Ultrasonographic Assessment of the Normal Femoral Articular Cartilage of the Knee Joint: Comparison with 3D MRI

Table 1

Mean cartilage thicknesses measured on MR and US images at the patellofemoral joint suprapatellarly (center of the sulcus and the medial and lateral edge of the sulcus) and at the tibiofemoral joint infrapatellarly (medial and lateral femoral condyles).

Patellofemoral joint (suprapatellar view)
Tibial surface
		Lateral		Sulcus		Medial
		Mean	Range	Mean	Range	Mean	Range
	MRI (mm)	2.44	1.87–3.43	3.61	2.41–5.00	2.35	1.57–4.05
	US (mm)	2.08	1.40–2.68	3.17	1.82–4.30	2.04	1.28–3.33
MRI/US difference %		17.8%		14.0%		15.5%
Tibiofemoral joint (infrapatellar view)
Femoral condylar cartilage
		Lateral		Medial
		Mean	Range	Mean	Range
	MRI (mm)	2.73	1.72–4.40	2.35	1.73–3.99
	US (mm)	2.17	1.50–2.82	1.95	1.31–2.84
MRI/US difference %		25.6%		21.0%