Distal Humerus Traction Radiographs: Is the Interobserver and Intraobserver Reliability Comparable With Computed...

Area of Science:

• Orthopedic Surgery
• Radiology
• Trauma Care

Background:

• Accurate classification and characterization of distal humerus fractures are crucial for effective treatment planning.
• Interobserver and intraobserver reliability of imaging modalities can impact diagnostic consistency.

Purpose of the Study:

• To compare the reliability of traction radiographs versus 2D CT in classifying and characterizing distal humerus fractures.
• To assess the influence of surgeon experience on the reliability of each imaging modality.

Main Methods:

• Retrospective review of data from skeletally mature patients with intra-articular distal humerus fractures.
• Eleven orthopaedists evaluated traction radiographs and 2D CT scans for fracture classification (OTA/AO, Jupiter-Mehne) and characteristic identification.
• Interobserver and intraobserver reliability were assessed using Kappa statistics.

Main Results:

• Both traction radiographs and 2D CT demonstrated moderate intraobserver agreement (κ = 0.70-0.75) for OTA/AO and Jupiter-Mehne classifications.
• 2D CT improved interobserver reliability for OTA/AO classification (fair to moderate) and coronal fracture identification (slight to fair) compared to traction radiographs, especially in less-experienced surgeons.
• Traction radiographs showed improved intraobserver reliability for detecting stable articular fragments (fair to substantial) compared to 2D CT.

Conclusions:

• Traction radiographs and 2D CT offer comparable diagnostic characteristics for distal humerus fractures.
• 2D CT may enhance the identification of coronal fracture lines and articular comminution, particularly for surgeons with less experience.