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Table 8 Previously published X-ray Reliability Studies for the Traditional Tönnis Classification System

From: Binary Tönnis classification: simplified modification demonstrates better inter- and intra-observer reliability as well as agreement in surgical management of hip pathology

Study Observers Radiographs Intraobserver Interobserver
Troelsen et al. 4 25 Grade 0–1 vs 2–3: 0.54
Grade 0–3: 0.66
 
Cloohisy et al. 6 77 K = 0.60 (95% CI: 0.54–0.66) K = 0.59
Steppacher et al. 2 75 K = 0.73 and 0.76 K = 0.74
Valera et al. 2 117 K = 0.364–0.397 K = 0.173–0.397
Hiza et al 3 49 K = 0.472 K = 0.287
Current Study 5 40 Traditional Tönnis K = 0.474
Binary Tönnis K = 0.866
Traditional Tönnis K = 0.858
Binary Tönnis K = 0.928