Journal of Orthopaedic Surgery and Research

Table 2 The inter-observer and intra-observer reliability of all measurements

From: Increased lower limb length ratio in patients with patellar instability

Parameter	Inter-observer		Intra-observer
Parameter	ICC	95%CI	ICC	95%CI
aT/F ratio	0.890	0.857–0.922	0.938	0.912–0.963
mT/F ratio	0.937	0.892–0.981	0.897	0.846–0.948
HKA	0.872	0.844–0.899	0.889	0.833–0.944
NSA	0.911	0.871–0.951	0.932	0.891–0.972
VCA	0.908	0.873–0.945	0.835	0.758–0.912
SA	0.947	0.927–0.967	0.971	0.951–0.991
TA	0.935	0.915–0.955	0.904	0.884–0.924
MTI	0.963	0.943–0.983	0.936	0.916–0.956
LTI	0.946	0.926–0.966	0.923	0.903–0.943
PTA	0.911	0.891–0.931	0.958	0.938–0.978
IS	0.930	0.881–0.978	0.878	0.827–0.928
BP	0.946	0.897–0.995	0.912	0.873–0.950
CD	0.903	0.865–0.947	0.869	0.816–0.922
MIS	0.896	0.862–0.934	0.930	0.889–0.970
PTMA	0.863	0.827–0.899	0.927	0.884–0.966

aT/F anatomical tibia length/femur length, mT/F mechanical tibia length/femur length, HKA hip–knee–ankle angle, NSA femoral neck-shaft angle, VCA femoral valgus cut angle, SA sulcus angle, TA trochlear angle, MTI medial trochlear inclination, LTI lateral trochlear inclination, PTA patella tilt angle, IS Insall–Salvati ratio, BP Blackburne–Peel ratio, CD Caton–Deschamps ratio, MIS modified Insall–Salvati ratio, PTMA patellar tendon moment arm

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ISSN: 1749-799X

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