Although the ACL is an intra-articular ligament, it is extrasynovial and composed primarily of type I collagen with viscoelastic properties similar to other ligaments.

Calcium pyrophosphate dihydrate crystal deposition can occur in spinal structures such as intervertebral discs ligaments articular cartilage synovium and joint capsules16.

Methods Surplus flaps of 43 hip articular megalocapsules in 32 cases were used to reconstruct iliofemoral ligaments.