MILD LUMBAR SPONDYLITIS

My wife had been suffering from back pain and pain in the right thigh. We got an X-Ray done today and following is the report from the same

Lumbar curvature is increased suggestive of unstable lumbosacral spinal axis
Small osteophytes formation is noted at L4 and L5 vertebrae
Partial sacralisaation of L5 Vertebra is noted on left side
Rest of lumbo-sacral vertebrae underview appears grossly normal in structure and outline
L5/S1 disc space is reduced because of sacralisation of L5 vertebra
Rest of disc space underview appear grossly normal
Paraspinal soft tissues appear normal. Both sacro-iliac joints appear normal

Features suggest possibility of  MILD LUMBAR SPONDYLITIS WITH REDUCED L5/S1 DISC SPACE BECAUSE OF SACRALISATAION OF L5 VERTEBRA

Does she need to undergo any kind of surgery?
Are ostephytes cancerous or not? How can this be found out?