H
Habitual dislocation
Habitual dislocation of the patella is when the knee dislocates every time it is flexed (bent) and the patella does not re-locate until the knee is straightened again.
Haemangioma
A haemangioma is a kind of blood vessel tumour formed by the overgrowth of blood vessel lining cells.
Haemarthrosis
Haemarthrosis is bleeding into a joint (haem' means blood and 'arthrosis' means joint).
Haematoma
A haematoma is a collection or pooling of blood in an area of the body, creating a clotted lump.
Haemopoietic stem cells
A haemopoietic stem cell is a stem cell derived from blood or bone marrow that is capable of differentiating into the various cells of the blood.
Hamstring
A hamstring is one of three muscles at the back of the thigh - semitendinosus, semimembranosus or biceps femoris - which work to bend the knee.
Hamstring graft
A hamstring graft is a prepared ligament graft employing a harvested hamstring tendon.
Hamstrings
The 'hamstrings' or 'hamstring muscles' are the muscles at the back of the thigh - semimembranosus, semitendinosus and biceps femoris. Page updated July 2024 by Dr Sheila Strover (Clinical Editor)
Hamstrings autograft
A hamstrings autograft is when one or more hamstrings tendons are surgically removed and prepared for use as a graft elsewhere in the same person, eg reconstructing a torn anterior cruciate ligament.
Hamstrings curl
The hamstrings curl with a Swiss ball helps to build up both the hamstrings and the lower back muscles.