Table 1.

Indications and Contradictions for Arthroscopic Delivery of the MACI Implant

	Indications	Contraindications
Patient characteristics	Age 18-55 y Normal to low BMI	Age <18 and >55 y High BMI
Lesion characteristics	Focal, contained Entire lesion visualized in static knee through static arthroscope On the femoral condyle (medial or lateral), tibial plateau	Uncontained Very large Untreated/uncorrected bony lesions Kissing Inaccessible via arthroscope On the patella, trochlea
Other joint pathologies	Normal or corrected alignment Normal or corrected ligamentous stability Healthy meniscus desirable but not required	Malalignment Laxity Subchondral sclerosis Advanced degenerative changes

Note: BMI = body mass index.