Your OS and probably your physios if you asked them as well will say the same - don't do full squats, they are not necessary and will damage your knee.Full squats such as you describe are a tremendous strain on a healthy uninjured knee. Your knee is no longer uninjured, even if it has been repaired. These types of squats are just not good for your knee which it is why it feels "wrong". The way in which the joint works has been altered for ever as a reconstruction can never exactly copy the original uninjured joint movement.By all means have full flex and use the standing heel to backside stretch for your quads as part of your warm-up and stretching routine. But doing a loaded full squat will result in damage to the meniscus and articular cartilage surfaces in your knee as the joint, even with the best of surgical placement, no longer works as it originally did.I have been repeatedly told over the years that the squats that I have to do as part of my training routine should not exceed 90° weight loaded. I use loaded held squats as part of my strength building exercise for skiing but I only go to a maximum of 90°. In skiing we are even more likely to unintentionally do a loaded squat to greater than 90° which is why there are so many busted ACLs in skiing and snow sports in general.You have full flex, I can't see how a fully weighted squat is part of the every day movement in a football match. Work on plyiometrics especially explosive changes of direction for the strength work and make sure your hamstring/quads strength is balanced.Sue
Oh boy, I get so tired of hearing these silly myths about full squats. There is absolutely no high quality evidence showing that full squats "should not exceed 90 degrees" and this is just a myth that is perpetuated by people who don't know how to execute a proper squat. Aside from the first few months following surgery, my OS and PT put no such restrictions on squatting for me and said to go right ahead with deep squatting after the 5 month mark.
sherwooa and your qualifications are?I take notice of my trained therapists, sports physicians and fellow coaches before any weirdo on the internet! As an experienced physical education teacher and high level sports coach, I can safely say I do know what I am doing. The reconstructed knee is never the same as an uninjured one and has to be treated differently. Full bum to heel squats, particularly weighted ones, put undue stress on a joint that has already lost elasticity and where the bio-mechanics of the movements will never be the same as pre-injury.