Clinical outcomes of cemented distal femur replacements with all-polyethylene tibial components for oncologic indications

Table 2 Operative variables of the study cohort, including procedure type (primary vs revision), surgical indications, mode of failure according to the Henderson Classification, and number of previous knee surgeries on the operative knee, n (%)

Operative variable	Value
Procedure type
Primary	29 (52.7)
Revision	26 (47.3)
Surgical indications
Osteogenic sarcoma	22 (40.0)
Giant cell tumor	9 (16.4)
Metastatic carcinoma	8 (14.6)
Soft-tissue sarcomaa	4 (7.3)
Chondrosarcoma
High-grade	3 (5.5)
Low-grade	2 (3.6)
Synovial chondromatosis	2 (3.6)
Multiple myeloma	2 (3.6)
Non-Hodgkin's lymphoma	1 (1.8)
Pigmented villonodular synovitis	1 (1.8)
Neoplasm of unspecified behavior	1 (1.8)
Primary mode of failure, henderson classification
Type 1 (soft-tissue failure)	6 (10.9)
Type 2 (aseptic loosening)	5 (9.1)
Type 3 (structural failure)b	2 (3.6)
Type 4 (periprosthetic infection)	6 (10.9)
Type 5 (tumor progression)	1 (1.8)
Number of previous surgeries (mean ± SD)	1.1 ± 1.3 surgeries

^aSoft-tissue sarcomas included malignant fibrous histiocytoma, pleomorphic fibrosarcoma, and myxofibrosarcoma.

^bBoth cases of henderson type 3 failure were due to trunnionosis; there were no periprosthetic fractures observed in this cohort.