Canine Hindlimb Anatomy
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Introduction[edit | edit source]
The hindlimb skeleton of the canine includes the pelvic girdle, consisting of the fused ilium, ischium, and pubis, and the bones of the hindlimb. The size of hindlimb bones varies due to the significant variation in size for breeds of dogs.
Osteology of Pelvic Limb[edit | edit source]
The Pelvic limb bears 40-45% of the weight and provides the majority of the propulsion for locomotion.[1]
Os coxae[edit | edit source]
- Tuber coxae end tubes sacrale both palpable
- Tuber ischii underneath hamstrings
Femur[edit | edit source]
- Greater trochanter lateral to the head of the humerus
- Lesser trochanter distal to head of humerus
- Trochanteric fossa: Caudal depression between the trochanters
- Third trochanter: Lateral aspect distal to greater trochanter
- Extensor fossa. depression on lat condyle for insertion of long digital
extensor.
Femoral trochlea: Groove on cran femur for articulating with patella bound by two ridges of which the medial is thicker.
Patella[edit | edit source]
Fabellae[edit | edit source]
- Two small sesamoid bones embedded in the heads of the gastrocnemius muscle
Tibia[edit | edit source]
- Large tibial tuberosity - patellar ligament
- Cochlea = two grooves seperated by a ridge
Fibula[edit | edit source]
- Does not bear much weight
Tarsals and metatarsals[edit | edit source]
- Dogs and cats have 7 tarsal bones
- Reduced first MT and digit (dew claw) often absent
Joints of the pelvic limb[edit | edit source]
Sacro-iliac[1][edit | edit source]
Type:
- Synchondrosis ( synovial joint - sacropelvic surface of ilium
- Joint capsule present
ROM:
- Minimal Designed for stability
- Accessory movements = rot
Supporting structures:
- Dorsal and ventral Sacroiliac ligaments
- Sacrotuberous
Hip[1][edit | edit source]
Type:
- Ball and socket
- Femoral head and acetabulum of the ilium, ischium and pubis
- A band of fibrocartilage on the rim of the acetabulum deepens acetabulium
ROM:
- FL & Ext
- Minimal - adduction & abduction
Supporting structures:
- Acetabular lip (fibrocartilage) continues as transverse ligament
- Ligament of the femoral head
- Synovial structures and tendon sheaths:
- Large joint capsule
- Internal obturator
Stifle[edit | edit source]
Type:
- Hinge joint with two cartilages/menisci
- Femur & tibia - femorotibial (condylar)
- Femur & patella – femoropatellar (gliding joint)
ROM:
- Flexion and Extension
- At the end of flexion there is int rot
- At the end of extension there is external rotation
Supporting structures:
- Patellar ligament (patella is a sesamoid within the quadriceps tendon)
- Medial collateral ligament fused with joint capsule and med meniscus
- Lat collateral ligament: Separated from lat meniscus by popliteus tendon
- Cranial cruciate ligament: Caudolateral femur to cranial tibial. Prevents anterior translation of tibial relative to femur
- Caudal cruciate ligament: Craniomedial femur to caudal tibia. Prevents candal translation of tibial relative to femur
- Lateral meniscus has extra ligament— meniscofemoral lig
- Connects caudal lat meniscus to femur
- Femoropatellar ligaments – lat and med
- Extend from epicondyles to patella
Hock (tarsal)[edit | edit source]
Type:
- Tarsocrucial joint (TCJ)- greatest movt
- Prox & distal intertarsal joint
- Tarsometatarsal joint
- Intertarsal
ROM:
- TCJ - Flexion & Extension and Lateral & rotatory accessory movts
- Others - small amount or translatory and rotatory ROM:
Ligaments of the tarsal joint:
- Medial & lat collateral (both have long and short parts)
- Intertarsal ligaments
- Prox extensor retinaculum
- Transverse ligament on distal tibia
- Holds down tendons of long digital extensor and cranial tibial
- Distal extensor retinaculum
- Hold down tendon of long digital extensor
- Long plantar ligament - connect calcaneus to metatarsus
- Flexor retinaculum - thickening of deep fascia over plantar aspect of tarsus
- Form the tarsal canal with the tarsal bones containing:
- Tendon and sheath of Deep digital flexor
- Plantar branch of saphenous artery & vein
- Medial & Lateral plantar nerves
Muscles of the Hind Limb[edit | edit source]
Muscle | Origin | Insertion | Action | Nerve Supply |
---|---|---|---|---|
Pectineus | Pubis | Femur | Adduct the limb and flexes the hip | Obturator |
Iliopsoas
Iliacus Psoas |
Ventral surface of the wing of Ilium |
Lesser of trochanter of Femur | Flexes Hip and externally rotates the thigh | Ventral branches of Lumbar Spinal Nerves |
Gracilis | Pubis Symphysis | Medial Tibia | Adduct limb | Obturator |
Adductors | Pubic surface limb symphysis | Adduct limb | Obturator | |
Internal Obturator | Pelvic floor | Trochanteric fossa of the femur | Lateral rotation of femur | Ischiatic nerve |
Gemelli | Ischium | Trochanteric fossa of the femur | Lateral rotation of femur | Ischiatic nerve |
External Obturator | Ventral Surface of pubis Ischium | Trochanteric fossa of the femur | Adduct thigh | Ischiatic |
Quadratus femoris | Ischium | Caudal surface of femur | Extenf hip and adduct thigh | Obturator |
Deep Gluteal | Body of ischium | On or near greater trochanter | Extension
Abduction |
Gluteal |
Muscles of the Hip and Stifle 1[edit | edit source]
Muscle | Origin | Insertion | Action | Nerve Supply |
---|---|---|---|---|
Superficial gluteal | Dorsal to hip joint | Third trochanter | Abduct hip | Gluteal |
Tensore fascia lata | Tuber coxae | Lateral femoral fascia | Hip flexion and stifle extension via
tension on the lateral femoral fascia |
Gluteal |
Biceps femoris | Ischiatic tuberosity | Greater trochanter | Extend and Abduct hip | Gluteal |
Semitendinosus | Ischiatic tuberosity | Tibia and calcaneal tub | Extend hip, flex stifle, extend tarsus | Ischiatic |
Semimembranosus | Ischiatic tuberosity | Femur and Tibia | Extends hip, Flexes or extends stifle | Ischiatic |
Muscles of the Hip and Stifle 2[edit | edit source]
Muscles | Origin | Insertion | Action | Nerve supply |
---|---|---|---|---|
Middle gluteal | Wing of ilium | Greater trochanter | Extension and abduction | Gluteal |
Rectus femoris | Ilium (cranioventral iliac spine) | Patella and patellar tuberosity | Flexes the hip and extends the stifle | Femoral |
Vastus lateralis | Extends the stifle | Femoral |
Muscles of the Stifle, Hock and Pes[edit | edit source]
Nerves of the Pelvic Limb[edit | edit source]
Femoral nerve (L4, L5 sometimes L3, L6)[edit | edit source]
- Musle Innervation - Stifle extensors (quadriceps), llio-psoas.
- Cutaneous Innervation - Medial aspect of limb
Obturator nerve (L5, L6)[edit | edit source]
- Muscle Innervation - Adductors - obturator, add, gracilis
- Cutaneous Innervation - nil
Gluteal nerve (L6, L7, S1)[edit | edit source]
- Muscle Innervation - gluteals, TFL, biceps femoris, semitenndinosus.
- Cutaneous Innervation - nil
Sciatic nerve (L6, L7, S1, S2)[edit | edit source]
- Muscle InnervationMI - biceps femoris, semitendinosus, semimembranosis
- Cutaneous Innervation - see tibial and fibula branches
Tibial nerve (S1, S2)[edit | edit source]
- Muscle InnervationMI - extensors of hock, flexors of digits
- Cutaneous Innervation - caudal aspects o1 the limb below stifle
Fibular nerve[edit | edit source]
- Muscle InnervationMI - flexors of the hock, extensors of the digits
- Cutaneous Innervation - cranial and lat aspects of limb
Resources[edit | edit source]
- bulleted list
- x
or
- numbered list
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