H
Hyaluronic acid
Hyaluronic acid is a lubricating substance commonly used for knee injections in patients with knee arthritis.
Hydrogel
Hydrogels are three-dimensional (3D) cross-linked networks that swell in water and can be used as scaffold for seeding cells and growth factors into tissues such as cartilage defects.
Hyperextension
Hyperextension is when the knee can bend a bit backwards. Page updated November 2023 by Dr Sheila Strover (Clinical Editor)
Hyperextension injury
A hyperextension injury is one caused by excessive hyperextension (knee bending backwards). Page updated July 2024 by Dr Sheila Strover (Clinical Editor)
Hypermobility
Hypermobility means that the joints are unusually mobile. Page updated July 2023 by Dr Sheila Strover (Clinical Editor)
Hypermobility syndrome
A hypermobility syndrome is a group of symptoms and signs tending to occur together and in which the joints are unusually mobile.
Hypertrophic
Hypertrophic is a descriptive term for abnormal overgrowth of an organ or a tissue.
Hypertrophy
Hypertrophy means excessive growth.