Table 1.

Studies assessing diagnosis of glenohumeral osteoarthritis using the Walch classification

Study	Year published	Number of reviewing surgeons	Patients with primary gleno-humeral osteo-arthritis (number)	Method of comparison	Classification	Intraobserver reproducibility (κ)	Interobserver reliability (κ)
Bercik et al. [1]	2016	3	129	3-D reconstruction of CT scan	Original Walch (A1, A2, B1, B2, C)	0.604 Moderate	0.391 Fair
					Modified	0.882 Excellent	0.703 Substantial
Kidder et al. [15]	2012	3	116	CT scan	Original Walch	0.866 Excellent	0.6 Moderate
					Regroup Walch (A, B, C)	0.915 Excellent	0.548 Moderate
					New classification (N, B2, C)	0.874 Excellent	0.545 Moderate
Lowe et al. [18]	2016	3	30	CT and MRI	Original Walch	CT 0.47–0.60 Moderate MRI 0.61–0.73 Good	CT 0.26–0.34 Fair MRI 0.23–0.26 Fair
Nowak et al. [23]	2010	8	26	CT scan	Original Walch	0.611 Substantial	0.508 Moderate
Scalise et al. [25]	2008	4	24	CT scan	Original Walch	0.34 Fair	0.37 Fair
					Regroup		0.44 Moderate
Walch et al. [29]	1999	2	24	CT scan	Regroup	0.65–0.7 Substantial	0.65–0.7 Substantial

3-D = three-dimensional; N = normal glenoid.