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Floating position facilitates reduction in Bosworth fracture-dislocation compared to prone approachA Rare Ankle Injury That Doctors Often Miss at First

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Key Takeaway
Consider utilizing a floating position intraoperatively to facilitate exposure and avoid reduction failure in Bosworth fracture-dislocation.

A case report and literature review examined a 56-year-old male patient presenting with a Bosworth fracture-dislocation. The intervention involved open reduction and internal fixation via a posterolateral approach. The study compared an initial prone position approach against a subsequent revision surgery utilizing a floating position with the patient in a floating position.

The primary outcome assessed the success of releasing entrapped fibula and reducing the distal tibiofibular syndesmosis. In the floating position approach, successful release of the entrapped fibula and reduction was achieved in the single patient. Conversely, the initial prone position approach was associated with reduction failure, characterized by persistent proximal fibular entrapment.

No adverse events, serious adverse events, discontinuations, or specific tolerability data were reported. Key limitations include the rarity of this injury leading to high clinical misdiagnosis rates, hidden entrapment pitfalls specific to this injury type, and the restriction on obtaining true intraoperative standard lateral radiographs when using the prone position. The study design involves only one patient, which limits the generalizability of the results.

Early diagnosis is crucial for this condition. Early open reduction should be performed when closed reduction proves difficult. Utilizing a floating position intraoperatively helps ensure adequate exposure and facilitates standard lateral x-rays to avoid reduction failure.

The injury that likes to hide

His injury is called a Bosworth fracture-dislocation. It is rare, and it is sneaky.

In this injury, a piece of the fibula (the smaller bone on the outside of your lower leg) breaks. But it does not just break. It slips behind a ridge on the other leg bone, the tibia, and gets stuck.

Ankle sprains and breaks are some of the most common injuries in emergency rooms. Most heal well. But this variant is different. It often looks like a regular ankle fracture on a quick X-ray, so doctors may miss it.

When it gets missed, patients can end up with long-term pain, arthritis, and trouble walking.

Old thinking vs. what we know now

For a long time, many ankle injuries were treated with a simple "pop it back into place" move, called closed reduction. Doctors would pull on the foot and guide the bones back together, then put the leg in a cast.

For most ankle breaks, that works fine.

But here's the twist with a Bosworth fracture.

The broken piece of fibula is physically trapped behind part of the tibia. No amount of pulling or twisting from the outside can pop it free. In fact, trying too hard can make things worse.

This new case report argues that doctors should stop repeating failed attempts and go to surgery sooner.

Think of a key stuck in a lock

Imagine a key that has slipped sideways inside a lock. You can wiggle it, push it, and turn it all you want. It is not coming out unless you open the lock itself and lift the key free.

That is what this fracture is like. The bone fragment is the key. The ridge on the tibia is the lock. You have to open things up to get it out.

This is why the surgery matters more than usual, and why the way the patient is positioned on the operating table turns out to be a big deal.

What the surgeons tried

The team first tried two closed reductions while the patient was still awake or mildly sedated. Both failed.

So they moved to surgery. They placed the patient face-down (called the prone position) and opened the ankle through a cut on the back and outer side.

They put plates and screws in place. The X-rays in the operating room looked okay. They closed him up.

But after surgery, better imaging showed the fibula fragment was still trapped. The reduction had failed, even with open surgery.

This is the moment the case turned.

What they found the second time

The surgeons went back in. This time, they used what is called a floating position. The patient is placed so the leg can be moved more freely during surgery.

That small change made a big difference.

In the floating position, the team could get clear side-view X-rays during the operation. They could use gravity to gently pull the leg and open up space around the stuck bone. They could actually see the fibula slip back into its proper place.

After the second surgery, the ankle was stable. Over time, the patient regained good function.

In plain terms: the first surgery looked successful but was not. The second surgery, with a better setup, truly fixed the problem.

Why the position on the table matters

The case report makes a simple but important point. When a patient lies face-down, it is hard to get a true side view of the ankle with the X-ray machine during surgery. That means hidden problems can stay hidden.

The floating position gives the surgical team room to tilt, rotate, and image the ankle from the correct angles. It is not a new tool or a new drug. It is a smarter way to use what operating rooms already have.

Sometimes the fix is not fancier technology. It is a better setup.

If you or a loved one has a serious ankle injury after a fall, especially one that will not pop back into place easily, this case is a gentle reminder: ask questions.

Ask your doctor if a CT scan has been done. A regular X-ray may not show the full picture. CT scans are much better at spotting a Bosworth-style injury.

Ask whether all the bones are truly back in place, not just aligned "closely enough."

This doesn't mean every ankle break needs surgery. Most do not. But the rare ones that do need it, need it done right the first time.

The honest limitations

This is a single case report. That means it describes one patient and one surgical team.

One case cannot prove that the floating position is better for everyone. It cannot tell us how often Bosworth fractures are missed in general hospitals. And it cannot replace larger studies.

Still, rare injuries often get understood one careful case at a time. Each report adds a piece to the puzzle.

The authors, writing in Frontiers in Medicine, call for more awareness of this injury among emergency doctors and orthopedic surgeons.

More training, earlier CT scans, and a lower bar for open surgery when closed reduction fails could all help. Future studies may compare surgical positions in larger groups of patients to confirm what this single case suggests.

For now, the takeaway is simple. A rare injury deserves a careful eye, the right imaging, and a surgical plan that does not settle for "close enough."

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedApr 2026
View Original Abstract ↓
IntroductionBosworth fracture-dislocation is a rare and specific variant of ankle injury. Its insidious radiographic features frequently lead to a high clinical misdiagnosis rate. Furthermore, the entrapment of the proximal fibular fracture fragment behind the posterolateral tibial ridge or the posterior malleolar fragment makes closed reduction exceptionally difficult.Case presentationThis report presents the case of a 56-year-old male patient admitted with swelling and deformity of the right ankle following a fall. The diagnosis of a Bosworth fracture-dislocation was confirmed via clinical history, standard radiographs, and computed tomography imaging. The patient required surgical intervention after two failed preoperative manual reduction attempts. Initially, open reduction and internal fixation were performed via a posterolateral approach with the patient in a prone position. However, postoperative imaging revealed a failed reduction characterized by persistent proximal fibular entrapment within the posterior malleolus. Following thorough communication, a revision surgery was performed through the original incision with the patient in a floating position. This approach successfully released the entrapped fibula and reduced the distal tibiofibular syndesmosis, achieving stable fixation and ultimately leading to satisfactory functional recovery.DiscussionThe failure of the initial surgery highlights the hidden entrapment pitfalls associated with this specific injury. The prone position restricts the ability to obtain true intraoperative standard lateral radiographs, increasing the risk of unrecognized persistent subluxation. Adopting a floating position effectively overcomes these limitations by providing ample spatial clearance for real-time fluoroscopic monitoring and utilizing gravity for gentle axial traction, thereby ensuring the definitive visual release of the entrapped fibula.ConclusionBosworth fracture-dislocation is a rare injury that is easily misdiagnosed, making early diagnosis crucial. When closed reduction proves difficult, early open reduction should be performed. Utilizing a floating position intraoperatively helps ensure adequate exposure of the fracture site and facilitates standard lateral x-rays, which is an important strategy to avoid reduction failure.
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