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Reliability of Current Classification Systems for Periprosthetic Fractures of the Humerus
Richard L Auran1, Tram L Tran1, Niloofar Dehghan1,2
1Department of Orthopaedic Surgery, The University of Arizona College of Medicine-Phoenix, Phoenix, AZ; and.
Journal of Orthopaedic Trauma
|September 26, 2022
Summary
The Wright and Cofield system shows poor reliability for classifying periprosthetic humerus fractures, unlike the Unified Classification System (UCS). A new, more reliable system is needed for consistent clinical discussion.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Periprosthetic humerus fractures are complications of shoulder arthroplasty.
- Existing classification systems, like the Wright and Cofield system, lack validation with large patient cohorts.
- Standardized classification is crucial for effective treatment and communication.
Purpose of the Study:
- To compare the interobserver and intraobserver reliability of the Wright and Cofield system against the Unified Classification System (UCS).
- To evaluate the reliability of stem stability and loosening assessments in periprosthetic humerus fractures.
- To determine the most reliable classification system for periprosthetic proximal humerus fractures using the largest patient sample to date.
Main Methods:
- Retrospective review of 76 patients with periprosthetic humerus fractures (December 2011 - January 2021).
- Three fellowship-trained surgeons assessed radiographs for stem stability, loosening, Wright and Cofield classification, UCS classification, and treatment recommendations at two time points.
- Interobserver and intraobserver reliability were calculated using kappa statistics.
Main Results:
- The Wright and Cofield system demonstrated slight interobserver (kappa=0.04) and moderate intraobserver (kappa=0.44) agreement.
- The Unified Classification System (UCS) showed fair interobserver (kappa=0.29) and moderate intraobserver (kappa=0.51) agreement.
- Stem stability and loosening assessments had moderate to substantial agreement, outperforming fracture classification systems.
Conclusions:
- The Wright and Cofield system is less reliable than the UCS for classifying periprosthetic humerus fractures.
- Current classification systems lack the necessary reliability for standardized clinical use.
- Development of a more reliable and clinically relevant classification system is essential for periprosthetic proximal humerus fractures.
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