Abstract
Aim: Previous publications have described various therapeutic modalities for symptomatic cysts, including non-steroidal anti-inflammatory drugs, cystostomy, physical therapy, and exercises. The objective of thise study was to elucidate the effectiveness of shrinking the cyst without steroidal injection and to compare aspiration with classic physiotherapy and exercises.
 Material and Method: This randomized, controlled trial involved 40 patients with Baker’s cyst. The participants were randomized into two groups, (I) an aspiration group (n=20) and (II) a control group (n=20). In the aspiration group, Baker’s cyst content was aspirated percutaneously under USG guidance, while no aspiration was performed in the control group. Pain was evaluated with a visual analog scale, while the Lysholm knee scoring scale and Cincinnati knee rating system were employed to determine functional status. Quality of life and disability were evaluated using the Nottingham Health Profile and the Western Ontario and McMaster Universities Arthritis Index .
 Results: Differences were observed in USG measurements (width, length, and area) and clinical parameters before and after treatment in both groups. However, although these differences were greater in the aspiration group, they were not statistically significant.
 Conclusion: Our results indicate that cyst aspiration performed with USG provides no additional effect to those of physical exercises and cold application. Exercise therapy and cold application should be considered before proceeding with an invasive procedure.
Highlights
Popliteal cysts (PCs) were first described by Adams in 1840
Our results indicate that cyst aspiration performed with USG provides no additional effect to those of physical exercises and cold application
Exercise therapy and cold application should be considered before proceeding with an invasive procedure
Summary
Popliteal cysts (PCs) were first described by Adams in 1840. After Baker’s report of 1877, these cysts were collectively defined as Baker’s cyst (BC) [1]. There are six bursas around the popliteal fossa in the knee [1], all of which are expandable. The most frequently expanding bursa is the gastrocnemius semimembranosus bursa, known as the PC or BC [2]. Rauschning and Lindgren classified cysts in the popliteal region into two categories [3,4]. In case of primary or idiopathic BCs, the cyst has a valvular connection with the joint space. This type of cyst is frequently seen in children and young adults and does not cause joint symptoms. Secondary or symptomatic cysts are directly related to the joint and are often symptomatic
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