Got a medical question? Let me stretch my brain.

Originally Posted by kayaker

I'll give ya a whirl Cyanide.

My right knee has no ACL or medial meniscus. I don't have any trouble with the stability of my knee. It has never "popped" again, and it doesn't limit my ability to be active when I want to. I can play squash, hike, climb, etc. I didn't get ACL replacement as I felt it unnecessary.

However, I have noticed over the last year or so that it takes greater effort to get up from a crouching position and my knee aches a little more than usual. It's not a big deal, but I'm not getting any younger.

Would the ACL replacement surgery help with this?

Hey Ian;

The knee is kind of funny, in that there are a number of conditions that can look identical in symptomology. And further, they respond equally well to conservative therapies. But, once they start not conforming to said therapies, then you have to get specific in order to approach the surgical options. That's where MRIs come in.

But, it was reasonable to not repair the ACL, and it may be reasonable to now re-examine the issue to see if things should be approached differently now.

All that said, in the military I find many a soldier with your exact story. Heck, my knee is almost identical in story as well. What it probably boils down to in this case is something called Patellofemoral Pain Syndrome, also known as Chondromalacia Patellae. This is where the knee-cap doesn't track through the groove at the end of the femur (upper leg bone), and as a result gets torn up pretty bad. It leads to stiffness and pain after long periods of sitting (this is called the "moviegoers sign"). What is causing this mis-tracking is a mis-alignment of the tibia (lower leg bone) in relation to the knee. This in turn is commonly cause by fallen arches (either obvious; or "dynamic" where you only see the collapsing inwards when you shift from non-weight baring to weight baring). As the foot collapses inwards, the tibia is slightly angled inwards, meeting the femur at the knee at a slight angle. Now the kneecap tries to jump-rail when the leg is straightened.

I commonly see this in knees where some of the other structures are damaged. This decreases your "physiologic reserve" to compensate for the fallen arches (by simply pulling everything into place through brute strength) and the mal-alignments are allowed to unveil themselves.

So, what do you do?

1) Increase that physiologic reserve by a) strengthening all the muscles groups or b) repairing that ACL (but you can't repair the meniscus)

2) grab some good sturdy orthotics (I find generic, off the shelf ones are best because they are relatively cheap which makes it easy to replace when they wear out, roughly at the same rate as a pair of running shoes), and have a look at how old the soles of your shoes are. People find their knees start to hurt more as their shoes age.

When you get back to Edmonton here I will have a look.

Cheers

John