Table 1.

Defects created per donor and surgeon observation on displacement of hydrogel scaffold and hydrogel integrity after completion of continues passive motion (CPM) protocol. +: indicates no displacement of the hydrogel scaffold/no decline in hydrogel integrity. -: indicates displacement of the hydrogel scaffold/decline in hydrogel integrity.

Donor	1.0 ​cm2		1.5 ​cm2		2.0 ​cm2
	Displacement	Integrity	Displacement	Integrity	Displacement	Integrity
1: Medial	+	+	+	-	+	-
1: Lateral	+	+	+	+	+	-
2: Medial	N.A.a	N.A.a	N.A.a	N.A.a	N.A.a	N.A.a
2: Lateral	+	+	+	+	+	+
3: Medial	N.A.a	N.A.a	N.A.a	N.A.a	N.A.a	N.A.a
3: Lateral	+	+	+	+	+	+
4: Medial	+	+	+	+	+	+
4: Lateral	+	+	+	+	+	+
5: Medial	+	+	+	+	N.A.b	N.A.b
5: Lateral	+	+	+	+	N.A.b	N.A.b
6: Medial	+	+	+	+	+	+
6: Lateral	+	+	+	-	+	+
7: Medial	N.A.b	N.A.b	N.A.b	N.A.b	+	+
7: Lateral	N.A.b	N.A.b	N.A.b	N.A.b	+	+
Total	10/10	10/10	10/10	8/10	10/10	8/10

N.A.: Not available.

^aMedial side of second and third donor were not usable due to present osteoarthritis.

^bin the 5th donor, due to staining with Indian ink, defects sized 2.0 ​cm² were not usable, to have an even distribution, a 7th donor leg was used for defects sized 2.0 ​cm².