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Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 3 Interobserver reliability tested with intraclass correlation coefficient (ICC), Kappa Index, and Cronbach's alpha for the 2D and 3D measurements

From: Transepicondylar distance measured on MRI can predict the length of the graft required for different anterior cruciate ligament reconstruction (ACLR) techniques useful for revision surgery

Interobserver reliability

Intraclass correlation coefficient (ICC)

K index

Cronbach’s alpha

Single measures

CI 95%

Average measures

CI95%

Obs 1 (T1) and Obs 2 (T1)Kappa

SD

CI 95%

Obs 1 (T1) and Obs 2 (T1) Alpha

CI 95%

2D measurements

 Transepicondylar distance (TD)

0.9878

0.9786–0.9931

0.9939

0.9892–0.9965

0.864

0.019

0.827–0.902

0.9939

0.9902

 Medial femoral condyle AP dimension

0.877

0.7929–0.9283

0.9344

0.8845–0.9628

0.677

0.049

0.580–0.774

0.9369

0.8986

 Lateral femoral condyle AP dimension

0.8882

0.8110–0.9300

0.9408

0.8956–0.9664

0.772

0.042

0.490–0.853

0.9427

0.9079

 Proximal tibia ML dimension

0.9788

0.9630–0.9879

0.9893

0.9811–0.9939

0.858

0.02

0.820–0.897

0.9894

0.9829

 Medial tibial plateau AP dimension

0.8533

0.7552–0.9140

0.9208

0.8605–0.9551

0.535

0.062

0.414–0.657

0.9291

0.8861

 Lateral tibial plateau AP dimension

0.8955

0.8228–0.9393

0.9448

0.9028–0.8687

0.647

0.038

0.572–0.723

0.9449

0.9114

 Tibial PCL insertion-trochlearcartilage distance

0.9406

0.8977–0.9659

0.9694

0.9461–0.9826

0.724

0.041

0.0645–0.804

0.9694

0.9509

 Patellar tendon length

0.7314

0.5706–0.8381

0.8448

0.7266–0.9119

0.515

0.067

0.383–0.647

0.8603

0.7754

3D measurements

 Intrarticular length of ACL graft

0.771

0.6379–0.8671

0.8745

0.7789–0.928

0.535

0.066

0.405–0.664

0.8770

0.8022

 Outside-in femoral tunnel length

0.8475

0.7461–0.9105

0.9175

0.8546–0.9532

0.457

0.053

0.354–0.560

0.9175

0.8674

 Outside-in anatomic ACL reconstruction

0.9121

0.8501–0.9491

0.954

0.9190–0.9739

0.585

0.048

0.492–0.678

0.9590

0.9340

 Saragaglia/Yamaguchi techniques

0.8267

0.7136–0.8978

0.9051

0.8329–0.9462

0.619

0.059

0.503–0.735

0.9053

0.8477

 Anatomic anterolateral ligament reconstruction

0.4244

0.1682–0.6270

0.5959

0.2880–0.7707

0.271

0.071

0.131–0.410

0.5967

0.3517

 Lateral extrarticular tenodesis (anatomical femur)

0.6268

0.4242–0.7696

0.7706

0.5957–0.8698

0.342

0.066

0.213–0.470

0.798

0.6753

 Lateral extrarticular tenodesis (non-anatomical femur)

0.8831

0.8028–0.9319

0.9379

0.8906–0.9648

0.638

0.047

0.546–0.730

0.9396

0.9030

 Over the top femoral position ACL reconstruction

0.8517

0.7526–0.9131

0.9199

0.8589–0.9545

0.641

0.047

0.546–0.730

0.9218

0.8743

 Marcacci technique

0.8831

0.8028–0.9319

0.9379

0.8906–0.9648

0.638

0.047

0.546–0.730

0.9396

0.9030

  1. The second measurement (T1) of each observer was used for every test
  2. CI Confidence interval, AP anteroposterior, ML mediolateral, PCL posterior cruciate ligament, ACL anterior cruciate ligament