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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

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