Gait analysis: Comparative evaluation of conventional total knee replacement and modular distal femoral megaprosthesis

•Limb salvage surgery with mega-prosthetic implants is common for bone tumors.•Gait alterations between megaprostheses and standard implants were never compared.•Conventional and mega-prosthetic implants lead to partially similar gait alteration.•The implant of a megaprosthesis is not a demolitive surgery with poor clinical results.