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SL gap and angle calculation. SL angle from the FE model calculated using two lines in the Y-Z plane (lateral view). Line 1 (L′P–LP): perpendicular to the tangent of the two distal poles of lunate (LTLT′). Line 2 (S′–S′T): tangential to the palmar proximal and distal convexities of scaphoid. The SL angle is the angle between Line 1 (L′P–LP) and Line 2 (S′–S′T)
