This study tested how reliably nine surgeons — across three experience tiers — could classify 65 acetabular fractures using the Letournel system. Each surgeon classified the same cases twice, two months apart, first on plain radiographs then with CT added. The goal was to determine whether the 10-type Letournel classification is reproducible, and whether CT meaningfully improves agreement.
The Letournel classification is the universal language of acetabular surgery — every outcome paper from Matta (1996) to Mayo (1994) uses it. This study asked whether surgeons are actually speaking that language the same way.
For experienced, high-volume surgeons, the answer is yes: plain radiographs alone provide sufficient information for reliable typing. When you read AP and Judet views with dedicated training, CT adds detail about the joint (loose bodies, impaction) but does not change how you name the fracture.
For residents and general trauma surgeons, the data are a direct call to action. A κ of 0.51 means general trauma surgeons are essentially flipping a coin on the harder fracture patterns. If you are covering a trauma call and see a complex acetabular fracture, get the Judet views, apply the Letournel criteria systematically, and involve an acetabular specialist before committing to an approach.
The practical rule from Table IV: transverse and posterior wall fractures are reliably classified by everyone (99% and 94% agreement). T-shaped and anterior wall fractures are not. These are the cases where misclassification most often leads to the wrong surgical approach.
This study tested how reliably nine surgeons — across three experience tiers — could classify 65 acetabular fractures using the Letournel system. Each surgeon classified the same cases twice, two months apart, first on plain radiographs then with CT added. The goal was to determine whether the 10-type Letournel classification is reproducible, and whether CT meaningfully improves agreement.
The Letournel classification is the universal language of acetabular surgery — every outcome paper from Matta (1996) to Mayo (1994) uses it. This study asked whether surgeons are actually speaking that language the same way.
For experienced, high-volume surgeons, the answer is yes: plain radiographs alone provide sufficient information for reliable typing. When you read AP and Judet views with dedicated training, CT adds detail about the joint (loose bodies, impaction) but does not change how you name the fracture.
For residents and general trauma surgeons, the data are a direct call to action. A κ of 0.51 means general trauma surgeons are essentially flipping a coin on the harder fracture patterns. If you are covering a trauma call and see a complex acetabular fracture, get the Judet views, apply the Letournel criteria systematically, and involve an acetabular specialist before committing to an approach.
The practical rule from Table IV: transverse and posterior wall fractures are reliably classified by everyone (99% and 94% agreement). T-shaped and anterior wall fractures are not. These are the cases where misclassification most often leads to the wrong surgical approach.