Classification for post malleolus fracture
Reading File
Finding Sources
Finding Sources
Searching PubMed
posterior malleolus fracture classification
Reading File
Finding Sources
Reading File
Reading File
I now have all the detailed information needed for a complete, authoritative answer. Here is the full classification for posterior malleolus fractures:
Classification of Posterior Malleolus Fractures
Posterior malleolar fractures occur in approximately one-third of all ankle fractures. Plain radiographs are limited for defining these fractures because both orientation and configuration are variable. Three CT-based classifications are in common use: Haraguchi (2006), Bartonicek (2015), and Mason (2017).
1. Haraguchi Classification (2006) - First CT-based system
| Type | Description | Frequency |
|---|---|---|
| Type 1 | Single posterolateral fragment; fracture line runs obliquely from the incisura fibularis to a point behind the medial malleolus | ~66% |
| Type 2 | Extends to involve the medial malleolus; usually multifragmentary | ~20% |
| Type 3 | Small shell/avulsion fragment of posterior malleolus | ~14% |
- Type 2 has been shown to have a worse prognosis.
- Haraguchi considered a fracture anterior to the transmalleolar line to be a pilon fracture (excluded from this system).
2. Bartonicek Classification (2015) - More detailed stepwise severity system
| Type | Description | Approx. Frequency | Preferred Management |
|---|---|---|---|
| Type 1 | Extraincisural; intact fibular notch; <10% articular surface on X-ray | ~10% | Ignore PM |
| Type 2 | Posterolateral fragment extending into the fibular notch (incisura); <20% on X-ray | ~50% | Ignore PM unless talus remains subluxed after lateral malleolus (LM) + medial malleolus (MM) fixation; possible role for fixation in Weber C |
| Type 3 | Posteromedial two-part fracture involving the medial malleolus; <25% on X-ray; "double contour sign" at MM | ~30% | Fix with buttress plates via posteromedial approach |
| Type 4 | Large posterolateral triangular fragment involving >1/3 of posterior malleolus; >25% on X-ray | ~10% | Fix with AP percutaneous screws (after percutaneous reduction) OR posterior buttress plating |
- Bartonicek excluded fractures involving the anterior colliculus of the medial malleolus (classified as partial pilon fractures, not ankle fractures).
- This is the most clinically utilized system today, with management recommendations directly tied to type.
3. Mason Classification (2017)
| Type | Bartonicek Equivalent | Description |
|---|---|---|
| Type 1 | Bartonicek 1 | Extraincisural small fragment |
| Type 2A | Bartonicek 2 | Posterolateral, into notch - termed "rotational pilon" |
| Type 2B | Bartonicek 3 | Posteromedial two-part - termed "rotational pilon" |
| Type 3 | Bartonicek 4 | Large fragment - termed "true posterior pilon" |
Mason used different terminology, describing larger types as "rotational pilons" (2A, 2B) and "true posterior pilons" (type 3).
Comparative Summary Table (Rockwood & Green's, Table 65-3)
| Bartonicek | Mason | Haraguchi | X-ray % | Key Feature |
|---|---|---|---|---|
| 1 | 1 | 3 | <10% | Extraincisural, notch intact |
| 2 | 2A | 1 | <20% | Posterolateral, into notch |
| 3 | 2B | 2 | <25% | Posteromedial, involves MM |
| 4 | 3 | N/A | >25% | Large triangular fragment |
Key Clinical Points
- The classic 25% threshold (operate if fragment >25% of joint surface on lateral X-ray) is outdated - fracture morphology is now equally or more important.
- Biomechanically, a 25% fragment causes no significant decrease in contact area; even a 50% fragment reduces contact area by only ~30%. Posterior malleolar resection of up to 50% remains stable if medial/lateral structures are fixed.
- The PITFL usually remains attached to the posterior malleolus - fixation of the PM therefore reconstitutes the incisura and stabilizes the syndesmosis (may eliminate need for syndesmotic screw).
- A CT scan is recommended when the fragment exceeds ~20% on plain lateral X-ray, to accurately characterize morphology.
- No systematic review has confirmed benefit from surgery, except when it corrects talar subluxation.
Source: Rockwood and Green's Fractures in Adults, 10th ed. 2025, Chapter 65 - Ankle Fractures
This is a shared conversation. Sign in to Orris to start your own chat.