patients I already had were even happier when I switched them over to the RCR because of the increased freedom they felt. Lastly, I have been overwhelmed with the feedback from physical therapists saying that they are so impressed with the thoughtfulness of the design, and tell me they really never understood why there was a bar in the socket to begin with.

I believe that the RCR socket design and theory benefit ALL below-the-knee amputees. It is strange to think about not having a bar in a socket, but the time has come to say so long to the tradition and keep on developing socket designs that are relevant to the interface technology advances we now know. The RCR design and process is a systematic process which gives me confidence that I can make patients happy and comfortable in their prosthesis.

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Is the Patellar Bar Dead?: Review of the RCR (Now Stabileflex) below-the knee prosthetic socket from Coyote Design (Part 4)

I recently documented a case where a patient had worn out his Ossur Comfort 3mm locking liner in the patellar tendon area. He also had a dark calloused spot on his patellar tendon. I put him into an RCR socket and the patient was thrilled. Over the course of 4 weeks, the dark callous turned lighter and eventually to normal, supple, non-calloused skin. His gait pattern was more normal, and he felt uninhibited around his knee because there was no material hindering full extension. The cosmesis was better because the socket was lower profile with no anterior gapping. Lastly, he was ecstatic that he was able to bend his leg up to about 110 degrees under him, which made it easier for him to get his 6’4” frame out of a low chair.

Initial evaluation

Two weeks after initial fitting

4 Weeks After Fitting

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Is the Patellar Bar Dead?: Review of the RCR (Now StabileFlex) below-the knee prosthetic socket from Coyote Design (Part 3)

Dale’s conclusion is that with the advent of liners, I no longer need to load the patellar tendon. In fact, if I relieve the patellar tendon it is able to fully fire. Once I relieve the tendon, the quadriceps are allowed to gain strength and more normal extension is achieved at midstance. With these concepts, I, along with others, have hypothesized that this may be the missing link to a normal gait pattern rather than a “normal amputee gait pattern”.

Armed with my new-found knowledge, I went back at my office and tried it on my first, brave patient volunteer. The patient was in a socket with a very tight AP─so tight, that it actually caused a bulge in the popliteal area. He said he mostly just sat around because it was too painful to walk any distance. I casted him with the two-part high tension cast that the RCR mandates and had him weight bear through the cast. As he was putting weight through the cast, a smile crossed his face; this was the first time he was truly comfortable. I knew at that point not to do too much to the cast because I could mess up the fit. I followed the modifying instructions and enhanced my cast accordingly. The process did not take a great amount of time, and it gave me the confidence that I had a great fitting socket. The patient returned, and I was able to quickly align the prosthesis and allow the patient to leave on the copolymer check socket. I followed up with the patient in one week, and he had increased his activity level and kept telling me he was so amazed to not have pain. After this experience with the RCR, I knew that all my transtibial patients deserved to experience the comfort and freedom it offers.

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Is the Patellar Bar Dead?: Review of the RCR (Now StabileFlex) below-the knee prosthetic socket from Coyote Design (Part 2)

At the end of 2008, I needed a few extra continuing ed credits, so I decided to take one of the inaugural RCR courses at Northwestern University organized by OPGA. Two days before I left for Chicago, OPGA called to let me know that one of their “hands on participants” had cancelled, and they were looking for a volunteer to take the spot. I must admit, my first thought was “no,” but I realized that the worst that could happen was to fail miserably so I took the spot and have not looked back since.

Dale Perkins, CPO with Rehab Systems in Boise, ID challenged my conventional thinking as well as historical perspective of transtibial socket design with the development of the RCR socket. The socket design is a result of challenges he experienced by putting a patellar bar in his own prosthetic socket. Dale underwent a closed femoral shortening on his limb to even his knee center, as well as to get a better foot under his socket. One of the unintended consequences of the femoral shortening was that the quadriceps were now long, which meant he had to undergo quadriceps strengthening. He had no issues in his socket at the time of the surgery, however, as he gained strength, he realized his patellar tendon was starting to bother him. He evaluated his socket and decided to remove the bar and essentially relieved the tendon. He found that once the tendon was relieved, he was able to continue strengthening his quadriceps. He also found that he was getting more extension than he had previously achieved with the bar. With the added normal extension moment he was getting at midstance, his gait pattern improved as well.

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Is the Patellar Bar Dead?: Review of the RCR (Now StabileFlex) below-the knee prosthetic socket from Coyote Design (Part 1)

As a young, know-it-all prosthetist, I leaned over to my buddy and said in a sarcastic smug voice, “You’re kidding me right? These are the craziest trimlines for a BK I have ever seen; those shapes do not make any sense and would never work.” Over the next two years, however, I could not get my mind off of what I had seen, and I wanted to know more.

I enjoy reading a great deal of prosthetic historical literature, and I know that Charles Radcliffe, MS, ME pioneered many of the concepts that are still used today in below-the-knee prosthetics. His contributions are and continue to be extremely valuable to the field of prosthetics. I began to realize, however, that many of the theories behind the Patellar Tendon Bearing (PTB) prosthesis were actually created in the 1950’s─long before gel liners. Socket technology has not kept up with the designs and progression of new interface technology

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Component Review: The Plié Knee and Rush Foot a great combination

I am already a fan of the Rush Foot, if you did not see my video I did on fitting a bilateral transtibial amputee please check it out.  This is the 4th one I have used and the patients have raved about them.

I just recently fit Bobby, an extremely active person with a right transfemoral amputation.  He was walking on a Otto Bock C-Leg with a 1D35 foot.  He had been walking on the C-Leg for 7 years and did well with it.  When we tried the Plié knee from Freedom Innovations on him he was very specific about the things he liked about it.  He liked being able to walk backwards, walk really fast, and being able to reach above his head with both feet on the ground to grab something up high.  He told me that he felt more in control of how the knee was going to act.

The reasons he likes the Rush Foot from Ability Dynamics is obvious from the video.  I will not hesitate to use this combination again.

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Guest Post: Kevin McMahon, a transtibial amputee reviews the elan foot from Endolite

Mr. McMahon has generously given of his time to review the elan foot from Endolite. He feels as though it has greatly improved his ability to go up and down inclines but also given him a confidence that he has not had previously. Other feet he has tried have been the Trustep from College Park, Ceterus from Ossur, Echelon from Endolite, Proprio From Ossur, and now the elan.

Prosthetists will notice Mr. McMahon has an extremely strange alignment but it works for him. I will continue to make some minor changes to hone in his alignment but for the time being I can have been amazed at the increase in his activity level due to this foot.

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Patient Guest Post: Initial Impression on the ESP Seal-Tite Suspension Sleeve for a Below the Knee Prosthesis

This is a guest post of a patient of mine that has been wearing a prosthesis for a long time:

My first impression was that it seemed more substantial. It was thicker throughout and had a section of extra support around the knee. I have been wearing it now for about two months and find it to be substantially superior to the sleeves I have used before. I have had no leaks and I attribute that to that extra support around the knee which is where the bending and friction with my socket have always caused leaks.

It seems superior in holding the suction. The feeling that I am securely locked into my socket lasts a long time. When I feel a little “loose” it is a sign that I need to add a sock which when done returns me to full suction. I noted that I seemed to have less of a problem with sweat which I understand is also a result of the better suction.

In short, it is far and away the best sleeve I have experienced and can’t quite imagine what could be any better. One tip I have done that seemed to reduce the wrinkles in the back is actually turning the seem to the inside portion of the leg rather than up the back.

The sleeve is a ESP Seal-Tite Suspension Sleeve.

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Tired of feeling like a porcupine hugged you after grinding on carbon…check out new composite from Coyote Design…NO ITCH!

Tired of feeling like you have a porcupine in your shirt after grinding a carbon fiber prosthesis? Coyote Design has a new composite out that does not itch… and is flexible.

The RCR socket design from Coyote has always been most successful and most comfortable when the socket was flexible. In my experience I have had a patient love their copolymer test socket but not like their definitive carbon socket. The most common response when I make the switch back into a copoly socket is that it feels like it moves with them and is softer.

A complementary resin/composite combination has been the key to a flexible socket. Unlike other composites on the market the Coyote Composite is actually the simplest to work with. The lay-up for a normal below the knee socket with the Coyote Lock is two layers of multi-size nylon, 2 layers of composite, and two layers of multi-size nylon (reinforce distal end as needed). The composite will take pigment extremely well, and no extra nylons are needed to hide composite. When you grind the socket it does not itch and it finishes beautifully. So far my patients have loved the sockets.

If you want more information you can visit . If you want a couple insider tips on the resin and promoter we use, shoot me an email and I will let you in on a couple secrets.


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Adjustable Pylon from Kinetic Revolutions can now “grow” with pediatric above the knee or below the knee amputees

Kinetic Revolutions has released the third version of its adjustable pylon – the Pediatric. The Pediatric adjustable pylon can ‘grow’ as the patient grows. If you have used the pediatric adjustable pylon (or any of the family of adjustable pylons) let me know what you think of them. This looks like a slick component.

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