Synonyms
OSG, Articulatio talocruralis
Definition
The upper ankle joint is one of two ankle joints that allow movement between the lower leg and foot. It is an optimal combination of the two. It forms a functional unit with the lower ankle joint.
- Stability and
- Mobility.
Ankle joints in general
Strictly speaking, the ankle joint consists of two joints. The upper and the lower ankle joint. It provides the articulated connection between the lower legs, consisting of The ankle joints must fulfill two essential characteristics. They must be stable and resilient, as they carry the entire weight of the body, but at the same time allow a high degree of mobility to ensure walking and running – even on uneven terrain.
- Shin bone (tibia) and
- Fibula (fibula) and
- Foot.
Upper ankle joint – Anatomy
The upper ankle joint consists of the articular surface of the lower leg (crus), i.e. the tibia and fibula with their raised joint ends form the so-called malleolus fork (malleolus = ankle), which surrounds the ankle bone roll (trochlea tali) the uppermost part of the ankle bone. The raised bone end of the tibia, which corresponds to the inner part of the malleolus fork, forms the inner malleolus, the lower bone end of the fibula, i.e. the outer part of the malleolus fork, forms the outer malleolus. The trochlea tali enclosed by the malleolar fork is 4-5 mm wider at the front than at the back. This special feature is functionally important (see below).
Ligamentous apparatus of the upper ankle joint
The OSG (upper ankle joint) is secured by ligaments in addition to bone guidance. The ligaments that clamp and thus stabilize the malleolar fork as a so-called syndesmosis (syndesmosis tibiofibularis) already belong to the ligaments of the OSG (upper ankle joint). Since the OSG (upper ankle joint) is a purely hinged joint, there are collateral ligaments (collateral ligaments) that prevent lateral movement of the foot in the OSG (upper ankle joint).
They move from the malleoli (ankles) to the nearest tarsal bones. In detail, at the outer ankle these are the In their entirety they are simply called the outer ligament of the foot. These ligaments prevent a varisation or inversionsupination of the foot (i.e. a rotation inwards, as you do when you want to look at the sole of your foot). The collateral ligament of the inner ankle is the broad ligamentum deltoideum, which consists of four parts: This ligament prevents the valgization or eversionPronation of the foot (i.e. rotation outwards).
- Ligamentum tibiofibulare anterius and the
- Ligemantum tibiofibulare posterius.
- Ligamentum talofibulare anterius,
- Ligamentum talofibulare posterius and
- Ligamentum calcaneofibulare.
- Pars tibiotalaris anterior,
- Pars tibiotalaris posterior,
- Pars tibiocalcanea and
- Pars tibionavicular.
- Ligamentum fibulotalare posterius
- Ligamentum fibulocalcaneare
- Ligamentum fibulotalare anterius
- Fibula (fibula)
- Shinbone (Tibia)
- Hock leg (talus)
- Scaphoid (Os naviculare)
- Sphenoid bone (Os cuniforme)
- Metatarsal bone (Os metatarsale)
- Cuboid bone (Os cuboideum)
