Hi, I felt I had to tell my findings as it has helped me chill out and understand what is going on inside, the forces involved and to get realistic in the speed of my recovery. I naturally just want to get back to normal in weeks rather than months…
After my ATR I was scared as to what the future would hold. After reading links and blogs here I didn’t know what protocol my consultant would follow ( because I hadn’t meet him yet after the surgery) and if it would be right for me. I did meet the registrar who was at my operation and he said they made a really strong join ???
So I spent far too long reading blogs, links to research and articles on anything to do with ATR, what it did do was give me info to evaluate my situation.
Rerupture ? I’m 3 weeks post surgery and still in a cast as I write, but knowing what I have read I’m fine with being in a cast because it will stop me doing something crazy. So how much force do I need to re rupture my tendon ? We all recover at different speeds so lets look at immediately after my surgery.
They stitched my tendon together. There are various methods of stitch (Krakow, Kessler etc) but they appear in tests to be all pretty similar in strength. Tension Tests have been done to failure on repaired Achilles and no suture pulled out of the tendons. Failure was due to the suture snapping.
So how strong is the suture? More tests showed that the strength of the repaired tendon was proportional to the number of sutures crossing the join. So if your surgeon put two Krakow sutures it would be twice as strong as one. In one research paper, listed on this site, in tests a double suture to failure and it snapped with 46 Kg of force.
So how much force goes through the tendon? More reading but roughly it seems running can produce up to 8 times body weight and high explosive sports up to 12+ x body weight. So for an 80 kg guy we are talking roughly 1000kg of force. Your calf can produce up 1000kg force. Wow impressive!
If my surgeon did a double Krakow for example then any more than 46kg and I re rupture. Well that’s just 4.6% of my muscles capabilities! Suddenly I understand that I don’t want to get out of my cast too soon…. I can’t guarantee I won’t exert 5%..
Now I realize what the registrar meant by “we made a strong joint” I didn’t know what I do now so didn’t clarify how just how many sutures were a “strong joint”. We know there is minimal blood flow to the tendon so healing is slow. In the early weeks in my case I have just the sutures holding everything in place. Even if I had 3 sutures my repaired joint re ruptures at 69kg force that’s only 6.9% of the power of my calf! If I trip or push off in the wrong way it will be easy to exceed 6.9% = re rupture.
Without surgery I presume you have to be even more careful in the early days, before any natural healing has taken place, not to over stress the tear or rupture site. That’s not to say no WB on the heel but more the angle of the foot. So the UWO protocol of no dorsiflexion until after 6 weeks seems to me a very important point.
I don’t know if anyone has re ruptured while in a boot or cast? It seems to me that’s its once your foot is out of the boot you have to be very careful. Once I am in a boot I presume I can loose the crutches= Champagne time !
I may be completely wrong, but after understanding all of the above, I am happy to take things slowly. It has helped me relax and not push things too fast. Of course I want to get on two shoes asap and that’s why I have magnets wrapped around my ankle but that’s another story……