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Posterolateral Corner
Anatomy, Physical Examination
and Imaging
Uğur GÖNÇ, MD
Çankaya Hospital
Dept. Orthopedics and Traumatology
ANKARA
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Lateral Anatomy of Knee
• Complex anatomy
• Many variations
• Inconsistent terminology
DARK SIDE OF THE KNEE
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Philogenetical Evalution
• 360 million years ago tibio-femoral joint
fibulo-femoral joint
• Distal migration of fibula tibio-fibular joint
– Femoral capsular attachments lateral collateral structure
– Fibulofemoral meniscus intra-articular popliteus
tendon
– Fibular attachments of popliteus popliteofibular ligament Çanka
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Dynamic Components
• Popliteus muscle and tendon
• Biceps femoris muscle
• Lateral gastrocnemius muscle
• Iliotibial band
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Static Components
• Lateral collateral ligament
• Fabellafibular ligament
• Arcuate ligament
• Popliteofibular ligament
• Posterolateral capsule
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Topographic Anatomy
Seebacher – 1982
• Superficial layer
• Middle layer
• Deep layer
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Superficial Layer
• Iliotibial band
• Biceps femoris
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Superficial Layer
Biceps femoris
Peroneal nerve
Iliotibial band
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Superficial Layer
Gerdy tubercule
Lateral fibular head
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Superficial Layer
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Middle Layer
• Quadriceps retinaculum
• Patellofemoral ligaments
– Proximal
– Distal
• Patellomeniscal ligament
Quadriceps Patella
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Deep Layer
• Lateral collateral lig.
• Popliteal complex
– Popliteus tendon
– Popliteal hiatus
– Popliteofibular lig.
• Fabellofibular lig.
• Arcuate lig.
• Lateral capsule
– Coronary lig.
– Midlateral capsular lig. Çanka
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Lateral Collateral Lig.
• Lateral epicondyle
– 1.4 mm prox., 3.1 mm post.
• Lateral fibular head
– 8 mm posterior to ant. border
• 6-7 cm length
0.5-1 cm width
• Prox-ant distal-post
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Lateral Collateral Lig.
Biseps tendon Çan
kaya
Orto
pedi
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Popliteus Complex
• Dynamic component – Popliteus muscle
– Popliteus tendon
• Static component – Popliteomeniskal fascicle
– Popliteofibular lig.
Lateral collateral
lig.
Popliteofibular
lig.
Lateral gastrocnemius
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Popliteus Tendon
• 450 at coronal and sagittal plane
• Popliteus muscle tibia post.
• LFC ant. 1/5 of popliteal sulcus
• Popliteal hiatus intraarticular
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LKL
Popliteus tendon
Popliteus Tendon
LKL
Popliteus tendon
Popliteus muscle
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Popliteus Tendon
• Wider insertion
• Anterior and distal to LKL
• 18.5 mm distance
Popliteal sulcus
Lateral epicondyle
LKL
Popliteus tendon
LaPrade RF, Am J Sports Med, 2003 Çan
kaya
Orto
pedi
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Popliteus Tendon
Lateral collateral lig.
Popliteus tendon
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Popliteus Tendon
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Popliteal Hiatus
• Posterior border
– Posterosuperior popliteomeniscal fascicle
• Anterior border
– Anteroinferior popliteomeniscal fascicle
• Stabilization of lat. meniscus
PSPF AİPF
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Popliteal Hiatus
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Popliteofibular Lig.
• Present in 95-100 %
• Popliteus muscle-tendon junction
• Medial fibular head
• 1.5 cm length
7 mm width
• Anterior and posterior divisions
– Inverted Y shape
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Popliteofibular Lig
PFL
LKL
Popliteus tendon
Popliteomeniscal fascicle
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Fabellofibular Lig.
• “Short lateral ligament”
• Fabella – posterolateral styloid
• In absence of fabella
– Posterior supracondylar process
– Lateral gastrocnemius fibers
• Present in 40 %
PT
LKL
FFL
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Arcuate Lig.
• Lateral limb
– Lateral styloid post. capsule
• Medial limb
– Lateral styloid oblique popliteal lig.
• Present in 70 %
Arcuate lig.
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Variations
• Bony fabella FFL
• Cartilage fabella FFL + AL
• Absence of fabella AL
Seebacher JR, JBJS Am, 1982
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Joint Capsule
• Superficial layer
– Lateral collateral lig.
– Fabellafibular lig.
• Deep layer
– Popliteal hiatus
– Arcuate lig.
– Popliteofibular lig.
– Coronary lig.
Coronary l. Popliteus muscle Arcuate l.
L.I.G. artery
Peroneal n.
Popliteus tendon
Lat. Col. l.
Fabellofibular l.
Biseps tendon
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Joint Capsule
• Midlateral capsular lig.
– Lateral capsule
• Coronary lig.
– Posterior capsule
• Stabilization of meniscus
– Meniscotibial component
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PLC Biomechanics
• Main structures
– Lateral collateral lig.
– Popliteus tendon
– Popliteofibular lig.
• Secondary structures
– Fabellafibular lig.
– Arcuate lig.
– Iliotibial band
– Biceps femoris
– Lateral gastrocnemius Çanka
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Biomechanics
Strength Stiffness
LKL 295 N 33.5 N/m
PFL 298 N 28.6 N/m
Popliteus 700 N 83.7 N/m
LaPrade RF, Am J Sports Med, 2005 Çanka
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Biomechanics
Posterolateral structures
• Varus (LKL)
• External rotation (popliteus)
• Posterior translation
Posterior Cruciate lig.
• Varus-external rotation
(at 900 flexion)
Primary restraint
Secondary restraint
Secondary restraint
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LKL Biomechanics
• 00 - 300 primary varus restraint
• 00 - 300 ex. rotation restraint
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PT Biomechanics
• Dynamic restraint
• 200 - 1300 ex. rotation restraint
(more prominent at 600 flexion) LaPrade RF, Am J Sports Med, 2004
• 00 - 900 varus restraint
• Full ext. post. translation restraint
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PFL Biomechanics
• Isometric ligament
• In all flex. degrees ex. rotation restraint
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PCL Biomechanics
• Post. translaslayon primary restraint
• Varus secondary restraint
– In LKL insufficiency
• Ex. rotation secondary restraint
– In PLC insufficiency
– At 900 flexion
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PLC Injury
• Increased pressure at medial and patellofemoral compart.
• Increased loading of PCL at external rotation
• Increased loading of ACL at internal rotation
Çanka
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Functional Biomechanics
• LKL isolated 300 flexion 1-40 varus
• LKL + PLC 300 flexion varus
300 flexion ext.rot.
• LKL + PLC + PCL varus
900 flexion ext.rot.
posterior translation
• LKL + PLC + ACL anterior translation
internal rotation Çanka
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PLC Injury
• Hyperextention – varus loading
– Direct blow to ant-med tibia
– Rotational trauma
• Varus loading at flexion
• High energy injury !!
• Isolated PLC injury 16 %
– Cruciate ligament injury
– Reduced knee dislocation
Çanka
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Physical Examination
Acute period
• Posterolateral tenderness
• Posterolateral echymosis
• Effusion intraarticular
pathology
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Soft Tissues
Çanka
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Vascular Injury
• Incidence 4 - 35 %
• Angiography
• Ater 6 hours 68 % amputation
Çanka
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Peroneal Nerve Injury
• Incidence 4 - 50 %
• Sensory / complete motor loss
• Recovery is not always
possible
Cush G, Sports Med Arthrosc. 2011
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Associated Injuries
• ACL and PCL
• Patellar tendon
• Examination under anesthesia
– Varus
– External rotation
– Cruciate ligaments
Çanka
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Chronic Period
• Joint motion
• Limb alignment
– Varus
• Gait
– Hyperextension-varus thrust
– Gait in flexion
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Rotational Instability
• Posterolateral rotational instability
– PLC + PCL
• Anterolateral rotational instability
– PLC + ACL
Çanka
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PLRI
• varus
• external rotation
• posterior translation
Çanka
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Varus Stress Test
• 300 flexion
– Isolated LKL 1-40 varus
– PLC / PCL Varus
• 00 flexion
– PCL injury !!
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“Dial” Test (posterolateral rotation test)
• 300 flexion
– PLC injury
• 900 flexion
– PLC + PCL injury
• 100 difference
Çanka
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“Dial” Test
Çanka
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External Rotation
Recurvatum Test
• PLC + PCL
• Posterior and lateral
subluxation of tibia
– Hyperextention
– External rotation
– Varus
Çanka
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External Rotation
Recurvatum Test
Çanka
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Posterolateral Drawer
Test
• PLC + PCL
• 900 knee flexion
• 150 ankle ext. rot.
Çanka
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Apprehension Test
Çanka
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Associated Injuries
• PCL
– Posterior drawer
(increases with PLC injury)
– Reverse pivot “shift” test
• ACL
– Anterior drawer
– Pivot “shift” test
Çanka
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Arthroscopic Examination
Çanka
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Direct Radiography
• Knee dislocation
• Avulsion fractures
– Fibular head
– Segond fracture
– Femoral side
– Gerdy tubercule
• Tibia plateau fractures
Çanka
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Fibular Head
• “Arcuate sign”
• Pathognomonic for PLC
• PFL avulsion
– Fibular styloid
– Small fragment
– Displaced medially and superiorly
• LKB ve biceps avulsion
– Fibular head
– Bigger fragment
– More displacement
Çanka
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Segond Fracture
• Lateral Segond fracture
– Midlateral capsular lig.
– ACL injury
– PLC injury
• Medial Segond fracture
– PCL injury
– PCL + PLC injury
Çanka
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Femoral Side
Çanka
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Stress Radiographs
• Evaluation of LKL
• 4 mm difference PLC injury
LaPrade RF, JBJS Am, 2008
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Standing Hip-to-ankle
Radiographs
• Chronic PLC injury
– Varus-recurvatum
– Varus reconstruction failure
• HTO first !!
• Open wedge HTOincreases varus and
ext. rotation stability
LaPrade, Am J Sports Med, 2008
Çanka
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Magnetic Resonance
• Essential for treatment planning
• All PLC structures
– PFL visible in 50-60 %
• Associated injuries
– Cruciate ligaments
– Meniscus, cartilage injury
– Occult fractures
• Thin cut coronal oblque series !!
Yu JS, Radiology, 1996
LaPrade RF, Am J Sports Med, 2000 Çan
kaya
Orto
pedi
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LKL
normal Grade III
Çanka
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Popliteus Tendon
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PFL
Çanka
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Occult Fractures
Çanka
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Posterolateral Corner
• Complex anatomy
• Part of multiple ligament injuries
– Varus-ext.rotation deformity
• Other reconstructions fail unless PLK is treated
• Physical examination
– PLC / PCL
– “Dial” test
• MR is essential for treatment planning
– All PLC structures can be evaluated Çanka
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