A Small Wrist Bone Losing Its Blood Supply, With No Injury to Blame
Central wrist pain, stiffness and weakening grip, building over months, in someone in their twenties or thirties who never actually injured it?
How does that even happen?
That combination is unusual enough to be worth naming, because it doesn’t fit the normal pattern.
- There’s no fall to explain it,
- the pain isn’t dramatic, and
- nothing shows on an early X-ray?
Kienböck’s disease is the lunate, one of the small carpal bones sitting in the middle of your wrist, gradually losing its blood supply and collapsing.
It is treatable, and what you can preserve depends almost entirely on how early it’s found.
Which is a problem, because the early stage is the stage that looks like nothing.
What’s happening
The lunate sits in the middle of the first row of carpal bones, directly under the end of your radius, taking load every time you push through your hand.
Its blood supply is precarious.
In some people it comes in through only one small vessel rather than two, which leaves no backup if that vessel is disrupted.
Once blood flow drops, the bone starts to die.
- It softens,
- then flattens,
- then collapses
The bones around it shift to fill the space, the carpal alignment changes, and arthritis follows.
There’s also an anatomical risk factor worth knowing about: people whose ulna sits slightly shorter than their radius put more load through the lunate with every push.
That difference is a barely a few millimetres, visible on an X-ray, and it’s part of why some surgical treatments work by evening the two bones up.
Who gets it, and what it feels like
Typically 20 to 40, more often men, usually the dominant hand, and often someone doing manual work or using vibrating tools.
- A deep ache in the center of the back of the wrist, gradual over months.
- Stiffness, particularly bending the wrist backwards.
- Grip strength dropping, which people often notice before the pain bothers them.
- Tenderness when you press right in the middle of the back of the wrist.
- No injury, or a trivial one that doesn’t explain months of symptoms.
Wrist pain with no story behind it, in a young hand, that’s still there at three months. That’s the version worth imaging properly.
The imaging point
This is the practical thing to take away.
In the earliest stage, X-rays are normal. The bone is dying but hasn’t changed shape or density yet, so there’s nothing for the film to show.
MRI picks it up at that stage, and it’s the only thing that will.
So a normal X-ray in someone with this pattern does not settle the question, and a wrist that’s been sore for months with a clean X-ray deserves a scan rather than more patience.
By the time changes are visible on plain films, the bone has already hardened or started to flatten, and the treatment options have narrowed.
Treatment, and what each stage buys
Broadly, the earlier the stage, the more the aim is to save the bone. The later the stage, the more it becomes about managing a wrist that has already changed shape.
- Earliest stage: unload it. Splinting or casting for a period, activity and tool changes, and close monitoring. Some cases genuinely stabilise here.
- Middle stages, bone dying but not collapsed: procedures that reduce load through the lunate, most commonly shortening the radius slightly so the two forearm bones sit level, or attempting to revascularise the bone.
- Late stages, collapse and arthritis: salvage operations. Removing a row of carpal bones, or fusing part of the wrist. These reduce pain reliably and cost permanent movement.
Hand therapy runs alongside all of it: maintaining range, protecting the wrist during activity, adapting tools and grips, and rebuilding strength after surgery.
Honest note on outcomes: this is a condition where results are less predictable than most things on this site, and where surgeons genuinely disagree about the best treatment at some stages.
Getting a second opinion here is reasonable rather than awkward.
The short version
Deep central wrist pain and stiffness building over months, in a younger hand, with no injury behind it and a normal X-ray.
That’s the pattern to push on. Ask for an MRI rather than accepting the X-ray, because in this one condition the difference between finding it early and finding it late is the difference between saving a bone and fusing a wrist.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Tens of thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. Wrist pain that’s been present for months without a cause needs proper imaging.