Table 1 Details of seven patients with lipoma arborescens of the knee

Age

39

53

53

37

34

57

40

Gender

Woman

Woman

Woman

Man

Man

Man

Woman

Additional conditions/situations

None

None

None

Marathon runner

-Lymphoma B

-High blood pressure

None

-Dyslipidemia

-Obesity

-Smoking

-Alcoholism

Trigger or particular debut

None

None

None

After a twist playing soccer

None

Sudden, oppressive and atraumatic left knee pain with a large effusion

None

Prior to surgery

12 months

37 months

30 months

4 months

11 months in the right knee

23 months

10 months

Prior to surgery Physical symptoms and Findings

Recurrent effusions and discomfort

Recurrent effusions, swelling and a large palpable supra-patellar mass

Recurrent effusions and anterior knee pain

Soft tissue palpable mass above the superior aspect of the patella and anterior knee pain

Recurrent effusions, pain and swelling in both knees

Oppressive left knee pain.

Pain, swelling and recurrent effusions

Laterality

Right

Right

Right

Left

Bilateral

Bilateral

Left

Treatment

AS

OS

2 AS. PFA*. 1 AS after PFA

AS

AS in both knees

OS in the left knee, no treatment in the right knee

AS

Results

Pain free. No effusions

Pain free. No effusions

Still pain. Still effusions

Pain free. No effusions

Asymptomatic in both knees

The symptoms of the left knee subsided almost completely. Still pain in the right knee

Pain free. No effusions

Surgical Findings

Bright yellow villi in the whole suprapatellar pouch

Large, pedicled and encapsulated tumor

Synovitic villi in the whole knee

Synovitic villi in the suprapatellar pouch

Synovitic villi at the suprapatellar pouch of both knees

An elongated diffuse synovial proliferation in the whole knee

Synovitic villi in the whole knee

Follow up

14 months

22 months

25 months

12 months

27 months in the right knee

29 months

44 months

Evidence of osteoarthritis

No

Yes

Yes

No

Yes, in the left knee

Yes, in both knees

No