I see this regularly in clinic when patients come in months after an ankle sprain and the pain has moved from the ankle to the side of the foot. A patient walks in 8 to 12 weeks after a typical inversion sprain. They did everything right. The standard rehab is done, the ankle ligament is testing fine, the swelling and bruising are long gone. But the lateral side of the foot still aches with every push-off, every step on stairs, and any jog longer than a few minutes. Walking flat is okay for the first 10 minutes. Then the ache starts again. Their physiotherapist has been confused too.
If that sounds like your situation, the question worth asking is whether you are still dealing with the ankle sprain at all. The pattern fits cuboid syndrome, a small wedge-shaped bone on the outside of the foot that gets pulled slightly out of position during an inversion sprain and stays stuck there long after the original ligament damage has healed. It is a different problem from a lingering acute ankle sprain, and the management plan it needs is different too.
I see this every now and then in clinic, and that is because the pain has moved away from where the sprain originally hurt. The lateral foot pain looks like a new problem, not a sprain problem, so it does not always get linked back to the original injury. So here is how I help my patients work it out, in the order they usually ask the questions.
First, why has the pain moved to the side of my foot?
To explain that, it helps to know where the cuboid actually sits. Run your finger from the bony bump at the back of your foot (the calcaneus, your heel bone), forward along the outside of your foot toward the base of your smaller toes. About a third of the way along, the cuboid sits. It is a small wedge-shaped bone, jammed in between the heel bone behind, the bases of the 4th and 5th toes in front, and the navicular bone above.
The cuboid is held in position partly by the peroneus longus tendon, which wraps around its underside on its way to the inside of the foot. During an inversion ankle sprain, that peroneus longus tendon is working overtime to resist the rolling motion of the foot. The force transmitted through the tendon can pull the cuboid slightly out of its normal alignment, leaving it stuck in a partially displaced position. The original ankle ligaments heal. The cuboid stays stuck.
That is why the pain shows up in a location that does not match where the sprain itself was. The bone has been quietly out of position the whole time, and when the soft tissues around it settle, the displacement becomes the dominant pain pattern.
What specific spot should be hurting?
Lateral midfoot. Sit down with your foot on the floor and place your thumb on top of your foot, about a third of the way from the back of the foot, on the outside half. Place your other index finger directly underneath, on the sole of your foot in the same spot. Press your thumb and finger toward each other firmly. If that compression reproduces your familiar pain, the cuboid is on the differential.
The location is lower than the ankle and well below the sinus tarsi syndrome dimple I have written about elsewhere. It is also a different location to where peroneal tendonitis hurts, which is along the tendon line behind and below the outer ankle bone, into the lateral foot. Each of these conditions has a specific spot, and the spot is what tells me which one I am dealing with.
What movements should be hurting me?
Push-off is the standout. Cuboid syndrome flares as you transfer your weight onto the ball of your foot to step off. Stairs come second, particularly going up. Jogging hurts within the first kilometre. Walking on flat ground is often tolerated for the first 10 minutes, and then the lateral foot starts to ache. Cambered surfaces, like running on the same side of a road, make it worse than running on track.
What you usually do not get with cuboid syndrome is the giving-way pattern of a chronic ankle sprain. You do not roll the ankle. You just get a persistent ache on the outside of the foot, focused around push-off.
Why didn't my sprain rehab fix it?
The standard ankle sprain rehab is built around the lateral ankle ligaments. Calf raises, single-leg balance, peroneal strengthening, and progressive sport-specific drills. It is good rehab for a lateral ligament injury. But the cuboid is not a ligament. It is a small bone sitting in the wrong position. No amount of strengthening exercise will reposition it.
What cuboid syndrome actually needs is hands-on. A specific manual mobilisation manoeuvre (sometimes called the cuboid whip or cuboid squeeze) repositions the bone. Most patients feel near-immediate relief after the manoeuvre. After that, the foot is taped or padded to keep the cuboid in its corrected position while the surrounding tissues settle, and where ongoing foot mechanics are part of the cause, custom orthotics support the lateral column during walking and running so the cuboid does not drift back.
So the rehab was never going to fix it. The bone was in the wrong place. The fix is putting it back.
How is this different from sinus tarsi syndrome?
Both can show up after the same sprain, and they do sometimes coexist. The differentiator is location. Sinus tarsi syndrome hurts in the soft dimple in front of the outer ankle bone, 1 to 2 fingers below the bony bump. Cuboid syndrome hurts further down and forward, in the lateral midfoot, more like a third to halfway along the outside of the foot. The provocation tests are different too: sinus tarsi pain reproduces with direct pressure into the dimple, cuboid pain reproduces with compression of the bone between thumb and finger.
When they coexist, one usually dominates the symptoms. I work through both during the assessment to make sure neither gets missed.
Okay, what would you do this week if you were me?
If the pattern above sounds like your situation, the working diagnosis is cuboid syndrome. The next step is not more ankle rehab. It is a thorough clinical reassessment that specifically tests the cuboid: palpation of the bone, the compression reproduction test, and a full biomechanical evaluation of how your lateral column is loading.
The management plan changes accordingly. You need the manual mobilisation manoeuvre that repositions the cuboid, lateral-column taping to hold it there while the soft tissues settle, and where biomechanics call for it, a custom orthotic to support the lateral column going forward. Most patients notice meaningful improvement after the first treatment, with full settling over 2 to 6 weeks.
Where this is missed for too long, the cuboid stays displaced, the surrounding soft tissues become progressively more irritated, and the eventual recovery takes longer. Patients who arrive after six months of generic sprain rehab usually have more inflammation around the cuboid than patients who arrive at the eight-week mark.
If your ankle sprain has technically healed but the lateral side of your foot still aches with every push-off, book a consultation with any of our podiatrists in Singapore at any of our three locations. The earlier the cuboid gets repositioned, the faster the foot settles.
