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Table 3 Measurements and analyses of the relationship between the cohorts

From: The trochlear isometric point is different in patients with recurrent patellar instability compared to controls: a radiographical study

Cohort Control (n = 20) PFI all (n = 40) PFI boss height < 5 mm (n = 25) PFI boss height ≥ 5 mm (n = 15) Control with PFI t test (p) Control with boss height < 5 mm t test (p) Control with boss height ≥ 5 mm t test (p) Boss height < 5 mm with boss height ≥ 5 mm t test (p)
Circle radius 25.5 ± 3.0 29.0 ± 4.5 28.5 ± 4.0 30.0 ± 3.5 < 0.01 < 0.01 < 0.001 ns
AC distance (mm) 9.0 ± 3.0 9.0 ± 3.5 7.5 ± 3.5 10.0 ± 2.5 ns ns ns 0.04
Vertical offset (mm) 7.0 ± 3.5 8.5 ± 4.0 6.5 ± 4.5 9.5 ± 2.0 ns ns 0.03 0.02
Horizontal offset (mm) 5.0 ± 2.5 1.0 ± 2.5 0.5 ± 2.5 0.5 ± 2.0 < 0.0001 < 0.0001 < 0.0001 ns
Boss height (mm) 0.0 ± 2.0 5.0 ± 3.5 3.5 ± 1.5 7.5 ± 1.0 < 0.0001 < 0.0001 < 0.0001 < 0.0001
AD distance 34.0 ± 5.0 30.0 ± 4.5 29.5 ± 3.0 32.5 ± 3.0 < 0.01 < 0.001 ns < 0.01
AB distance 32.0 ± 4.0 37.0 ± 5.0 35.0 ± 4.0 39.0 ± 3.0 0.0001 0.01 < 0.001 < 0.01
AB distance minus AD distance − 2.0 ± 0.5 + 6.0 ± 0.5 + 5.5 ± 0.5 + 7.0 ± 0.5 < 0.0001 < 0.0001 < 0.0001 < 0.0001
  1. Bold values indicate significant results