The Bony Resection Accuracy with Patient-Specific Instruments during Total Knee Arthroplasty: A Retrospective Case Series Study
Table 2
Differences between actual bone cuts and surgical plan at each locationa.
Anatomical location
Median, Q1-Q3 (mm)
≤1.0mm, (%)
1.1-2.0 mm, (%)
2.1-3.0mm (%)
Outliers,b (%)
Undercut (%)
Overcut, (%)
DMFC
1.0 (0.4-1.5)
20 (48.8%)
14 (34.1%)
7 (17.1%)
0
17 (41.5%)
24 (58.5%)
DLFC
0.8 (0.4-1.0)
28 (68.3%)
8 (19.5%)
4 (9.8%)
1 (2.4%)
23 (56.1%)
18 (43.9%)
PMFC
1.0 (0.5-1.9)
21 (52.5%)
11 (27.5%)
2 (5.0%)
6 (15.0%)
19 (47.5%)
21 (52.5%)
PLFC
1.0 (0.6-1.7)
21 (51.2%)
12 (29.3%)
3 (7.3%)
5 (12.2%)
21 (51.2%)
20 (48.8%)
AFC
1.6 (0.5-2.6)
13 (34.2%)
9 (23.7%)
10 (26.3%)
6 (15.8%)
19 (50.0%)
19 (50.0%)
MTP
0.8 (0.3-1.6)
22 (56.4%)
12 (30.8%)
5 (12.8%)
0
21 (53.8%)
18 (46.2%)
LTP
1.4 (0.6-1.9)
18 (46.2%)
12 (30.8%)
8 (20.5%)
1 (2.6%)
26 (66.7%)
13 (33.3%)
aAll the numbers in the table were calculated by absolute value except the undercut and overcut columns. bThe outliers were defined as >3mm. Abbreviations: DMFC=distal medial femoral condyle; DLFC=distal lateral femoral condyle; PMFC=posterior medial femoral condyle; PLFC=posterior lateral femoral condyle; AFC=anterior femoral condyle; MTP=medial tibial plateau; LTP=lateral tibial plateau.
