Evolution of the Walch Classification and Its Importance on the B2 Glenoid

A thorough assessment and understanding of glenoid morphology is critical prior to shoulder arthroplasty for primary glenohumeral osteoarthritis. This is due to the fact that multiple studies have demonstrated the importance of reestablishing the native glenoid anatomy on the long-term survivability of the polyethylene glenoid component. In 1999, Walch et al. created a classification system for primary glenohumeral osteoarthritis based upon glenoid erosion and retroversion, and humeral head posterior subluxation. Since its original publication, the Walch classification has been the most widely used classification system for primary glenohumeral arthritis. However, after its initial publication in 1999, additional modifications have been made to the classification to clarify various definitions as well as further characterize other glenoid morphopathology seen in primary glenohumeral osteoarthritis. This article will discuss the original and modified Walch classification, the key differences between the two and the importance of these differences on the classification of the “B2 glenoid.”