2.3.1. Primary outcomes
This protocol is extracted from research article:
Bone graft versus non-bone graft for treatment of calcaneal fractures
Medicine (Baltimore), Jan 15, 2021; DOI: 10.1097/MD.0000000000024261

Böhler angle: The Böhler angle is an imaging index that serves as an anatomical landmark for the posterior articular surface of the subtalar joint. The Böhler angle can reflect the heel height and foot arch angle. A Böhler angle of <0 indicates that the outcome will be less successful regardless of whether surgery is performed. However, a Böhler angle of >15 suggests that long-term effects will be more successful. The size of the Böhler angle is a good indicator of the severity of the trauma load on the subtalar joint.[11] Most manuscripts included in our study did not extensively detail the Böhler angle measurement methods used. However, the same methods and standards were used for each subject in different manuscripts, which brings quality internal consistency. We used the standardized mean difference (SMD) to merge data and to eliminate the interference of the measurement method on the mean outcome.

Gissane angle: The Gissane angle is a radiographic parameter formed by the posterior facet and the line from the calcaneal sulcus to the tip of the anterior process of the calcaneus. Gissane angle typically ranges from 120° to 145°.[12]

Calcaneal height: The Calcaneal height is a radiographic parameter measured on the lateral radiographic view from the most posterior point of the tuberosity to the calcaneocuboid joint.[13]

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