# Ankle Fracture

Assess neurovascular status and reduction urgency first, then determine mortise stability with appropriate radiographs and stress testing. Stable fractures can usually progress nonoperatively; talar shift, syndesmotic instability, or fracture-dislocation generally requires reduction and operative stabilization.

**Clinical question:** How should physicians identify instability, prioritize reduction, and select operative versus nonoperative management for acute ankle fractures?

Updated: 2026-08-24T17:40:06.577772+00:00

## What matters in practice
- Obtain ankle radiographs for malleolar pain plus posterior-edge/tip tenderness of either malleolus or inability to bear weight for four steps immediately and in clinical evaluation; the Ottawa Ankle Rules have high sensitivity for fracture detection. [9][10][11]
- Document dorsalis pedis and posterior tibial perfusion, sensation, skin compromise, and deformity before and after reduction; urgent open reduction is indicated when closed reduction fails or neurovascular deficit is present. [17]
- Medial clear-space widening greater than 4 mm or tibiofibular clear space greater than 6 mm on stress imaging supports syndesmotic instability and generally warrants stabilization. [9]
- A posterior malleolar or medial malleolar fracture with syndesmotic or medial clear-space widening should prompt tibia-fibula radiographs to exclude a proximal fibular Maisonneuve fracture. [16]
- After stable operative fixation, early protected weight bearing may be feasible, including in selected patients with trans-syndesmotic screws; postoperative loading should remain individualized to fixation stability, soft tissues, and surgeon protocol. [4][20][22]

## Identify fracture-dislocation and threats to the soft-tissue envelope

Reduction urgency is determined by alignment, skin, and neurovascular findings rather than fracture classification alone.

For visible deformity or suspected fracture-dislocation, examine and document dorsalis pedis and posterior tibial perfusion, capillary refill, motor function, sensory status, open wounds, and focal skin tenting before splinting or reduction. A dislocated ankle with threatened skin, vascular compromise, or neurologic deficit requires urgent reduction; urgent open reduction is necessary when closed reduction fails or neurovascular deficit is present. [17]

After reduction, repeat the neurovascular examination and obtain post-reduction ankle radiographs. Temporize an unstable fracture-dislocation with immobilization; when soft-tissue swelling makes immediate internal fixation unsafe, staged external fixation followed by definitive ORIF after soft-tissue recovery is an accepted pathway. Pin placement should avoid anticipated definitive surgical incisions. [17]

Do not localize the examination to the malleoli. Palpate the proximal fibula and assess for syndesmotic pain or mechanism suggestive of external rotation injury. A proximal fibular fracture may be clinically occult in patients presenting chiefly with ankle pain. [16]
- Treat as an open fracture pathway when a wound communicates with the fracture or joint; do not delay orthopedic assessment for definitive imaging.
- Escalate urgently for irreducible dislocation, absent or deteriorating distal perfusion, progressive neurologic deficit, or skin blanching/tenting over displaced bone. [17]

*Immediate management triggers for acute ankle fracture presentations. [17]*

| Finding | Interpretation | Next action |
| --- | --- | --- |
| Fracture-dislocation with skin tenting or threatened soft tissues | Risk of skin necrosis and conversion to an open injury | Urgent reduction, post-reduction neurovascular examination, immobilization, and orthopedic management. [17] |
| Neurovascular deficit | Limb-threatening complication or persistent displacement | Urgent reduction; urgent open reduction if closed reduction fails. [17] |
| Marked swelling with unsuitable operative soft tissues | Increased wound complication risk with immediate definitive fixation | Temporize, including staged external fixation when needed, then perform definitive ORIF after soft-tissue recovery. [17] |

## Use radiographs to determine fracture pattern and mortise stability

The central imaging question is whether the talus remains concentrically reduced within a stable mortise.

Obtain ankle radiographs when malleolar pain is accompanied by bony tenderness along the posterior edge or tip of either malleolus, or inability to bear weight for four steps both immediately after injury and at assessment. For midfoot pain, obtain foot radiographs when there is navicular tenderness, fifth-metatarsal-base tenderness, or inability to bear weight for four steps. The Ottawa Ankle Rules are highly sensitive and can reduce unnecessary radiography. [9][10][11]

Order anteroposterior, mortise, and lateral ankle views. The mortise view best evaluates the tibiotalar joint space and talar alignment; in adults, the clear spaces should be symmetric and no greater than 4 mm. Weight-bearing radiographs are preferred when tolerated because they can reveal subtle alignment abnormalities or joint-space widening not apparent on non-weight-bearing images. [9][16]

If initial films show a posterior malleolar fracture or displaced medial malleolar fracture without a distal fibular fracture, scrutinize the syndesmosis and medial clear space. Associated widening implies possible force transmission to the proximal fibula; obtain anteroposterior and lateral radiographs of the tibia and fibula to identify a Maisonneuve injury. [16]
- Use external-rotation or gravity stress radiographs when syndesmotic disruption is suspected and routine views do not establish instability. [9]
- MRI is most useful when persistent symptoms or clinical concern suggests ligamentous injury, syndesmotic injury, osteochondral injury, or tendon involvement despite nondiagnostic radiographs. [9]

### Radiographic instability markers

On stress imaging, medial clear space greater than 4 mm or tibiofibular clear space greater than 6 mm indicates syndesmotic instability. Significant widening generally supports surgical stabilization rather than isolated immobilization. [9]
- A widened medial clear space or syndesmotic gapping after fibular fixation should prompt intraoperative syndesmotic assessment. [14][18]
- External-rotation and lateral stress tests are used intraoperatively; the lateral stress test has been reported as more reliable for detecting syndesmotic injury. [14]

*Imaging findings that alter ankle-fracture management. [9][16]*

| Study or finding | Threshold or pattern | Management implication |
| --- | --- | --- |
| Ottawa Ankle Rules | Malleolar pain plus malleolar bony tenderness or inability to take four steps | Obtain ankle radiographs. [9][11] |
| Mortise radiograph | Asymmetric clear spaces or clear space greater than 4 mm | Evaluate for talar displacement and ligamentous/mortise instability. [16] |
| Stress radiograph | Medial clear space >4 mm or tibiofibular clear space >6 mm | Syndesmotic instability; surgical stabilization is generally indicated. [9] |
| Ankle radiograph with posterior or medial malleolar fracture but no distal fibular fracture | Medial clear-space or syndesmotic widening | Image the full tibia and fibula for Maisonneuve fracture. [16] |

## Separate stable fractures from an unstable ankle mortise

Treatment selection follows stability and soft-tissue status, not the presence of a fracture line alone.

A stable, concentrically reduced ankle mortise can be managed nonoperatively with immobilization and progressive weight bearing as tolerated. Stable nonsurgical fractures commonly return toward baseline function in approximately 6 to 8 weeks. [17]

ORIF is generally indicated for an unstable ankle mortise in patients fit for surgery when soft-tissue conditions permit. Fracture-dislocation, talar shift, unstable bimalleolar or trimalleolar patterns, and demonstrated syndesmotic instability are operative patterns because restoration and maintenance of a congruent mortise is the therapeutic objective. [17][21]

Timing should balance reduction and skin protection against wound risk. Definitive fixation is often performed within 24 hours, but can be delayed for several days when swelling requires soft-tissue recovery; a staged approach is appropriate when immediate definitive fixation would compromise wound healing. [17]
- Intraoperatively, assess syndesmotic stability after malleolar reduction and fixation; persistent gapping or medial clear-space widening on stress imaging warrants syndesmotic fixation. [14][18]
- Syndesmotic injuries occur in approximately 10% to 13% of ankle fractures. [14]
- Medial malleolar fixation may be selectively omitted after fibular stabilization in some unstable bimalleolar or trimalleolar injuries, but nonfixation has been associated with more radiographic nonunion despite similar reported ankle function; make this decision only after confirming stable reduction. [3]

*Stability-based management framework for ankle fractures. [9][17][21]*

| Clinical-radiographic branch | Key discriminator | Usual next step |
| --- | --- | --- |
| Stable fracture | Concentric mortise without demonstrated stress instability | Immobilization with progressive weight bearing as tolerated and interval clinical-radiographic follow-up. [17] |
| Unstable mortise | Talar shift, unstable bimalleolar/trimalleolar pattern, or syndesmotic instability | Orthopedic operative planning for ORIF when soft tissues permit. [17][21] |
| Syndesmotic instability | Stress medial clear space >4 mm or tibiofibular clear space >6 mm | Syndesmotic stabilization during operative treatment. [9] |
| Fracture-dislocation with unacceptable soft tissues | Persistent instability plus swelling or skin risk | Reduction and temporizing stabilization; definitive fixation after soft-tissue recovery. [17] |

## Advance loading after fixation according to construct stability and soft tissues

Routine prolonged non-weight-bearing after every fixation is increasingly difficult to justify, but not every construct has been studied equivalently.

Traditional care after ORIF of unstable ankle fractures with syndesmotic screw stabilization has often used 6 to 8 weeks of non-weight-bearing. A case series reported full weight bearing within 15 days after ORIF with trans-syndesmotic screws without loss of reduction, hardware failure, or increased complications, supporting early protected weight bearing in selected patients. [4]

Randomized and observational evidence summarized in recent reports supports earlier mobilization after stable operative fixation. A multicenter randomized trial comparing immediate protected weight bearing with casted non-weight-bearing reported better 6-week Olerud-Molander scores (43 versus 35) and better early ankle range of motion in the immediate-weight-bearing group. [20] A 2025 retrospective cohort found no statistically significant difference in complications across early, intermediate, and delayed weight-bearing groups after ankle ORIF. [6][22]

Prescribe loading only after the treating surgeon confirms acceptable reduction, construct stability, and wound status. Delay or restrict weight bearing when the fixation construct, postoperative radiographs, soft tissues, or patient-specific capacity to comply makes early loading unsafe; the literature and postoperative protocols remain variable. [5][22]
- At follow-up, reassess wound integrity, alignment, pain trajectory, ankle motion, and interval radiographs before advancing activity.
- Counsel that even anatomically reduced and stabilized ankle fractures can lead to post-traumatic ankle arthritis; one estimate is approximately 14%, attributed in part to chondral injury sustained at fracture. [17]

*Postoperative loading evidence after operative ankle-fracture fixation. [4][6][20][22]*

| Scenario | Evidence signal | Practical decision |
| --- | --- | --- |
| Stable ORIF construct | Immediate protected weight bearing improved early functional scores and range of motion in a multicenter randomized trial. [20] | Consider early protected loading when reduction, fixation, and wound status are satisfactory. |
| ORIF with trans-syndesmotic screws | A case series reported full weight bearing within 15 days without reduction loss, hardware failure, or increased complications. [4] | Early protected weight bearing can be considered selectively rather than assuming mandatory 6- to 8-week non-weight-bearing. |
| Variable fracture complexity or surgeon concern about fixation/soft tissues | Postoperative protocols remain variable despite studies not showing a significant short-term complication difference by weight-bearing timing. [5][6][22] | Individualize restrictions and obtain interval radiographs before progression. |

## Detect loss of reduction, wound failure, and late joint consequences

Follow-up should test whether the ankle remains congruent and whether rehabilitation progression is outpacing tissue recovery.

After nonoperative treatment or ORIF, compare serial radiographs for maintenance of mortise congruity and fixation position, and examine the incision or fracture blisters for wound dehiscence or infection. Escalate new deformity, worsening pain, neurovascular change, or radiographic displacement to the operating surgeon because these findings may represent loss of reduction or fixation failure.

Persistent pain, instability, or limited recovery after apparently healed fracture should trigger a focused reassessment for syndesmotic injury, osteochondral injury, tendon injury, or post-traumatic arthritis. MRI is the most sensitive modality for ligamentous tears, syndesmotic injuries, osteochondral defects, and tendon involvement when those diagnoses remain clinically plausible. [9]

Functional recovery is not synonymous with radiographic union. Stable nonoperative fractures may approach baseline function by 6 to 8 weeks, whereas unstable injuries requiring ORIF may recover more slowly because of greater tissue injury and immobilization; monitor return to walking, range of motion, and work-related function alongside imaging. [17]
- Use new medial clear-space widening or syndesmotic gapping as a signal to reassess ankle stability rather than treating persistent symptoms as uncomplicated postoperative pain. [9][14]
- Discuss post-traumatic arthritis risk during longitudinal follow-up, particularly after injuries with substantial articular or chondral trauma. [17]

*Findings during follow-up that warrant a change in management. [9][14][17]*

| Follow-up finding | Concern | Next step |
| --- | --- | --- |
| New deformity, worsening pain, or radiographic displacement | Loss of reduction or fixation failure | Urgent orthopedic reassessment and repeat radiographs. |
| Wound dehiscence, increasing drainage, or infection concern | Postoperative wound complication | Prompt surgical wound assessment and management. |
| Persistent pain or instability with nondiagnostic radiographs | Syndesmotic, ligamentous, osteochondral, or tendon injury | Obtain MRI when the result will clarify the suspected soft-tissue or osteochondral diagnosis. [9] |

## References
1. Morphological characteristics of spiral tibial shaft fractures ... — www.nature.com — https://www.nature.com/articles/s41598-025-19668-2
2. Effect of early weight bearing on rehabilitation in ankle fractures with syndesmotic injuries | Scientific Reports — www.nature.com — https://www.nature.com/articles/s41598-025-18920-z
3. Nature Index Ankle Fracture Management and Treatment Techniques — www.nature.com — https://www.nature.com/nature-index/topics/l4/ankle-fracture-management-and-treatment-techniques
4. Early Protected Weightbearing After Open Reduction Internal Fixation of Ankle Fractures With Trans-syndesmotic Screws - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S1067251620300041
5. Weight-bearing timing after the operative management of ankle fractures: Single center audit and critical appraisal of literature - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S1067251624002424
6. Early weight bearing is not associated with short-term complications in ankle fractures - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S1067251625000134
7. Early weight bearing and mobilization decrease perioperative complications in patients after ankle fracture; the retrospective multicenter (TRON group) study - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S0949265822000689
8. JBJS Search — www.jbjs.org — https://www.jbjs.org/sso.php?state=o%3Dlogout%26r%3Dhttps%253A%252F%252Fwww.jbjs.org%252Fsearch.php%253Ftype%253Dimagegroup%2526a_title%253Dankle%252Bfracture
9. Acute Ankle Sprain - StatPearls - NCBI Bookshelf — www.ncbi.nlm.nih.gov — https://www.ncbi.nlm.nih.gov/books/NBK459212
10. Ottawa Ankle Rules and Subjective Surgeon Perception to Evaluate Radiograph Necessity Following Foot and Ankle Sprain - PMC — pmc.ncbi.nlm.nih.gov — https://pmc.ncbi.nlm.nih.gov/articles/PMC4071746
11. IMPLEMENTATION OF OTTAWA ANKLE RULES IN UNIVERSITY HOSPITAL EMERGENCY ROOM: PILOT STUDY — pmc.ncbi.nlm.nih.gov — https://pmc.ncbi.nlm.nih.gov/articles/PMC10592341
12. MRI Evaluation of Ligamentous Injury in Weightbearing-Stable ... — pmc.ncbi.nlm.nih.gov — https://pmc.ncbi.nlm.nih.gov/articles/PMC12534871
13. Clinical Value of the Ottawa Ankle Rules for Diagnosis of Fractures in Acute Ankle Injuries — pmc.ncbi.nlm.nih.gov — https://pmc.ncbi.nlm.nih.gov/articles/PMC3640009
14. Ankle Dislocation - StatPearls - NCBI Bookshelf — www.ncbi.nlm.nih.gov — https://www.ncbi.nlm.nih.gov/books/NBK554610
15. Clinical value of the Ottawa ankle rules for diagnosis ... — pubmed.ncbi.nlm.nih.gov — https://pubmed.ncbi.nlm.nih.gov/23646202
16. Ankle Radiographic Evaluation - StatPearls - NCBI Bookshelf — www.ncbi.nlm.nih.gov — https://www.ncbi.nlm.nih.gov/books/NBK557462
17. Ankle Fracture - StatPearls - NCBI Bookshelf — www.ncbi.nlm.nih.gov — https://www.ncbi.nlm.nih.gov/books/NBK542324
18. Open Reduction Internal Fixation of a Bimalleolar Ankle ... — pubmed.ncbi.nlm.nih.gov — https://pubmed.ncbi.nlm.nih.gov/27441940
19. Immediate Improvement in Physical Function After ... — pubmed.ncbi.nlm.nih.gov — https://pubmed.ncbi.nlm.nih.gov/32433196
20. Fracture Care Is at the Heart of Orthopaedic Surgery - OrthoBuzz — orthobuzz.jbjs.org — https://orthobuzz.jbjs.org/2025/07/17/fracture-care-is-at-the-heart-of-orthopaedic-surgery
21. Study Details | NCT03362229 | Medial Malleolus: Operative Or Non-operative | ClinicalTrials.gov — clinicaltrials.gov — https://clinicaltrials.gov/study/NCT03362229
22. Early Weight Bearing Is Not Associated with Short-Term Complications in ... — www.sciencedirect.com — https://www.sciencedirect.com/science/article/pii/S1067251625000134
23. The effect of time to post-operative weightbearing on functional and clinical outcomes in adults with a displaced intra-articular calcaneal fracture; A systematic review and pooled analysis - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S0020138318300809
24. Operative Versus Nonoperative Treatment for Displaced Intra-Articular Calcaneal Fractures: A Meta-Analysis of Randomized Controlled Trials - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S1067251616000363

## Editorial note

Prepared from cited clinical literature using Astra's research workflow. Verify recommendations against current guidance and patient-specific factors.