Longitudinal assessment of cyst-like lesions of the knee and their relation to radiographic osteoarthritis and MRI-detected effusion and synovitis in patients with knee pain

Table 1 Distribution of prevalent cysts and bursitides according to baseline Kellgren-Lawrence grades of radiographic osteoarthritis

Type of lesion^a	Kellgren-Lawrence grade
	All (N= 319)	0 (N= 103)	1 (N= 27)	2 (N= 37)	3 (N= 136)	4 (N= 16)
Any type*	208 (65)	56 (54)	19 (70)	29 (78)	90 (66)	14 (88)
Popliteal cyst	128 (40)	31 (30)	16 (59)	15 (41)	56 (41)	10 (63)
Subgastrocnemius bursitis	49 (15)	8 (8)	5 (19)	10 (27)	23 (17)	3 (19)
proximal tibiofemoral joint cyst	26 (8)	10 (10)	1 (4)	5 (14)	9 (7)	1 (6)
Hoffa's fat pad ganglion cyst	25 (8)	6 (6)	2 (7)	7 (19)	9 (7)	1 (6)
SM-MCL bursitis	13 (4)	1 (1)	0 (0)	1 (3)	7 (5)	4 (25)
PCL ganglion cyst	11 (3)	2 (2)	0 (0)	4 (11)	4 (3)	1 (6)
ACL ganglion cyst	9 (3)	3 (3)	0 (4)	2 (5)	4 (3)	0 (0)
Medial meniscal cyst	8 (3)	3 (3)	1 (4)	0 (0)	4 (3)	0 (0)
MCL bursitis	8 (3)	1 (1)	0 (0)	0 (0)	5 (4)	2 (13)
Prepatellar bursitis	6 (2)	0 (0)	0 (0)	0 (0)	5 (4)	1 (6)
Anserine bursitis	4 (1)	0 (0)	1 (4)	1 (3)	2 (2)	0 (0)
Iliotibial bursitis	3 (1)	0 (0)	1 (4)	0 (0)	0 (0)	2 (13)
Superficial infrapatellar bursitis	3 (1)	1 (1)	0 (0)	0 (0)	2 (2)	0 (0)
Deep infrapatellar bursitis	2 (1)	0 (0)	0 (0)	0 (0)	1 (1)	1 (6)
Lateral meniscal cyst	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)

Data presented as number of lesions, either grand total or subtotal for each type of cystic lesions (percentage of knees that had a cystic lesion out of total 319 knees surveyed). N, number of knees that belong to each Kellgren-Lawrence grade; SM-MCL, semi-membranosus medial collateral ligament; PCL, posterior cruciate ligament; ACL, anterior cruciate ligament; MCL, medial collateral ligament. ^aIn order of descending frequency at baseline. *Statistically significant increasing prevalence with increasing Kellgren-Lawrence grade (P = 0.014, by logistic regression controlling for clustering by person).

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