i.m.

Abbreviation for intra-muscular (e.g. an injection)

i.v.

This means intravenous, injected into the vein

Idiopathic

Arising of its own accord; in the case of diseases idiopathic means that the cause of a disease is not known; idiopathic arthrosis = arthrosis without any recognisable cause or without any cause known so far

Iliosacral joint

Joint between the ilium bone und the sacrum, i.e. end of the rear pelvic ring

Ilium

This is actually os ilium, Latin for ilium bone

Immobilisation

Lack of movement, restriction of movement, e.g. in the case of a limb or a part of the body

Implant

Artificial functional part that is implanted into the body as a replacement

Indication

The area of application for a medicine or surgery

Infection

The penetration of germs, such as bacteria, into the body

Infra

Prefix for under, after, later

Infusion

Administration of medicines or solutions of active agents into the vein

Initial pain

This means that the start of a movement, e.g. that of a person suffering from arthrosis, is painful. The pain partly abates after the patient has been moving for some time as the joint is then sufficiently well «lubricated»

Inlay

The sliding surface of an artificial joint that is put into a metal case and that serves as a partner for the prosthesis head

Insert

This has the same meaning as inlay

Instrument

In this context a surgical tool, apparatus

Inter

between

Intern

inside

Intra

Prefix meaning inside

Intra-articular

This means located inside a joint

Isometric muscular contraction

The tensing of a muscle without any visible contraction of the muscle

Isotonic muscular contraction

The visible contraction of a muscle at constant tension

-itis

Suffix that always indicates an inflammation and a sudden pathological condition, e.g. gonitis: inflammation of the knee joint