04/28/2026
A lot of ACLers hear “isometric” or “leg extensions” and panic like it’s some scary exercise that’s going to stretch their graft.
It’s not.In fact, isometrics and leg extensions often place less strain on your ACL than things you’re already doing.
Yep, that’s right, there’s more strain placed on the graft when Walking, doing Stairs and Squats.
But you may also have not realized that:
A quad set is a form of Isometric.
Holding the top of a box step-up: Isometric.
Holding the bottom of a step-down? Isometric.
Pausing in a split squat? Isometric.
Wall sits, Isometric.
You’re probably already doing some form of isometrics.
I use leg extension isometrics early in ACL recovery because they’re safe, effective, and a great way to load the quad without asking for a ton of movement.
And honestly, they’re often way more effective than endless straight leg raises, especially for my quad /patellar tendon graft girls.
I do want to normalize some front-of-knee discomfort that can happen and that can make you think something is wrong. It doesn’t mean damage! A lot of times your knee just needs graded exposure to the movement to build tolerance & you’ll find when you do that, it starts feeling better! Just like walking for the first time didn’t feel very good..but did you avoid it? No, you made adjustments and progressed it until you walked normally. Same thing here!
The right dose at the right time can build strength, confidence, and tolerance early . You shouldn’t avoid something based on fear and/or someone’s beliefs…
Comment ISOMETRICS for my guide on the why behind using them and how I use them with my clients 💜