Background
Methods
Overview
Research coordinator training
Sub-study design
Statistical analysis
Kappa | Strength of agreement |
---|---|
< 0 | Poor |
0 – 0.2 | Slight |
0.2 – 0.4 | Fair |
0.4 – 0.6 | Moderate |
0.6 – 0.8 | Substantial |
0.8 – 1 | Almost perfect |
Results
Categories | Sample patients | Other patients | |
---|---|---|---|
(n = 75) | (n = 363) | ||
Age | Mean | 72.2 | 73.0 |
SD | 12.6 | 13.3 | |
Age at primary TKR | Mean | 62.4 | 62.9 |
SD | 12.9 | 12.7 | |
Gender | Female | 52 (69%) | 255 (70%) |
Race (%) | Asian | 1 (1%) | 1 (0%) |
Black | 10 (13%) | 46 (13%) | |
Hispanic | 3 (4%) | 10 (3%) | |
White | 57 (76%) | 293 (81%) | |
Marital Status (%) | Divorced | 8 (11%) | 31 (9%) |
Married | 40 (53%) | 192 (53%) | |
Single | 13 (17%) | 54 (15%) | |
Widowed | 10 (13%) | 72 (20%) | |
Revision? (%) | Yes | 36 (48%) | 111 (31%) |
Surgeon (%) | Surgeon 1 | 18 (24%) | 69 (19%) |
Surgeon 2 | 14 (19%) | 50 (14%) | |
Surgeon 3 | 9 (12%) | 45 (12%) | |
Surgeon 4 | 7 (9%) | 47 (13%) | |
Surgeon 5 | 7 (9%) | 26 (7%) | |
Other (15) | 20 (27%) | 126 (35%) |
Categories/choices | Surgeon | RC1 (1st) | RC1 (2nd) | RC2 |
---|---|---|---|---|
Index knee
| ||||
Left | 34 | 34 | 35 | 33 |
Right | 40 | 40 | 39 | 40 |
Bilateral operation
| ||||
Yes | 10 | 10 | 10 | 10 |
No | 64 | 64 | 64 | 61 |
Arthroplasty approach type
| ||||
Medial/median peripatellar | 70 | 71 | 71 | 73 |
Lateral peripatellar | 0 | 0 | 0 | 0 |
Subvastus/midvastus | 3 | 1 | 1 | 1 |
Quadriceplasty | 0 | 0 | 0 | 0 |
Tibial Tubercle Osteotomy/TTO | 0 | 0 | 0 | 0 |
Other | 0 | 1 | 2 | 0 |
Not documented | 0 | 1 | 0 | 0 |
Cement fixation
| ||||
Cemented | 72 | 74 | 74 | 68 |
Cementless | 1 | 0 | 0 | 0 |
Not documented | ||||
Lateral release type
| ||||
No | 56 | 56 | 56 | 56 |
Yes – patellar tracking | 9 | 10 | 10 | 9 |
Yes – tibial femoral alignment | 4 | 5 | 5 | 4 |
Yes – both patellar tracking and tibial femoral alignment | 3 | 3 | 3 | 2 |
Not documented/insufficient information | 1 | 0 | 0 | 2 |
Posterior cruciate ligament recession
| ||||
No | 51 | 55 | 55 | 53 |
Yes | 21 | 19 | 19 | 18 |
Not documented | 1 | 0 | 0 | 2 |
Knee alignment
| ||||
Varus | 49 | 43 | 43 | 34 |
Valgus | 19 | 18 | 18 | 13 |
Neutral | 3 | 7 | 7 | 3 |
Not documented/insufficient information | 3 | 6 | 6 | 21 |
Knee predominant compartment
| ||||
Medial | 49 | 46 | 46 | 44 |
Lateral | 19 | 18 | 18 | 12 |
Even | 3 | 2 | 2 | 4 |
Not documented/insufficient information | 3 | 8 | 8 | 11 |
Data elements | Kappa | 95% CI | % Agreement | |
---|---|---|---|---|
RC1 | Index knee | 1.00 | (1.00, 1.00) | 100 |
Bilateral operation | 1.00 | (1.00, 1.00) | 100 | |
Arthroplasty approach type | 0.59 | (0.19, 0.99) | 97.3 | |
Cement fixation | 0 | (0.00, 0.00) | 98.6 | |
Lateral release type | 0.93 | (0.83, 1.00) | 97.3 | |
Posterior cruciate ligament recession | 0.86 | (0.74, 0.99) | 94.5 | |
Knee alignment | 0.80 | (0.68, 0.92) | 89.2 | |
Knee predominant compartment | 0.66 | (0.51, 0.81) | 82.4 | |
RC2 | Index knee | 1.00 | (1.00, 1.00) | 100 |
Bilateral operation | 1.00 | (1.00, 1.00) | 100 | |
Arthroplasty approach type | 0.49 | (0.00, 1.00) | 97.3 | |
Cement fixation | 0 | (0.00, 0.00) | 98.5 | |
Lateral release type | 0.68 | (0.50, 0.85) | 86.3 | |
Posterior cruciate ligament recession | 0.74 | (0.57, 0.90) | 88.9 | |
Knee alignment | 0.53 | (0.39, 0.66) | 70.4 | |
Knee predominant compartment | 0.53 | (0.37, 0.69) | 74.6 |
Data elements | Kappa | 95% CI | % Agreement |
---|---|---|---|
Index knee | 1.00 | (1.00, 1.00) | 100 |
Bilateral operation | 1.00 | (1.00, 1.00) | 100 |
Arthroplasty approach type | 0.49 | (0.00, 1.00) | 97.3 |
Cement fixation | - | - | 100 |
Lateral release type | 0.66 | (0.49, 0.83) | 86.3 |
Posterior cruciate ligament recession | 0.79 | (0.64, 0.95) | 91.8 |
Knee alignment | 0.66 | (0.52, 0.79) | 77.5 |
Knee predominant compartment | 0.65 | (0.49, 0.80) | 80.3 |
Data elements | Kappa | 95% CI | % Agreement |
---|---|---|---|
Index knee | 0.97 | (0.92, 1.00) | 98.6 |
Bilateral operation | 1.00 | (1.00, 1.00) | 100 |
Arthroplasty approach type | 0.66 | (0.21, 1.00) | 97.3 |
Cement fixation | - | - | 100 |
Lateral release type | 1.00 | (1.00, 1.00) | 100 |
Posterior cruciate ligament recession | 1.00 | (1.00, 1.00) | 100 |
Knee alignment | 1.00 | (1.00, 1.00) | 100 |
Knee predominant compartment | 1.00 | (1.00, 1.00) | 100 |