MR Imaging of Intra- and Periarticular Cyst-Like Lesions of the Knee Joint in Workers with Occupational Kneeling

Table 3

Association between knee joint effusion and cyst-like lesions*, meniscal tears, and radiographic tibiofemoral (TF), and patellofemoral (PF) osteoarthritis (OA).

Type of lesion	Floor layers and graphic designers (𝑛=141)
	N	Joint effusion, n (%)	OR^†	95% CI^‡
Popliteus tendon recesses	75	24 (32.0)	0.85	0.53–1.38
Subgastrocnemius bursae	81	31 (38.3)	1.43	0.93–2.22
Semimembranosus- gastrocnemius bursa	60	22 (36.7)	1.25	0.73–2.12
Extracapsular synovial cysts^§	9	3 (33.3)	1.20	0.44–3.28
Medial meniscal tears^¶	88	32 (36.4)	1.36	0.88–2.10
Lateral meniscal tears^¶	23	12 (52.2)	2.52	1.06–5.96
TF OA^‖	25	14 (56.0)	2.90	1.12–7.54
PF OA^‖	16	9 (56.3)	2.96	0.94–9.33

*Cystic lesions potentially communicating with the knee joint capsule.
^†Odds ratio calculated relative to joint effusion (𝑛=48) in the entire study sample. Adjusted for occupation, age, body mass index, knee injuries, and knee-straining sports.
^‡Confidence interval.
^§From capsular defects of the dorsal femoral condyles.
^¶Grade 3 [8].
^‖𝐉oint space narrowing ≥25%. Missing radiographs in 2 floor layers and 1 graphic designer [22].