Table 1: Baseline Characteristics of Subjects Receiving Autologous Chondrocyte Implantation (ACI) to Treat Chondral Lesions of the Knee

Characteristics		N	Percentages (%)
Sex	Males	80	72.1
	Females	31	27.9
Occupation	Unknown	25	22.5
	Student	16	14.4
	Worker/bricklayer	11	9.9
	Other	59	53.2
Cause of the Lesion	Unknown	44	39.6
	Traumatic	34	30.6
	Osteocondritis dissecans (OCD)	25	22.5
	Other	8	7.3
Site	Medial femoral condyle	59	53.6
	Lateral femoral condyle	8	7.2
	Trochlea	9	8.2
	Patella	18	16.4
	Other	17	14.6