This box squat was primarily devised to build up concentric strength at a given depth, as you had no rebound elastic effect once stopping. You can naturally also use to ensure you do not sink below a certain depth, and thereby protect the knee by limiting the depth and angles. In relation to the knee issues, I have been trying wall slides and Cossack squats with support, to experience a fuller ROM that is better for the muscles and joints all-round, generally speaking, as oyu get a full stretch with wt. My ACL is still in tact. but my lateral meniscus is wiped out, so my ACL is at risk, and I do collapse sideways on that weak side and go over. I'm thinking of adding a band to these exercises somehow, so I am having to use adductors and abductors, to improve lateral strength as I squat. I think it was Boyle in Functional Training for Sports who went into the angles of the shin, the knee, and ACL tears. If you can't do the book, maybe he has some videos on You Tube. He states on P 188 that 2 main focuses for ACL need to be: single-leg strength, both conc and ecc, and landing and deceleration skills. Injuries he says occur when athlete is too weak and tries to land or change direction. Sometimes it can be physiology, usually in women. He advocates a strength programme, and a plyometric progression., and conditioning for CoD. Some authors say important to learn how to land, and have minimal amt of strength before Plyo, which can be highly demanding, although this is debatable he says. Balance hip and knee exs, taking strain off knees with more glute activation, and use linear and lateral exercises, as latter will give more strength and control in moves that strain the ACL through lateral CoD moves. Boyle in this book also explained how the knee joint works, and why he does not advocate going below a certain angle, although he did say one benefit of a full squat s the internal rotation of the hip joints, and the increase in strength of a muscle when it is used in full ROM. He did say this full squat can cause knee damage for some, esp'y when used with wt, so I'm gingerly trying full squats with no weight, but adding wt to other exs, mostly single leg, or staggered stances. One progression with say hops or bounds, could be to start with only a slight deviation from the central line of direction, then gradually increase the lateral movement and deviation from the centre, thus putting more load in lateral direction. I would build the adductors and abductors up first though, such as monster walks and that kind of thing

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I'm thinking the same thing, and I would imagine it depends upon your own goals, and any restrictions. Like a lot of people I am not sure what my knees issues are, but I ran, worked carrying loads up steps, and played football and squash, so there's some movements patterns there to give me a guide to what went wrong, and how to correct it. If you're young, you're probably focused on regaining or optimising the movement pattern that is specific to your sport, whereas some people just wish to live a healthier pain-free life. At 63 I'm kind of in-between, as I wish to recoup some of my former sporting attributes, but be healthy too, with far less pain, and a far greater ROM. Thus, I think the greater the range and weight in that range we can do, the fitter, more flexible and mobile, and more robust we are, and so this approach can be remedial too. What I'm doing then is a bit of both, with body weight wall slide squats and Cossack squats with support to develop a little strength with increased some range of motion, again but with light weight to monitor any knee reactions and angles, whilst trying different types of squats and hinges with some weight on, and trying different shin angles. Naturally, I'm trying other movements too to build up my strength and flexiibility holsitically, and take the strain off the knee, such as straight leg deadlifts, glutes exs, dorsi and plantar flexion of feet and lower leg muscles (see kneesovertoes guy), good mornings, flexing knee and hyperextensions of back. Then add foam work and stretches, ice packs, wax heat treatments, and any other therapeutic helps. Personally, I really like the idea of increasing one's strength in as greater ROM as possible for most muscles, or combinations of them. That's why I bought supple as a leopard, but still as stiff as a plank at the moment. Hopefully in a year or so I'll see some real results, as coming back from serious illness. So all I'm saying is, what are your goals, and why, then seek out methods to fulfil those. May I wish you well with that!!!

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One of the negatives of a box squat is that some people take the weight off their body by resting on the box as he mentioned, although this method can be used for those who wish to improve their concentric strength from inertia in the chosen angle that is provided by the height of the box. For those who wish to use the box squat as a means of limiting the angle of the knee, to protect it, then obviously you choose a pre-set height that you are comfortable with, which is your reference point. Without the box, you are guessing, although if you use a mirror, this may help somewhat, so depends on why you wish to use the box really, and how precise you wish to be. For someone with real knee issues, setting the box at a specific height can help them in recovery, and allows a progression, as they very gradually lower the box.

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I've read that muscles and jts can literally lock in a well-used position, and this leads to a lack of flexibility, then injury. Maybe it's do with the fascia too, as Kelly keeps harping on about that. Still unsure abut these postulations wrt knee and squat depths and shin angles, although I can see benefits of a vertical shin, but I sense we would nearly all benefit from greater RoM in many movements, but perhaps, like in a full squat, we are just not meant to use heavy load. See kneesovertoes guy. That's the principle I'm currently working on anyway, despite knee issues, which I think are caused mostly by serious overuse in ranges of movement that were limited, and greatly upset the balance between the anterior and posterior muscles in my legs, causing pain in my tendons and destroying my ant tibs. Balance is the key then. By the way, Doug Brignole goes into science of stresses and angles of various moves, and whether they are good for you, or not, and maybe that's where you got your info? But if not, his book is still a good read for those who like the science of lifting.