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Statistical Validation of the Grand Rapids Arch Collapse Classification.

David Burkard¹, Daniel Patton², Michelle Padley³

¹Michigan State University College of Human Medicine, MI, USA.

Foot & Ankle Orthopaedics

|January 31, 2022

Summary

The Grand Rapids Arch Collapse Classification system demonstrates substantial inter- and intrarater reliability among physicians. This validated system aids in consistently describing arch collapse and related conditions for better clinical understanding.

Keywords:

ankle arthritis flatfoot kappa plantar fasciitis posterior tibial tendon dysfunction

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Area of Science:

Orthopedics
Podiatry
Radiology

Background:

The Grand Rapids Arch Collapse Classification system was introduced in 2011.
It categorizes arch collapse into five types based on affected foot/ankle structures.
The system aims to improve physician and patient comprehension of arch collapse mechanisms.

Purpose of the Study:

To evaluate the inter- and intrarater reliability of the Grand Rapids Arch Collapse Classification system.
To assess the system's consistency among physicians with varying training levels.

Main Methods:

A stratified selection of 50 patients with foot/ankle pain and radiographs was used.
Physicians reviewed radiographs and clinical synopses to classify arch collapse.
The classification's reliability was assessed through repeated testing over eight weeks.

Main Results:

Twenty-six physicians completed the initial survey, showing substantial agreement across all five classification types (Kappa scores ranging from 0.63 to 0.72).
The overall interrater reliability (combined kappa score) was 0.68.
Intrarater reliability was also substantial, with a Kappa score of 0.74 after an eight-week interval.

Conclusions:

The Grand Rapids Arch Collapse Classification system exhibits substantial reliability among physicians.
The system provides a consistent method for describing arch collapse and associated conditions.
Its demonstrated repeatability supports its utility in clinical practice.