Table 1.

Complications noted including mechanical and biological failure.

A. Mechanical failure
A.1. Type 1A failure- instability after limb salvage surgery
Procedure	No. of Patients
a. Proximal femur endoprosthesis	2
b. Proximal humerus endoprosthesis/nail cement spacer	0
c. Pelvis reconstruction	0
d. Proximal tibia endoprosthesis	0
e. Others	0
Total	2/116 (1.72%)
A.2. Type 1A failure- extension lag after proximal tibia endoprosthesis
a. No. of patients/total (%) without any lag (or with full active extension)	31/39 (79.5%)
b. No. of patients/total (%) with lag	8/39 (20.51%)
c. Mean extension lag (range)	2.31° (0–20°)
d. Mean flexion (range)	94.1° (70–110°)
B. Biological failure
B.1. Type 1B-failure of coverage after limb salvage surgery
Procedure	No. of Patients
a. Proximal femur endoprosthesis	3
b. Proximal tibia endoprosthesis	8
c. Proximal humerus endoprosthesis/nail cement spacer	0
d. Pelvis reconstruction	1
e. Others	0
Total	12/116 (10.3%)
B.2. Type 4 failure- deep infection after limb salvage surgery
Procedure	No. of Patients
a. Proximal femur endoprosthesis	1
b. Proximal tibia endoprosthesis	0
c. Proximal humerus endoprosthesis/nail cement spacer	0
d. Pelvis reconstruction	2
e. Others	1
Total	4/116 (3.45%)