Cysts Around the Knee

Pre-patella Bursitis (Housemaids’ knee)

  • More common in carpet layers & miners due to irritation of the pre-patella bursa

Treatment

  • Nonoperative
    • bandaging
    • avoidance of kneeling
  • Operative
    • excision of the lump in chronic cases

Infra patella Bursitis (Clergyman’s knee)

  • Similar pathology but the swelling is over the patella tendon / tuberosity not the patella itself

Semimembranosus Bursa

  • Bursa between the tendon of semimembranosus & the medial head of gastrocnemius
  • Usually painless lump behind the knee
  • may be confused with a popliteal cyst or aneurism & communicates with the joint (one way flow)
  • Need to check for joint pathology

Popliteal cyst (Bakers when in association with Osteoarthritis)

  • Rupture or herniation of the synovium & is secondary to ↑ production of synovial fluid due to some intra-articular pathology
  • Treat the joint not the cyst

Meniscal cyst

  • Probably traumatic in origin, synovial cells get displaced into the vascular region between the meniscus & capsule where they multiply
  • Months or years later
    • lump or complains of ache
  • The lump may appear to be intermittent & the condition is much more common in the lateral than the medial meniscus
  • Lateral meniscus
    • cyst are usually hard & bony just below the level of the joint line
  • Medial meniscus
    • cysts when they do occur are usually larger & softer