High-resolution peripheral quantitative CT of the proximal fifth metatarsal reveals microstructural similarity between Lawrence and Botte zones I and II

Listen to Simon and Amy discuss the paper 'High-resolution peripheral quantitative CT of the proximal fifth metatarsal reveals microstructural similarity between Lawrence and Botte zones I and II' published in the January 2026 issue of Bone & Joint Research.

Click here to read the paper.

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Transcript

[00:00:00] Welcome back to another episode of AI Talks with Bone & Joint from the publishers of Bone & Joint Research. Today we're discussing the paper 'High-resolution peripheral quantitative CT of the proximal fifth metatarsal reveals microstructural similarity between Lawrence and Botte zones I and II', published in January 2026 by L Krüger and colleagues. I am Simon and I'm joined by my co-host, Amy.

Hello Simon. I'm looking forward to discussing this topic. Metatarsal fractures are quite common, and knowing the best way to treat them is vital. So what sparked this research?

The main motivation was the ongoing debate about the treatment of proximal fifth metatarsal fractures. These are classified by the Lawrence and Botte system into three zones each suggesting different treatments. However, there's been some conflicting evidence, especially concerning zone II. Should these fractures be managed conservatively, like zone I fractures or surgically like zone III fractures?

It appears that accurately classifying these fractures could greatly influence treatment [00:01:00] outcomes. How did the researchers tackle this issue?

They examined the microarchitecture of the proximal fifth metatarsal fracture using high-resolution peripheral quantitative CT or HR-pQCT to discern structural differences across the three zones. They acquired 30 bilateral fifth metatarsal fracture bones from 15 body donors and focused on trabecular and cortical bone parameters to determine if zones I and II were structurally similar.

 HR-pQCT indeed sounds like a powerful tool. What were the findings when they compared the different zones?

They discovered that both trabecular and cortical parameters showed more structural similarity between zones I and II than between zones II and III. Specifically parameters like trabecular bone mineral density and cortical thickness were similar between zones I and II.

This indicates that zone II fractures may have a healing potential more akin to zone I fractures than to zone III fractures. That's quite a significant finding, and it really challenges the current norms for treating zone II fractures. Were there any demographic factors that had an impact on the bone microarchitecture?[00:02:00] 

Yes. The study found that female sex and advanced age were strong risk factors for poorer bone microarchitecture across all three zones. Interestingly, a high BMI negatively affected the trabecular structure in zone I. Thus older women and individuals with a higher BMI may be more susceptible to these fractures.

That's an important note for clinicians. Older women, and those with a higher BMI might need closer monitoring and more personalized treatment plans.

What about the study's methods and any limitations? Good question. The study used freshly prepared and subsequently frozen fifth metatarsal fracture bones to maintain their condition for scanning.

One limitation noted by the authors was the advanced age of the body donors. Which might not fully represent younger patients who typically suffer high trauma or stress fractures. Also, the nature of body donation might have led to some selection bias. It appears there's still room for further research, perhaps including younger individuals.

So to wrap things up, what are the main takeaways from this study?

The main takeaways are [00:03:00] firstly, the microstructural similarity between zones I and II, supports conservative treatment for zone II fractures, challenging the current practice of often recommending surgery. Secondly, demographic factors like female sex and advanced age are linked to poorer bone microstructure, which could inform more tailored treatments. Lastly, further research involving a more diverse age group is necessary to validate and broaden these findings.

Well put Simon. This research indeed adds an important piece to the puzzle of managing fifth metatarsal fractures. Thank you all for tuning into AI Talks with Bone & Joint. Join us next time for more insights from the world of orthopaedic research.

Goodbye everyone.