FEMUR
DR. LOVELY MAUSAMI
TUTOR, DEPT OF ANATOMY,
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NMCH, JAMUHAR.Longest and strongest bone in the body.
Parts:
1.Upper end
2.Shaft
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3.Lower endAt the upper end it articulates with the hip
bone to form the hip joint, and at the lower end
it articulates with the patella and tibia.
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The femur transmits body weight from the hipbone to the tibia in standing position.
SIDE DETERMINATION
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The side of femur is determined by holding bonevertically in such a way that:
Its head faces upward, medially, and slightly
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forward.
Long axis of the shaft is directed downward and
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medially with convexity of the shaft facinganteriorly.
Lower surfaces of both the condyles are in the same
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horizontal plane.UPPER END:
It possesses:
1. Head
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2. Neck3. Greater trochanter: 3 surfaces and 1 border
a) anterior surface
b) lateral surface
c) medial surface
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d) superior border4. Lesser trochanter
UPPER END:
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vHEAD:? Projects from the medial side of upper end
the shaft.
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? Faces upward forwards and medially.? It forms about two-third of a sphere and
articulates with the acetabulum of the hip
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bone to form the hip joint.? It presents a small pit, the fovea, just below
and behind the centre, which provides
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attachment to the ligament of the head of
femur (ligamentum teres femoris).
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? Lies within the capsule of hip joint.v NECK:
It is 5 cm long and connects the head with the
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shaft.
It is directed upward, medially, and slightly
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forward.The angle between its lower border and the
medial border of shaft is called neck?shaft
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angle.The neck presents two borders--upper and
lower, and two surfaces--anterior and
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posterior.UPPER BORDER:
It is concave and horizontal.
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It meets the shaft near the greater trochanter.LOWER BORDER:
It is straight and oblique.
It meets the shaft near the lesser trochanter.
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ANTERIOR SURFACE:It is flat and bears a number of oblique bony ridges.
It meets the shaft at intertrochanteric line.
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It is completely intracapsular.POSTERIOR SURFACE:
It is convex from above downward and
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concave from side-to-side.
It meets the shaft at intertrochanteric
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crest.Its medial half is intracapsular.
It presents a faint groove, which lodges
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the tendon of obturator externus.v GREATER TROCHANTER:
It is a quadrilateral elevation,
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projecting upward from the lateralaspect of the junction of neck and
shaft.
It presents:
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1. One border (upper)2. Three surfaces (anterior, medial,
and lateral).
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UPPER BORDER:
Its posterior part presents the apex
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or tip of greater trochanter, whichprovides attachment to the piriformis.
ANETERIOR SURFACE:
It provides attachment to the gluteus
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minimus on a ridge in its lateral part.
MEDIAL SURFACE:
It presents two depressions:
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A depression (trochanteric fossa) at its junction withthe neck for insertion of obturator externus.
A shallow depression above and in front of
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trochanteric fossa for insertion of obturator internus
along with the gemellus superior and gemellus inferior.
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LATERAL SURFACE:It is quadrilateral and divided diagonally by an oblique
ridge into the upper and lower triangular areas.
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The ridge provides attachment to the gluteus mediusmuscle.
The triangular areas--anterior and posterior to the
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ridge are related to the trochanteric bursae of the
gluteus medius and gluteus maximus, respectively.
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v LESSER TROCHANTER:
It is a conical projection arising from
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the posteromedial surface of the neck?shaft angle.
It is directed medially.
Its apex provides attachment to the
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psoas major.
Iliacus is attached to its base on the
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front.Intertrochanteric line
It continues downward and medially below the
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lesser trochanter on the posterior aspect of femur
as spiral line.
It provides attachment to two ligaments and two
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muscles:
(a) Capsule of the hip joint.
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(b) Iliofemoral ligament (strongest ligament in thebody).
(c) Vastus lateralis to its upper end.
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(d) Vastus medialis to its lower end..
Intertrochanteric crest
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It extends from the posterosuperior angle ofgreater trochanter to the tip of lesser trochanter.
It presents a rounded tubercle near the middle
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called quadrate tubercle, which provides
insertion to the quadratus femoris.
SHAFT:
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The shaft of femur presents:
1. Borders: Medial border
Lateral border
Posterior border.
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2. Surfaces: (4 surfaces in upper and lowerthirds but only 3 surfaces in middle third.)
Anterior surface
Medial surface
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Lateral surface.BORDERS:
Medial border: rounded, ill defined, separates
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anterior from medial surface.
Lateral border: rounded: rounded ill defined.
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Separates anterior from the lateral surface.Posterior border/ linea aspera:
It is thick roughened crest opposite the middle third
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of the shaft.Possesses a lateral and a medial lip and an
intermediate area.
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Medial lip is continuous above with spiral line and
below with supra condylar ridge while the lateral lip is
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continuous above with gluteal tuberosity and belowwith the lateral supra condylar ridge.
SURFACES:
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1. ANTERIOR SURFACE: is smooth andconvex and lies between medial and lateral
borders.
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2. LATERAL SURFACE: faces backwards andlaterally and lies between lateral and posterior
borders.
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3. MEDIAL SURFACE: faces backwards andmedially and lies between posterior and medial
borders. It does not give attachment to any
muscle but is covered by vastus medialis muscle.
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UPPER POSTERIOR:Lies between spiral line medially and gluteal
tuberosity laterally. spiral line is continuous
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above with lower end of trochanteric line and
below with medial lip of linea aspera.
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Gluteal tuberosity is a bony ridge which iscontinuous below with the lateral lip of linea
aspera.
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Attachments:(from lateral to medial side):
gluteus maximus, adductor magnus,
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adductor brevis, pectinius, illiacus andvastus mediallis.
LOWER POSTERIOR:
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Lies between medial and lateral
supracondylar lines which are continuous
above and medial and lateral lip of linea
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aspera respectively.It is also called the popliteal surface
because it forms the floor of popliteal
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fossa.ATTACHMENTS TO THE SHAFT:
Vastus intermedius
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Articularis genuVastus lateralis
Vastus medialis
Gluteus maximus
Adductor magnus
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PectiniusAdductor brevis
Adductor longus
Biceps femoris
Plantaris
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GastrocenimiusLateral and medial intermuscular septa are attached to the
linea aspera.
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Arrangement of stuctures on linea aspera:
(medial to lateral)
1. Vastus medialis
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2. Medial intermuscular septum3. Adductor brevis ( in the upper part)
4. Adductor longus ( in the lower part)
5. Adductor magnus
6. Posterior intermuscular septum
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7. Short head of biceps femoris8. Lateral intermuscular septum
9. Vastus lateralis
10. Vastus intermedius
Mnemonic: (lateral to medial)
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I- vastus INTERMEDIUS
LOVE- vastus LATERALIS
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B- short head of BICEPS femorisMR- adductor MAGNUS
B- adductor BREVIS
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LOVES ? adductor LONGUS
ME- vastus MEDIALIS
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LOWER END:Broadly expanded.
To provide good bearing surface for
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transmitting the body weight to the upper endof tibia.
Has two articular surfaces: patellar and tibial
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articular surfaceConsists of two thick masses of bone called
medial and lateral condyles separated from
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each other by intercondylar fossa.MEDIAL CONDYLE:
More prominent.
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Adductor tubercle: small projection at the
uppermost part of medial condyle. Adductor
magnus is inserted on the tubercle.
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Medial epicondyle: a low rounded elevation on the
medial aspect and lies below and a little in front of
adductor tubercle. It gives attachment to medial
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collateral ligament of knee.Its lateral surface forms the medial wall of
intercondylar fossa.
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LATERAL CONDYLE:Smaller but stronger then medial condyle.
Lateral epicondyle: a low rounded elevation on
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lateral aspect. It gives attachment to lateral
collateral ligament of knee.
There is a groove between the epicondyle and
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articular margin.
Popliteus arises from anterior part of the groove
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while its posterior part lodges the tendon of themuscle in full flexion of knee.
Its medial surface forms lateral wall of intercondylar
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fossa.INTERCONDYLAR FOSSA/ NOTCH:
It is a deep notch, which separates two condyles
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posteriorly.It is limited posteriorly above by intercondylar line.
It presents medial and lateral walls and floor.
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Medial wall of the fossa provides attachments to the
upper end of posterior cruciate ligament in its
anteroinferior part.
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Lateral wall of the fossa provides attachment to the
upper end of anterior cruciate ligament in its
posterosuperior part.
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MNEMONIC:
L ? Lateral condyle provides
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attachment to:A - Anterior cruciate ligament.
M - Medial condyle provides
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attachment to:P ? Posterior cruciate ligament.
ARTICULAR SURFACE:
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Articular surface has the shape ofinverted `V'.
It is divided into 2 parts:
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a) Upper patellar surface: for articulationwith patella.
b) Lower tibial surface: for articulation
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with condyles of tibia.
PATELLAR SURFACE:
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Forms the upper part of articular surfaceand articulates with patella.
It extends over the anterior surface of
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both condyles but more on the lateral
condyle.
It is separated from the tibial surface by
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two faint grooves, each of which is
related to respective miniscus during full
extension of knee.
TIBIAL SURFACE:
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Forms the posterior and inferior parts of the
articular surface of each condyle.
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It is convex.Divided into medial and lateral parts by
intercondylar fossa.
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Above and in front the two parts are conyinuous
with the patellar surface.
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The tibial articular surfaces articulate with thecondyles of tibia with semilunar cartilages
intervening
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