The semimembranosus-gastrocnemius bursa (Baker cyst) communicates with the knee joint through a posterior capsular opening in 42-54% of normal adults and nearly universally in patients with chronic knee effusion. The communication is valve-like — fluid passes from the joint to the bursa but not back. This explains why Baker cysts recur after aspiration unless the underlying joint pathology (meniscal tear, OA, inflammatory arthritis) is addressed.
Joint fluid decompression when intra-articular pressure is elevated — the valve-like communication allows one-way flow from joint to bursa
Baker cyst treatment should target the underlying intra-articular pathology: meniscal repair or partial meniscectomy for meniscal tears, corticosteroid injection for OA and inflammatory arthritis. Direct cyst aspiration has a 50-90% recurrence rate. Cyst excision (open or arthroscopic) combined with posterior capsular closure is reserved for symptomatic cysts failing joint-directed treatment.
Baker cyst recurrence after aspiration from persistent intra-articular pathology — definitive treatment addresses the underlying joint condition.
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