What is subarticular disc protrusion/osteophyte @c4c5 mildly narrowing foramina?

Different things: Between each vertebrae (backbone) from the skull to the pelvis is a material known as a "disc" that serves as a sort of shock absorber. This material can sometimes bulge into the spinal canal (protrusion). An osteophyte is bone growth from the vertebra that can also push on the cord or nerve roots. Foramina are the exit points for nerve roots. These exit points are a bit narrowed in your neck.

Arthritis: This is a radiological description of degenerative arthritis. Many people begin having evidence of arthritis in their discs at an early age (30s). The disc has weakened a bit and the disc is bulging and a bone spur has started to form. This is typically near the facet joint (subarticular). It doesn't necessarily cause pain, however some can have pain related to, this.

C4-5 stenosis: It means a portion of disc has broken off & is now pushing & occupying the channel where the C5 nerve is coming out. It could result i. Chest pain.