Table 2 Results of univariate COX analysis
Variables | Univariate COX analysis | ||||
|---|---|---|---|---|---|
HR | LCI | UCI | P value | ||
Age | |||||
< 58 years | 1 | ||||
≥ 58 years | 1.021 | 0.358 | 2.913 | 0.969 | |
Sex | |||||
Male | 1 | ||||
Female | 0.937 | 0.463 | 1.898 | 0.857 | |
BMI | |||||
< 26.8 | 1 | ||||
≥ 26.8 | 2.555 | 0.715 | 9.135 | 0.149 | |
Tumor types | |||||
Borderline tumor | 1 | ||||
Malignant primary tumor | 0.718 | 0.358 | 1.438 | 0.350 | |
Malignant metastatic tumor | 0.000 | 0.000 | Inf | 0.997 | |
Operation related complications | |||||
No | 1 | ||||
Yes | 1.877 | 0.918 | 3.840 | 0.085 | |
Adjuvant chemotherapy/ radiotherapy | |||||
No | 1 | ||||
Yes | 1.058 | 0.545 | 2.057 | 0.867 | |
Pathological fracture | |||||
No | 1 | ||||
Yes | 1.479 | 0.731 | 2.993 | 0.277 | |
Primary/ revision reconstruction | |||||
Primary reconstruction | 1 | ||||
Revision reconstruction | 1.038 | 0.514 | 2.096 | 0.918 | |
Anatomical location | |||||
Distal femur | 1 | ||||
Proximal tibia | 0.412 | 0.180 | 0.945 | 0.036* | |
Site of knee | |||||
Left | 1 | ||||
Right | 0.878 | 0.445 | 1.730 | 0.706 | |
Bleeding volume | |||||
< 1000 ml | 1 | ||||
> =1000 ml | 0.906 | 0.423 | 1.941 | 0.800 | |
Operation time | |||||
< 210 min | 1 | ||||
> =210 min | 0.881 | 0.368 | 2.105 | 0.775 | |
Bone transplantation | |||||
No | 1 | ||||
Yes | 1.506 | 0.622 | 3.645 | 0.364 | |
Custom/ modular prosthesis | |||||
Custom | 1 | ||||
Modular | 2.244 | 0.957 | 5.257 | 0.063 | |
Prosthesis motion mode | |||||
Rotational | 1 | ||||
Fixed | 2.336 | 1.134 | 4.812 | 0.021* | |
Length of prosthetic stem | |||||
< 144 mm | 1 | ||||
> =144 mm | 0.578 | 0.287 | 1.165 | 0.125 | |
Diameter of prosthetic stem | |||||
< 12 mm | 1 | ||||
> =12 mm | 0.618 | 0.289 | 1.323 | 0.215 | |
Material of prosthesis | |||||
Titanium | 1 | ||||
Vatallium | 1.128 | 0.370 | 3.411 | 0.832 | |
Length of resection | |||||
< 10.4 cm | 1 | ||||
> =10.4 cm | 8.959 | 3.767 | 21.310 | < 0.001** | |