Table 1.

Clinical assessment scores for fusion ratio modified according to Mehlhorn et al. (2020)

Score	Definition
Fusion grades
Failed	Failed fusion was considered when fusion occurred in less than 33%.
Partial	Partial arthrodesis was defined as bone bridging, but not obliteration of the joint Focal partial fusion: associated with poor satisfaction and high risk of failure Segmented partial fusion: associated with moderate satisfaction Range of fusion from 34%−65%
Complete Sub-optimal	Range of fusion from 70–80%, clinically accepted with good satisfaction
Complete optimal	More than 80% osseous bridging across the joint on multiple slices on imaging was required to consider a successful fusion. Which is associated with excellent satisfaction