Table 1.

Details of eight patients with joint-preserving tumor resection and reconstruction under the guidance of computer navigation

Patient	Age (years)	Sex	Diagnosis	Location	Surgery	Bone reconstruction	AB (mm)	ROM (°)	MSTS score (points)	Followup (months)	Outcome
1	46	Female	Parosteal osteosarcoma	Proximal tibia (posterior aspect)	Joint-preserving resection (hemicortical)	Vascularized fibular graft	10	0–130	28	59.8
2	14	Male	Conventional osteosarcoma	Femur (subtrochanteric region to distal metaphysis)	Joint-preserving resection after neoadjuvant chemotherapy	Custom tumor prosthesis	14	0–120	30	52.3
3	6	Male	Conventional osteosarcoma	Distal femur (metaphysis)	Joint-preserving resection after neoadjuvant chemotherapy	Custom extendable tumor prosthesis	10	0–90		5.0	Died of pulmonary metastases at 5 months postsurgery
4	8	Male	Conventional osteosarcoma	Distal femur (metaphysis)	Joint-preserving resection after neoadjuvant chemotherapy	Custom extendable tumor prosthesis	8	0–130	30	45.7
5	21	Female	Low-grade chondrosarcoma	Proximal femur (at greater trochanter)	Joint-preserving resection (multiplanar)	Custom tumor prosthesis	50	0–135	28	41.0
6	24	Male	Parosteal osteosarcoma	Distal femur (metaphysis)	Joint-preserving resection (multiplanar)	Custom tumor prosthesis	11	0–95	28	35.3	Proximal femur stem loosened at 2.5 years; only proximal component revised
7	6	Male	Conventional osteosarcoma	Distal femur (metaphysis)	Joint-preserving resection after neoadjuvant chemotherapy	Custom extendable tumor prosthesis	5	0–130	30	26.0
8	16	Female	Low-grade chondrosarcoma	Proximal humerus (metaphysis)	Joint-preserving resection (hemicortical)	Iliac crest bone graft	25	0–180	30	24.7

AB = shortest length of the remaining epiphysis measured to the joint line; MSTS score = Musculoskeletal Tumor Society score, with a total score of 30 points.