Ankle dorsiflexion is the shin travelling forward over a planted foot. That is the whole movement. You use it on every step downhill, on every stair, in the second half of every running stride, and all the way to the bottom of a squat — which is why a small number at the ankle turns up as a change in shape somewhere else entirely.
It is also the reading people are most confident about and least careful with. There are two versions of the test, they read different tissue, and two accepted ways of measuring the same ankle give numbers that do not convert into one another.
The short answer
- Dorsiflexion is the shin moving forward over the foot, not the foot moving up towards the shin — though both close the same angle.
- Knee bent and knee straight are two different readings. Bending the knee slackens the gastrocnemius and leaves the soleus and the joint itself.
- Weight-bearing and non-weight-bearing measurements do not agree. A degrees figure from a plinth is not a centimetres figure from a wall.
- A full squat took about 38° of dorsiflexion in measured subjects. Most desk-bound adults have less.
- A low absolute reading has some prospective association with knee tendon problems. A left–right gap has almost nothing behind it.
- That restoring dorsiflexion prevents injury has not been shown. Anyone claiming it has is ahead of the evidence.
What ankle dorsiflexion is
Take the angle between your shin and the top of your foot and close it. That is dorsiflexion, and it happens two ways.
Sitting, with the foot in the air, you pull the foot up towards the shin. Standing, with weight through the foot, the foot stays put and the shin travels over it. The angle closes either way, but the load through the joint and the number you get out are not the same.
Almost everything you care about happens in the second version. Walking downhill, descending stairs, squatting, standing out of a low chair, catching yourself on uneven ground — all of it is the shin travelling over a planted foot, differing only in load and degree.
That is why the standard self-test is taken standing, with weight through the foot. The knee-to-wall test has you drive the knee forward over a planted foot with the heel down and measure how far back the foot can sit — a centimetres reading, one side at a time. How to take the knee-to-wall test sets out the protocol and the scale.
Knee bent and knee straight
Two muscles make up most of the calf, and they cross different numbers of joints.
The gastrocnemius starts above the knee, on the back of the thigh bone, and runs down into the Achilles tendon. It crosses the knee and the ankle. Straighten the knee and it is on stretch before the ankle has moved at all.
The soleus starts below the knee, on the back of the shin bones, and joins the same tendon. It crosses the ankle only. Bending the knee does not change its length.
So bending the knee takes the gastrocnemius out of the equation and leaves the soleus, the joint capsule and everything else at the back of the ankle. That is not a subtlety. It is the difference between two readings that are both correct and both incomplete.
The knee-to-wall is taken with the knee bent, deliberately, because that is the position a squat and a stair actually use. A knee-straight measurement — standing with the back leg long, or lying with the knee extended — reads the gastrocnemius line instead, and it is the one that matters for the late stance phase of a running stride.
Both belong in a record. Neither substitutes for the other. In Limber's catalogue the two live as a pair: M051 Wall Calf Stretch, Straight Knee and M052 Wall Calf Stretch, Bent Knee, both 40-second holds, both per side.
Why two measurements disagree
Bring a physiotherapist's number to a wall test and the two will not match. That is expected.
Dill and colleagues compared weight-bearing and non-weight-bearing dorsiflexion measurements in the Journal of Athletic Training in 2014 and found they do not agree. They behave as two different readings rather than two views of the same one. Weight-bearing measures more, because body weight and a hand on the wall push the joint further than a hand on a foot does, and because the whole back of the ankle is loaded rather than passively lengthened.
Grade: solid, and narrow. The disagreement is well shown. Which of the two is the "true" ankle is not a question either measurement answers.
The practical rule falls straight out. Pick one method and stay with it. A number taken lying down in January and a number taken against a wall in April will differ by more than most training produces, and the difference will be the method.
Setup moves the same ankle too: where the tape is anchored, whether shoes are on, how hard the knee is driven, whether the heel is truly flat. Published averages for healthy adults cluster somewhere around 9 to 11 cm on the wall test and shift with all of that.
It is worth knowing how thin the normative base is. Soucie and colleagues published normal joint range by age and sex in Haemophilia in 2011, drawn from 674 people aged 2 to 69 — one of the better datasets of its kind, and still 674 people spread across 67 years of age and split by sex. Grade: reasonably solid for the method, thin as a personal benchmark. Treat any norm as a rough neighbourhood, not a pass mark.
What a low reading predicts
Two prospective findings sit behind this, and both are about a low number rather than a difference between sides.
Backman and Danielson followed junior elite basketball players for a year in the American Journal of Sports Medicine in 2011 and found low ankle dorsiflexion associated with developing patellar tendinopathy. Malliaras, Cook and Kent reported reduced dorsiflexion in volleyball players with patellar tendinopathy in the Journal of Science and Medicine in Sport in 2006.
Grade: moderate, and specific. Two sports, jumping athletes, one tendon. Both point at a low absolute reading, not at a gap between your two ankles. If you take something from them, take the number itself rather than the difference.
The mechanical case is stronger than the clinical one. Macrum and colleagues artificially restricted ankle dorsiflexion in healthy people in the Journal of Sport Rehabilitation in 2012 and watched the squat change immediately: less knee travel, more forward trunk lean, altered muscle activation. That is a controlled demonstration that the ankle governs the shape above it.
Grade: solid mechanically, weaker clinically. That a restricted ankle changes squat mechanics is well shown. That the changed mechanics hurt anybody is not.
For scale, Hemmerich and colleagues measured hip, knee and ankle kinematics during high-range daily activities in the Journal of Orthopaedic Research in 2006 and found a full squat took roughly 95° of hip flexion, 155° of knee flexion and about 38° of ankle dorsiflexion. Thirty-eight degrees is a great deal more than most adults who sit for a living have available. Deep squat mobility works through which of those three joints tends to run out first.
Where the evidence runs out
Here is the claim this page will not make.
That restoring ankle dorsiflexion prevents injury has not been shown. No trial has taken a group with restricted ankles, raised their range, and demonstrated fewer injuries afterwards. The association studies are associations. The mechanical studies are mechanics. Neither is a prevention trial, and the prevention trials that exist for stretching in general have not gone our way — Pope and colleagues randomised 1,538 army recruits to calf stretching before exercise in Medicine & Science in Sports & Exercise in 2000 and found no meaningful reduction in injury.
Grade: absent for prevention. Anyone selling ankle work as injury insurance is ahead of the evidence, and this site is not going to join them.
What the reading is good for is narrower and still worth having. It needs a wall, it repeats, and it tells you whether the ankle is part of why your heels lift in a squat.
A pinch at the front is different
One restriction gets treated as a calf problem and is not.
If the limit at the end of the range is felt as a pinch at the front of the ankle — a hard, blocking, slightly bony sensation just in front of the joint line — that is usually not tissue length at the back. It is the front of the joint running into itself, and stretching the calf harder does not address it. Neither does holding the pinch longer, which tends to irritate the joint.
A stretch felt low in the calf or at the back of the ankle is the test working. A pinch at the front is a signal to ease out. The app's own ankle rocking movement, M011 Wall Ankle Dorsiflexion Rock, carries exactly that instruction: ease off if there is pinching at the front of the ankle.
Pain that persists, wakes you at night, radiates into a limb, comes with numbness or weakness, or followed a fall or an injury is a matter for a clinician who can examine you. So is an ankle that gives way, an ankle you cannot put weight through, and one calf that is swollen, hot or noticeably larger than the other. Nothing here diagnoses anything and nothing here is treatment.
How to get a number
Two readings answer most of what people want from this.
Take the knee-to-wall test for the ankle itself: both sides, centimetres, about two minutes. Then take the deep squat test for what the ankle is doing to the movement above it: one reading, four bands, captured as a thirty-second hold. The pair separates a squat that stops because of the ankle from a squat that stops for some other reason, which no single reading can do.
Write both down with the date, and take them again in three weeks under the same conditions. Then the drills, which are graded honestly in ankle mobility drills — including the review that says static calf stretching moves this number by only a few degrees. The wider cluster is hips and legs.
Questions
What is a normal amount of ankle dorsiflexion?
On the wall test, published figures for healthy adults cluster somewhere around 9 to 11 cm, and they move with how the test is set up — where the tape is anchored, whether shoes are worn, how hard the knee is driven. Degrees taken by a different method do not convert into that, so there is no single normal to quote across both. Treat any published figure as a rough neighbourhood rather than a threshold, and note that the best normative dataset in this area covers 674 people across 67 years of age. The number worth having is your own, taken the same way twice, weeks apart.
Why does bending my knee change the reading?
Because the two calf muscles cross different joints. The gastrocnemius starts above the knee, so straightening the knee puts it on stretch before the ankle moves; the soleus starts below the knee and is unaffected by it. Bending the knee therefore takes the gastrocnemius out and leaves the soleus and the joint. Both versions are worth recording, and neither replaces the other.
Is limited dorsiflexion why my heels lift in a squat?
Very often, though the squat itself cannot tell you — it sees ankles, knees, hips and lower back at once. Restricting dorsiflexion in healthy people changes squat mechanics immediately in controlled experiments, which is a good reason to measure the ankle rather than assume it. Take a knee-to-wall reading on both sides and you will know whether the ankle is part of your answer.
Does poor dorsiflexion cause injuries?
Low dorsiflexion has been associated with patellar tendinopathy in two prospective studies of jumping athletes, which is an association in a specific population, not a cause in everyone. No trial has raised anyone's dorsiflexion and shown fewer injuries afterwards. The honest summary is that a low reading is worth knowing about and is not a diagnosis.
Should I worry if one ankle reads lower?
Only if the difference survives a second measuring session on another day. The published error on the wall test is about a centimetre to two, and on Limber's scale a centimetre is worth five to ten points, so a small gap is as likely to be your foot placement as your ankle. The better-supported finding concerns a low absolute reading rather than a difference between sides.
What if the front of my ankle pinches instead of stretching?
Ease out of it. A pinch at the front of the joint is usually not a calf-length problem, and stretching harder or holding longer tends to irritate the joint rather than change the range. A stretch felt low in the calf or at the back of the ankle is the movement working as intended. If the pinch is painful, recurring, or came after an injury, see a clinician who can examine the joint.