Table 1: Main clinical and imaging features of each osteoarthritis phenotype.

Phenotype	MRI	CT	USG	Signs and symptoms
Adaptive	Flattening	Flattening Focal sclerosis	X	X
Cartilage erosive	Surface irregularity	X	X	Pain during function
Hypertrophic	Osteophyte	Osteophyte	Osteophyte	Crepitus
Bone	Bone marrow lesion	Subchondral cyst	X	Orthopedic instability
Inflammatory	Effusion	X	Capsule enlargement	Pain on mouth opening

MRI = magnetic resonance imaging; CT = computed tomography; USG = ultrasonography.