Scratch Collapse Test | Cubital Tunnel Syndrome Assessment

Scretch collapse test in Lacertus syndrom The sensory-collapse test (formerly the scratch-collapse test) is a physical examination finding describing a momentary inhibition of external shoulder… | Natalia Reke

Essentially this test is attempting to determine the “critical crack length” necessary for self sustaining propagation. Essentially, how much deformation of the slab and resulting weak layer failure is needed for propagation. I find this is the best way to understand the mechanics of avalanche initiation. The weight of the rider causes the slab to deform or bend, and under that deformation is a crack that occurs in the weak layer. If the crack is long enough relative to the tensile strength of t