These three pairs of articulating surfaces are all enclosed within one capsular ligament.
"Lameness of the Horse" by John Victor Lacroix
The capsular ligament, except in hydrops, is the seat of connective-tissue overgrowth, and tends to become contracted and rigid.
"Manual of Surgery" by Alexis Thomson and Alexander Miles
The capsular and other ligaments are slack, so that the joint is unstable and easily hyper-extended.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition." by Alexander Miles
Mallory calls this capsular-glomerulonephritis.
"Arteriosclerosis and Hypertension:" by Louis Marshall Warfield
The tendon of the popliteus muscle is an intra-capsular structure, and is therefore covered with a synovial sheath.
"Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 5" by Various
This capsular membrane is the first appearance of the membrana granulosa.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour