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The Tibia
The leg is the region between the knee joint
and ankle joint
Ankle Joint
Knee Joint
Leg
The region above the knee joint is the thigh
Hip Joint
Knee Joint
Thigh
Leg
Ankle Joint
There are two bones in the leg
There are two bones in the leg
Tibia
There are two bones in the leg
Fibula
There are two bones in the leg
The Fibula
• Lies Laterally • Is shorter• Is not a weight-bearing
bone
There are two bones in the leg
The Tibia
• Lies medially • Is longer than the fibula• Is a weight-bearing bone• Is derived from the Latin
word meaning flute
The Fibula and Tibia are held together by the
Interosseous Membrane
The Tibia is a long bone with expanded proximal and distal
ends with a shaft in between
Proximal end
Distal end
Shaft
right Tibia, anterior view
The Tibia is a long bone and may be divided into
thirds for descriptive purposes
Proximal end
Distal end
Proximal Third
right Tibia, anterior view
Proximal end(Head of the Fibula)
Distal end
Proximal Third
Middle Third
right Tibia, anterior view
The Tibia is a long bone and may be divided into
thirds for descriptive purposes
Proximal end(Head of the Fibula)
Distal end
Proximal Third
Middle Third
Distal Third
right Tibia, anterior view
The Tibia is a long bone and may be divided into
thirds for descriptive purposes
The Tibia articulates proximally at the Knee
Joint
Tibia
FibulaInterosseous Membrane
right Tibia, anterior view
Tibia
FibulaInterosseous Membrane
The Tibia articulates distally at the Ankle Joint
right Tibia, anterior view
The Proximal Tibia
Proximal Tibia
Anterior View Posterior View
right Tibia
The proximal end of the Tibia has two
shelf-like projections known as Condyles
Anterior View
Proximal Tibia right Tibia
Proximal Tibia
Anterior View
Medial Tibial Condyle
Posterior View
right Tibia
Proximal Tibia
Anterior View Posterior View
Lateral Tibial Condyle
right Tibia
The upper surface of the Tibia is referred to as the Tibial
Plateau
Bird’s-Eye View
posterior
anterior
Proximal Tibia right Tibia
The upper surface of the Tibia is referred to as the Tibial
Plateau
Bird’s-Eye View
posterior
anterior
Proximal Tibia
Medial half of Tibial Plateau
right Tibia
The upper surface of the Tibia is referred to as the Tibial
Plateau
Bird’s-Eye View
posterior
anterior
Proximal Tibia
Lateral half of Tibial Plateau
right Tibia
The Tibial Plateau has two articular facets that articulate with the Condyles of the
Femur
Bird’s-Eye View
posterior
anterior
Proximal Tibia right Tibia
Lateral half of Tibial PlateauMedial half of Tibial Plateau
Bird’s-Eye View
posterior
anterior
Proximal Tibia
Between the facets is a non-articular area that features the Intercondylar Eminence
also known as the Tibial Spine
right Tibia
Lateral half of Tibial PlateauMedial half of Tibial Plateau
Menisci 2 crescent-shaped intra-capsular fibrocartilaginous structures
situated one on each Tibial Facet
Superior view proximal Tibia
Medial Meniscus
Lateral Meniscus
anterior
posterior
right Tibia
Menisci Each meniscus has an anterior and posterior horn that provide attachments to stabilise the meniscus
Superior view proximal Tibia
Medial Meniscus
Lateral Meniscus
Anterior horns
Posterior horns
right Tibia
Menisci are wedge-shaped in cross-section
The menisci widen and deepen the
Tibial articular surface that receives the Femoral Condyles
Between the facets is a non-articular area which features the Intercondylar Eminence
also known as the Tibial Spine
Posterior View
Proximal Tibia
LateralMedial
right Tibia
Anteriorly, below the Tibial Plateau is a
prominence of bone
The Tibial Tuberosity
Proximal Tibia
Anterior View
right Tibia
Proximal Tibia
Below the Tibial Plateau is a
prominence of bone
The Tibial Tuberosity
medial view lateral view
right Tibia
The Quadriceps Muscle converges distally onto the Patella, which is the largest sesamoid bone
in the body
The Patella then attaches to the Tibial
Tuberosity via the Patellar Ligament
Tibial Tuberosity
Patellar Ligament
Quadriceps Muscle
right Knee
Gerdy’s Tubercle is a faceted prominence on the anterior surface of
the Lateral Tibial Condyle
Lateral Tibial Condyle
Gerdy’s Tubercle
It receives the distal end of the Iliotibial Tract (band)
Proximal Tibia right Tibia
Attaches to Gerdy’s Tubercle
on the anterior aspect of theLateral Tibial Condyle
Iliotibial Tract
Tensor Fasciae Latae
Gerdy’s Tubercle
Proximally it receives two muscles• Tensor Fasciae Latae• Gluteus Maximus
Iliotibial Tract
right side
Proximal Tibia Posterior View
lateralmedial
Soleal Line
Provides attachment for the Soleus Muscle
right Tibia
Tibial Shaft
The Tibia has 3 borders and 3 surfaces
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
When a patient lies in the scanner, the foot usually points
outwards due to the natural resting position of the body,
and not directly forwards as in the standing position
This means that when interpreting scans remember
that the anterior surface rotates anticlockwise for the right leg and clockwise for the left leg
The Fibula has 3 borders and 3 surfaces
MRI of cross-section through right legLooking up towards the head
Fibula
anterior
posterior
medial
lateral
The Tibia has 3 borders and 3 surfaces
MRI of cross-section through right legLooking up towards the head
Tibiaanterior
posterior
medial
lateral
The Tibia has 3 borders and 3 surfaces
MRI of cross-section through right legLooking up towards the head
Tibiaanterior
posterior
medial
lateral
Anterior
The Tibia has a sharp Anterior Border
Mid-Shaft Tibia cross-section
Posterior
Anterior Border
lateral view
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
The Tibia has a Posterior Border also referred to as the Medial
Border
Mid-Shaft Tibia cross-section
Posterior Border
medial view
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
Anterior Posterior
Anterior
Mid-Shaft Tibia cross-section
Posterior
LateralBorder
lateral view
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
The Tibia has a Lateral Borderalso referred to as the Interosseous Border
Anterior
Mid-Shaft Tibia cross-section
Posterior
LateralBorder
lateral view
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
The Interosseous Membrane attaches here
Interrosseous Membrane
Mid-Shaft Tibia cross-section
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
Anterior border
Posterior border
Lateral border
Mid-Shaft Tibia cross-section
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
Anterior border
Posterior border
Lateral border
Medial Surface
There are no muscle attachments to this surface
Medial Surface
Mid-Shaft Tibia cross-section
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
Anterior border
Posterior border
Lateral border
Lateral Surface
Also known as the Extensor Surface
Cross section through leg approx 10 cm distal to knee joint
anterior
posterior
medial
lateral
Extensor muscles
Mid-Shaft Tibia cross-section
MRI of cross-section through right legLooking up towards the head
anterior
posterior
medial
lateral
Anterior border
Posterior border
Lateral border
Posterior Surface
Also known as the Flexor Surface
Cross section through leg approx 10 cm distal to knee joint
anterior
posterior
medial
lateral
Flexor muscles
Distal Tibia
Anterior View The most prominent feature of the distal Tibia is the Medial
Malleolus
The most prominent feature of the distal Tibia is the Medial
Malleolus
Anterior View
The lateral surface of the Medial Malleolus is covered in articular hyaline cartilage and
articulates with the Talus at the Ankle Joint
Lateral view of distal right Tibia
Lateral surface
The Inferior surface of the Tibia is smooth, covered in articular
hyaline cartilage and articulates with the Talus
Medial Malleolu
s
mediallateral
The Tibia and Medial Malleolus form the medial part of the
articulation of the Ankle Joint
On the lateral aspect, the distal
Tibia articulates with the distal Fibula at the Fibular Notch
mediallateral
lateral view of distal Tibia
Muscle Attachments
Proximal Tibia Anterior View
Iliotibial Band or Tract
Proximally it receives two muscles• Tensor Fasciae
Latae• Gluteus Maximus
Proximal Tibia Anterior View
Iliotibial Band or TractDistally inserts onto
Gerdy’s Tubercle
Iliotibial
Tract
Tensor Fasciae Latae
Gerdy’s Tubercle
Proximal Tibia Lateral View
anteriorposterior
Iliotibial Band or TractDistally inserts onto
Gerdy’s Tubercle
Iliotibial
Tract
Tensor FasciaeLatae
Gerdy’s Tubercle
Proximal Tibia Anterior View Tibialis Anterior
lateral medial
Originates from • Lateral Condyle of Tibia• proximal 2/3rds of lateral surface of Tibia • Interosseous membrane
Proximal Tibia Anterior View Tibialis Anterior
lateral medial
Inserts onto Medial Cuneiform and base of 1st Metatarsal
Originates from • Lateral Condyle of Tibia• proximal 2/3rds of lateral surface of Tibia • Interosseous membrane
Proximal Tibia Anterior View Tibialis Anterior
lateral medial
Inserts onto Medial Cuneiform and base of 1st Metatarsal
• Dorsiflexes ankle• Inverts foot
Originates from • Lateral Condyle of Tibia• proximal 2/3rds of lateral surface of Tibia • Interosseous membrane
Proximal Tibia Lateral View
anteriorposterior
Tibialis Anterior
Inserts onto Medial Cuneiform and base of 1st Metatarsal
• Dorsiflexes ankle• Inverts foot
Originates from • Lateral Condyle of Tibia• proximal 2/3rds of lateral surface of Tibia • Interosseous membrane
SemimembranosusOriginates from superior lateral
quadrant on the posterior surface of the Ischial Tuberosity
Proximal right Tibia Posterior View
lateralmedial
SemimembranosusOriginates from superior lateral
quadrant on the posterior surface of the Ischial Tuberosity
Inserts onto the posterior aspect of the
Medial Tibial Condyle
Proximal right Tibia Posterior View
lateralmedial
SemimembranosusOriginates from superior lateral
quadrant on the posterior surface of the Ischial Tuberosity
• Extends Hip• Flexes and rotates Knee
Proximal right Tibia Posterior View
lateralmedial
Inserts onto the posterior aspect of the
Medial Tibial Condyle
Proximal right Tibia Medial View
posterioranterior
Pes Anserinus
SartoriusGracilis
Semitendinosus
(Meaning Goose’s Foot)
Refers to the partially confluent manner in which the three tendons insert onto the
medial surface of the proximal Tibia
posterioranterior
Pes Anserinus
SartoriusGracilis
Semitendinosus
A useful mnemonic to remember the order
from anterior to posterior is
SayGrace beforeTea
(Meaning Goose’s Foot)
Refers to the partially confluent manner in which the three tendons insert onto the
medial surface of the proximal Tibia
Proximal right Tibia Medial View
posterioranterior
Pes Anserinus
SartoriusGracilis
Semitendinosus
A useful mnemonic to remember the order
from anterior to posterior is
Say - SartoriusGrace - Gracilisbefore Tea - SemiTendinosus
(Meaning Goose’s Foot)
Refers to the partially confluent manner in which the three tendons insert onto the
medial surface of the proximal Tibia
Proximal right Tibia Medial View
posterioranterior
Pes Anserinus
Sartorius
Gracilis
Semitendinosus
(Meaning Goose’s Foot)
Refers to the partially confluent manner in which the three tendons insert onto the
medial surface of the proximal Tibia
Proximal right Tibia Medial View
Proximal right Tibia Posterior View
lateralmedial
PopliteusOriginates from posterior surface of
Tibia superior to soleal line
lateralmedial
PopliteusOriginates from posterior surface of
Tibia superior to soleal line
The tendon passes upward and laterally and courses
through the knee joint before inserting onto the
Lateral Condyle of the Femur
Proximal right Tibia Posterior View
lateralmedial
Popliteus
The tendon passes upward and laterally and courses
through the knee joint before inserting onto the
Lateral Condyle of the Femur
Unlocks the extended knee by laterally rotating the Femur on the Tibia
Originates from posterior surface of Tibia superior to soleal line
Proximal right Tibia Posterior View
lateralmedial
SoleusOriginates from • posterior aspect of Fibular Head • upper 1/3 of posterior surface of
Fibular shaft • along the full length of soleal line• middle 1/3 medial border of Tibial
Shaft
Proximal right Tibia Posterior View
lateralmedial
Soleus
Unites with gastrocnemius aponeurosis to form the Achilles
tendon, inserts middle 1/3 posterior calcaneum
Originates from • posterior aspect of Fibular Head • upper 1/3 of posterior surface of
Fibular shaft • along the full length of soleal line• middle 1/3 medial border of Tibial
Shaft
Proximal right Tibia Posterior View
lateralmedial
Soleus
Plantarflexes the ankle
Originates from • posterior aspect of Fibular Head • upper 1/3 of posterior surface of
Fibular shaft • along the full length of soleal line• middle 1/3 medial border of Tibial
Shaft
Proximal right Tibia Posterior View
Unites with gastrocnemius aponeurosis to form the Achilles
tendon, inserts middle 1/3 posterior calcaneum
lateralmedial
Tibialis PosteriorProximal right Tibia
Posterior View
Originates from• Posterior aspect interosseous
membrane • superior half of posterior surface of tibia distal to soleal line • medial half of posterior surface of
fibula
lateralmedial
Tibialis PosteriorProximal right Tibia
Posterior View
Originates from• Posterior aspect interosseous
membrane • superior half of posterior surface of tibia distal to soleal line • medial half of posterior surface of
fibula
lateralmedial
Tibialis PosteriorOriginates from• Posterior aspect interosseous
membrane • superior half of posterior surface of tibia distal to soleal line • medial half of posterior surface of
fibula
Inserts onto tuberosity of the navicular with extensions to other tarsal bones
and metatarsals 2 - 4
Inverts, adducts, supinates foot Plantar flexes ankle
Proximal right Tibia Posterior View
anteriorposterior
Tibialis Posterior
Inverts, adducts, supinates foot Plantar flexes ankle
Proximal right Tibia Lateral View
Originates from• Posterior aspect interosseous
membrane • superior half of posterior surface of tibia distal to soleal line • medial half of posterior surface of
fibula
Inserts onto tuberosity of the navicular with extensions to other tarsal bones
and metatarsals 2 - 4
Proximal Tibia Posterior View
lateralmedial
Flexor Digitorum Longus
Originates from the posterior surface of Tibia
distal to Soleal Line
Proximal Tibia Posterior View
lateralmedial
Flexor Digitorum Longus
Originates from the posterior surface of Tibia
distal to Soleal Line
Splits into four slips, inserts onto plantar surface of bases of 2nd -
5th distal phalanges
Proximal Tibia Posterior View
lateralmedial
Flexor Digitorum Longus
Originates from the posterior surface of Tibia
distal to Popliteal Line
Splits into four slips, inserts on plantar surface of bases of 2nd -
5th distal phalanges
Flexes toes 2 – 5Plantarflexes ankle
Ligament Attachments
Proximal right Tibia Posterior View
lateralmedial
Posterior Cruciate Ligament
posterioranterior
Tibial or Medial Collateral Ligament of the Knee
Proximal right Tibia Medial View
Proximal right Tibia
posterior
anterior
Anterior Cruciate Ligament
Bird’s-Eye View
medial lateral
Proximal right Tibia
posterior
anterior
Posterior Cruciate Ligament
Bird’s-Eye View
medial lateral
posterior
anterior
Proximal right Tibia
Posterior horn of medial meniscus
Bird’s-Eye View
posterior
anterior
Posterior horn of medial meniscus
Anterior horn of medial meniscus
Proximal right TibiaBird’s-Eye View
posterior
anterior
Posterior horn of lateral meniscus
Proximal right TibiaBird’s-Eye View
posterior
anterior
Posterior horn of lateral meniscus
Anterior horn of lateral meniscus
Proximal right TibiaBird’s-Eye View
posterior
anterior
Posterior horn of lateral meniscus
Anterior horn of lateral meniscus
Posterior horn of medial meniscus
Anterior horn of medial meniscus
Proximal right TibiaBird’s-Eye View
posterior
anterior
Posterior horn of lateral meniscus
Anterior horn of lateral meniscus
Posterior horn of medial meniscus
Anterior horn of medial meniscus
Proximal right TibiaBird’s-Eye View
Muscle Summaries
Tensor Fasciae LataeOrigin Anterior superior iliac spine, outer
lip of anterior iliac crest and fascia lata
Insertion Via the Iliotibial band onto Gerdy’s tubercle on superior tibia
Action Assist gluteus maximus in maintaining extended knee, abducts hip
Nerve Supply Superior gluteal nerve (L4, L5, S1)
Blood Supply Superior gluteal and lateral circumflex femoral artery
Anterior Thigh
SartoriusOrigin Anterior superior iliac spine
Insertion Superior aspect of the medial surface of the tibial shaft near the tibial tuberosity
Action Flexes and laterally rotates the hip joint and flexes the knee
Nerve Supply Femoral nerve (L2, L3, L4)
Blood Supply Femoral artery
Anterior Thigh
GracilisOrigin Inferior ramus of pubis, and
adjacent ramus of ischium
Insertion Medial surface upper tibial shaft, posterior to sartorius
Action Adducts hip, flexes the knee, medially rotates tibia on femur
Nerve Supply Anterior division obturator nerve (L2, L3)
Blood Supply Obturator artery, medial circumflex femoral artery, profunda femoris artery
SemitendinosusOrigin Superior medial quadrant,
posterior surface ischial tuberosity
Insertion Superior aspect, medial tibial shaft
Action Extends hip, flexes and medially rotates knee
Nerve Supply Tibial portion sciatic nerve (L5, S1)
Blood Supply Perforating branches of profunda femoris artery, inferior gluteal artery, superior muscular branches of popliteal artery
Posterior thigh
SemimembranosusOrigin Superior lateral quadrant of
posterior surface ischial tuberosity
Insertion Posterior surface of the medial tibial condyle
Action Extends hip, flexes and medially rotates the knee
Nerve Supply Tibial portion of sciatic nerve (L5, S1)
Blood Supply Perforating branches of profunda femoris artery, inferior gluteal artery, and the superior muscular branches of popliteal artery
Posterior thigh
PopliteusOrigin Posterior surface of tibia, superior
to soleal line
Insertion Lateral surface of lateral condyle of femur.The tendon passes into the capsule of the knee to the posterior part of the lateral meniscus
Action Unlocks the extended knee by laterally rotating the femur on the tibia.
Nerve Supply Tibial nerve (L4, L5, S1)
Blood Supply Medial inferior genicular branch of popliteal artery muscular, posterior tibial artery
Posterior Leg
SoleusOrigin Posterior aspect of fibular head,
posterior surface of upper fibular shaft, soleal line on posterior tibia and medial border of tibia
Insertion unites with gastrocnemius aponeurosis to form the Achilles tendon, inserts onto posterior and upper surfaces of calcaneum
Action Plantar flexor of ankle
Nerve Supply Tibial nerve (S1, S2)
Blood Supply Posterior tibial, peroneal, and sural arteries
Posterior Leg
Tibialis PosteriorOrigin Posterior aspect interosseous
membrane, superior half of tibia and medial posterior surface of fibula
Insertion Inserts onto navicular tuberosity and sends extensions to other tarsal bones and metatarsals
Action Inverts, adducts, supinates foot, plantar flexes ankle
Nerve Supply Tibial nerve (L4, L5)
Blood Supply sural, peroneal and posterior tibial arteries
Posterior Leg
Flexor Digitorum LongusOrigin Posterior surface of tibia distal to
soleal line
Insertion Splits into four slips, inserts on plantar surface of bases of 2nd - 5th distal phalanges
Action Flexes toes 2 – 5Plantarflexes ankle
Nerve Supply Tibial nerve (S1, S2)
Blood Supply Muscular branch of posterior tibial artery
Posterior Leg
Flexor Hallucis LongusOrigin Inferior 2/3 of posterior surface
of fibula, lower part of interosseous membrane
Insertion Plantar surface of base of distal phalanx of great toe
Action Flexes great toe, weak ankle plantar flexor
Nerve Supply Tibial nerve (S2, S3)
Blood Supply Muscular branches of peroneal and posterior tibial artery
Posterior Leg
Tibialis AnteriorOrigin Lateral condyle of tibia, proximal
2/3rds lateral surface tibia, interosseous membrane
Insertion Medial and plantar surfaces of medial cuneiform and base of first metatarsal
Action Dorsiflexor of ankle, invertor of foot
Nerve Supply Deep peroneal nerve (L4, L5)
Blood Supply Anterior tibial artery
Anterior Leg
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