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Table 1 Categorization of failure modes according to Henderson [17]

From: Distal femoral replacement with the MML system: a single center experience with an average follow-up of 86 months

Category Type Subgroup
Mechanical I. Soft tissue failure A: instability due to tendon/muscle rupture B: aseptic wound dehiscence
II. Aseptic loosening A: <2 years after implantation B:>2 years after implantation
III. Structural failure A: prosthetic failure B: periprosthetic fracture
Non-mechanical IV. Periprosthetic infection A: <2 years after implantation B:>2 years after implantation
  V. Tumor progression with contamination of prosthesis A: soft tissue tumor B: bone tumor