🩺 Orthopedic Ultimate Exam Guide (Part 2)

1. Pelvic Fractures

Anatomy & Mechanisms of Pelvic Injury
  • Anatomy: A ring structure of 3 bones (two innominate bones + sacrum). Joined by symphysis pubis (anterior bridge) and sacroiliac joints/ligaments (posterior bridge). The strongest ligaments are the sacroiliac & iliolumbar.
  • Mechanism of Injury:
    • Antero-posterior compression: Frontal collision. "Open-book fracture". Gap < 2cm suggests stable; > 2cm indicates instability.
    • Lateral compression: Side-to-side. Ring buckles/breaks. Pubic rami fracture anteriorly + SI strain/fracture posteriorly.
    • Vertical Shear: Fall from height onto one leg. Vertical displacement. High risk of retroperitoneal hemorrhage.
  • Complications: Hemorrhage (can be fatal), Visceral damage (Urethra, Bladder), Nerve injury (Sciatic).
Classification & Management of Pelvis Fractures
  • Tile Classification:
    • Type A (Stable): A1 (avulsion, not involving ring), A2 (stable, minimally displaced).
    • Type B (Rotationally unstable, vertically stable): B1 (Open-book), B2 (Lateral compression ipsilateral), B3 (Lateral compression contralateral/bucket handle).
    • Type C (Rotationally and vertically unstable): C1 (Unilateral), C2 (Bilateral), C3 (Associated acetabular fracture).
  • Management:
    • First step: ABCs (Airway, Ventilation, Resuscitation). Do not catheterize if patient cannot pass urine; do retrograde urethrography.
    • Undisplaced: Bed rest with LL skin traction (4 weeks).
    • Anterior disruption without SI displacement: Open book < 2cm → Hammock traction. > 2cm → External fixator.
    • Displaced with SIJ disruption: Anterior Ex-Fix + Posterior screws, OR Anterior plating + Posterior screws.
Fractures of the Acetabulum, Sacrum & Coccyx
  • Acetabulum Injury Mechanism: Femoral head acts as a hammer. "Dashboard injury".
    • Externally rotated hip → Anterior column.
    • Internally rotated hip → Posterior column.
    • Abducted hip → Low transverse. Adducted hip → High transverse.
  • Types: Wall fracture, Anterior column, Posterior column (usually associated with posterior hip dislocation + sciatic nerve injury), Transverse, Complex (T-fracture).
  • Treatment of Acetabulum: Initial traction (10kg). Conservative (traction 6-8 weeks) if undisplaced/roof not involved. Operative if unstable, ball/socket incongruence, retained fragments.
  • Complications: Sciatic nerve injury, Avascular Necrosis (needs arthroplasty), Heterotopic ossification (needs Indomethacin), OA.
  • Sacrum/Coccyx: Fall onto buttock. Persistent pain on sitting. Treat with rubber ring cushion. Excision of coccyx if pain refractory.
💡 Golden Hints (ملاحظات ذهبية)

1. Urethral Injury Trap: If a patient with a pelvic fracture cannot pass urine, DO NOT catheterize. Perform retrograde urethrography first.

2. Open Book vs. Lateral Compression: Open book (AP compression) involves pubic symphysis separation. Lateral compression involves pubic rami fractures.

3. Acetabular Fracture Mechanism: A dashboard injury with an externally rotated hip hits the anterior column, while an internally rotated hip hits the posterior column.

2. Hip Dislocations & Femur Fractures

Dislocations of the Hip Joint
  • Posterior Dislocation (80%): Dashboard injury.
    • Clinical: Leg is short, adducted, internally rotated, slightly flexed.
    • Treatment (Emergency): Closed reduction via Allis method, Bigelow, or Stimson. Traction for 2 weeks.
    • Complications: Sciatic nerve injury (10-20%, foot drop), Avascular Necrosis (AVN) (Risk jumps from 10% to 40% if reduction delayed > a few hours), Myositis ossificans, OA.
  • Anterior Dislocation: Leg lies externally rotated, abducted, slightly flexed. Anterior bulge in groin. Broken Shenton's line.
  • Central Dislocation: Femoral head pushed medially through acetabulum floor (Complex acetabular fracture). Leg is short, normal position. Treat with longitudinal + lateral skeletal traction.
Femoral Neck Fractures
  • Mechanism & Clinical: Common in elderly/osteoporotic (postmenopausal women). Limb is short & externally rotated.
  • Garden's Classification:
    • GI: Incomplete impacted (valgus). Good prognosis.
    • GII: Complete undisplaced. Good prognosis.
    • GIII: Complete, partial displacement (varus). Poor prognosis.
    • GIV: Complete, full displacement. Poor prognosis.
  • Treatment: Always operative to allow early activity.
    • Internal Fixation: 2-3 cannulated screws or DHS. (Aims: Accurate reduction, Secure fixation, Early activity).
    • Prosthetic Replacement (Partial/Total): For elderly (>60), frail, failure of closed reduction, pathological fracture, or late complications (AVN/Non-union).
  • Complications: Avascular Necrosis (30% of displaced), Non-union (30%) due to flimsy periosteum, synovial fluid washing out hematoma, poor blood supply.
Trochanteric & Femoral Shaft Fractures
  • Intertrochanteric: Extra-capsular. Unites easily, seldom causes AVN. Leg is short & externally rotated. Treat with ORIF (DHS) to avoid recumbency complications.
  • Subtrochanteric: Below lesser trochanter. Proximal end is abducted & externally rotated by gluteal muscles, flexed by psoas. Treatment: ORIF (DHS, Angled plate, Interlocking nail).
  • Femoral Shaft (Winquist Classification):
    • Type 0 (No comminution), I (Insignificant butterfly), II (Large butterfly < 50%), III (Large butterfly > 50%), IV (Segmental).
    • Complications: Shock, Fat Embolism, Delayed/Non-union, Joint stiffness.
    • Treatment (Adults): ORIF (Intramedullary nail is most widely used). Conservative only if surgery contraindicated.
    • Treatment (Children): Almost always conservative. Gallows traction (< 4 yrs, < 12 kg). Accept up to 1-2cm shortening. Overgrowth common due to hyperemia.
  • Distal Femur (Supracondylar/Condylar): Distal fragment displaced by gastrocnemius → endangers popliteal circulation. Treat with ORIF (DCS, blade-plate) in adults.
💡 Golden Hints (ملاحظات ذهبية)

1. Limb Position in Hip Dislocation: Posterior dislocation = Short, Internally Rotated, Adducted. Anterior dislocation = Short, Externally Rotated, Abducted.

2. AVN Risk in Femoral Neck Fractures: Garden III & IV fractures have a high risk of AVN (30%) and Non-union (30%). In patients > 60 years, Total or Partial Hip Replacement is preferred over fixation.

3. Hip Dislocation Emergency: Posterior hip dislocation must be reduced as early as possible. If reduction is delayed beyond a few hours, the risk of AVN jumps from 10% to over 40%.

3. Pediatric Hip Disorders

Developmental Dysplasia of the Hip (DDH)
  • Epidemiology & Risk Factors: Females > Males (7:1). Left hip more common. Risk factors: Family history, Breech position, firstborn, swaddling (hips/knees extended).
  • Neonatal Diagnosis:
    • Ortolani's test: Tests for a dislocated hip. Abduct hip + upward force → "Clunk" of entry as it reduces.
    • Barlow's test: Tests for an unstable/dislocatable hip. Adduct hip + downward force → Lever the head out.
  • Late Features: Limp, asymmetric skin creases, limited abduction, positive Galeazzi sign (inequality in knee height).
  • X-Ray Lines: Broken Shenton's line. Head lies in upper lateral quadrant formed by Perkin's (vertical) and Hilgenreiner's (horizontal) lines. Acetabular roof angle > 30°.
  • Treatment by Age:
    • < 6 months: Abduction splint (Pavlik harness/Von Rosen) for 3-6 months.
    • 6 months - 6 years: Gradual closed reduction (traction → spica cast). If fails → Open reduction +/- femoral/pelvic osteotomy (Salter).
    • > 6 years: Unilateral (Open reduction + osteotomies). Bilateral (Avoid surgery unless severe pain).
Legg-Calve-Perthes Disease (LCPD)
  • Definition: Avascular necrosis of the femoral head in childhood (4-8 yrs). Boys > Girls (4:1).
  • Stages: 1. Bone death. 2. Revascularization/repair (Crescent sign on X-ray, fragmentation). 3. Distortion/remodeling (Coxa plana/magna).
  • Classification: Herring Lateral Pillar (A, B, C) and Catterall (I-IV).
  • Prognosis & Treatment:
    • Favorable signs: Age < 6, partial involvement, normal shape. Treatment: 'Supervised neglect'.
    • Unfavorable signs: Age > 6, whole head involved, lateral displacement. Treatment: Containment (keeping head seated in acetabulum) via abduction splint or surgery (Varus osteotomy of femur / Innominate osteotomy of pelvis).
Slipped Upper Femoral Epiphysis (SUFE) & Irritable Hip
  • SUFE Definition: Separation/slip of the proximal femoral epiphysis. Common in adolescents during pubertal growth spurt. Often in obese or very tall/thin kids.
  • Clinical & X-Ray: Groin/knee referred pain. Leg externally rotated, short. Limited abduction & internal rotation. X-Ray shows Trethowan's sign (line along superior neck does not pass through head).
  • Treatment: Manipulation is dangerous! Fix the epiphysis in-situ with pins/screws.
  • Complications: Avascular Necrosis (most serious), Coxa vara, Slipping of opposite hip (33%).
  • Irritable Hip (Toxic Synovitis): Common (4-10 yrs). Hip pain/limp following viral infection. Treat with rest; pain passes in 2 weeks. Must DDx from Septic arthritis/Perthes/SUFE.
💡 Golden Hints (ملاحظات ذهبية)

1. Slipped Upper Femoral Epiphysis (SUFE): Occurs during puberty (10-15 yrs), often in obese boys. Manipulation is dangerous and carries a high risk of AVN. Fix the epiphysis in-situ.

2. Ortolani vs. Barlow: Ortolani is a maneuver to *reduce* a dislocated hip (listen for the clunk). Barlow is a maneuver to *dislocate* an unstable hip.

3. Trethowan's Sign: Pathognomonic for SUFE. A line drawn along the superior surface of the femoral neck on AP X-ray does not pass through the femoral head.

4. The Knee

Anatomy, Examination & Deformities
  • Anatomy: Cruciate ligaments (ACL prevents forward tibial displacement; PCL prevents backward). Menisci (shock absorbers, increase stability, distribute load).
  • Special Tests:
    • Anterior/Posterior Drawer & Lachman: Cruciate ligaments (ACL/PCL).
    • Valgus/Varus Stress: Collateral ligaments (MCL/LCL).
    • McMurray & Apley's Compression: Meniscal injury.
    • Apley's Distraction: Ligament injury.
    • Apprehension: Patella subluxation.
  • Deformities:
    • Genu Varum (Bowlegs) & Genu Valgum (Knock-Knees): Usually correct spontaneously by age 10-12. If severe/persistent → Epiphyseodesis or osteotomy.
    • Blount's Disease (Tibia Vara): Abnormal growth of posteromedial proximal tibia. "Bird peak sign". Metaphyseal-diaphyseal angle < 11°. Needs corrective osteotomy.
Meniscal Tears
  • Medial meniscus torn 3x more than lateral (less mobile).
  • Types:
    • Traumatic (Young sports injuries, associated with ACL).
    • Degenerative (Older patients, insidious).
    • Patterns: Horizontal, Radial, Longitudinal (Bucket-handle → causes 'locking' - block to extension).
  • Vascularity: Outer third is vascular ("red zone") and can repair. Inner part is avascular ("white zone"). Total meniscectomy highly increases OA risk.
  • Treatment: Unlock joint (gentle flexion/rotation). Conservative (rest, POP slab). Operative (Arthroscopy for peripheral repair or partial meniscectomy for recurrent/locked).
Patellar Disorders
  • Recurrent Dislocation: Due to ligament laxity, flat intercondylar groove, valgus knee. Usually dislocates laterally. Positive Apprehension test. Treatment: Strengthen vastus medialis, lateral release, medial reefing.
  • Chondromalacia Patellae (Patellofemoral Overload): Softening/fibrillation of patellar cartilage. Common in teenage girls. Pain on stairs/standing up ("Movie sign"). Positive patellar grinding test. Treatment: Physiotherapy (Vastus medialis), NSAIDs, Arthroscopic shaving.
  • Osgood-Schlatter's Disease: Traction injury of the tibial apophysis (insertion of patellar ligament) in active adolescents. Prominent, tender tibial tuberosity. Self-limiting. Treat with restriction of sports, ice, patellar strap, POP cast.
💡 Golden Hints (ملاحظات ذهبية)

1. Knee Locking: The sudden inability to fully extend the knee often indicates a Bucket-Handle tear of the meniscus.

2. Meniscectomy Risk: A total meniscectomy doubles the statistical risk of developing Osteoarthritis (from 3-4% to 6-8%). Try to repair "red zone" tears.

3. Osgood-Schlatter's Disease: Is not a true osteochondritis, but rather a traction injury of the tibial apophysis in active adolescents. It is self-limiting.

5. Injuries of Knee & Leg

Acute Ligamentous Injuries & Dislocation
  • Mechanisms: Direct thrust (ACL/PCL), Varus/Valgus (LCL/MCL). Most common is external rotation (twisting) on flexed loaded knee → Medial capsule tear → MCL tear → ACL tear. Often associated with medial meniscus tear.
  • Partial vs Complete Tear: Partial gives severe pain but stable. Complete gives little pain with great instability.
  • Treatment:
    • Partial: Splint, ice, physio.
    • Complete: Surgical repair for MCL/LCL. ACL needs reconstruction (e.g., using semitendinosus), direct suture is not useful.
  • Knee Dislocation: Severe trauma. Often tears ACL + collaterals. Neurovascular emergency (check distal pulses). Urgent MUA to relocate, followed by surgical repair.
Patella Fractures
  • Mechanisms: Direct trauma (undisplaced/comminuted) or Indirect (avulsion by sudden quad contraction → transverse displaced fracture with ruptured expansion).
  • Diagnosis: Evaluate extensor mechanism (ability to extend against gravity). Check sunrise view X-ray. Normal patella:patellar tendon ratio is 1:1 (Insall method). DDx: Bipartite patella (bilateral, supero-lateral angle, smooth edges).
  • Treatment:
    • Undisplaced/Minimal (< 2mm step off) + intact extensor: POP cylinder cast.
    • Transverse displaced: ORIF (Tension Band Wiring).
    • Comminuted: < 40 yrs (POP cylinder). > 40 yrs (Patellectomy + suture extensor expansion).
Tibial Plateau & Shaft Fractures
  • Tibial Plateau (Schatzker Classification): Valgus/Varus + axial compression ("Bumper injury").
    • Type I (Lateral split), II (Lateral split+depressed), III (Lateral depressed), IV (Medial), V (Bicondylar), VI (Bicondylar with shaft dissociation).
    • Treatment: Displaced/Unstable (Gap > 5mm) → ORIF. Undisplaced → Skeletal traction, cast-bracing.
  • Tibial Spine Fracture: Avulsion of ACL. Treat with MUA + POP extension, or Arthrotomy + ORIF if reduction fails.
  • Tibia & Fibula Shaft:
    • High risk of skin loss (open fracture) and Compartment Syndrome.
    • Treatment Priorities: Preserve skin, prevent compartment syndrome (Fasciotomy), align, early weight bearing.
    • Open fractures require Ex-Fix. Closed aligned → POP cast. Unaligned/Unstable → Intramedullary nail.
💡 Golden Hints (ملاحظات ذهبية)

1. Knee Dislocation is an Emergency: It frequently tears the ACL, PCL, and collaterals, but the immediate threat is Neurovascular injury. Always check distal pulses and reduce immediately.

2. ACL Repair: Direct suturing of a torn ACL is useless. It almost always requires reconstruction using nearby structures like the semitendinosus tendon or fascia lata.

3. Compartment Syndrome Risk: Tibia & fibula shaft fractures carry one of the highest risks for compartment syndrome in orthopedics. Vigilance and early fasciotomy are life- and limb-saving.

6. The Ankle & Foot

Functional Anatomy & Assessment
  • Anatomy: Ankle is a hinge joint (mortise and tenon).
    • Medial ligament: Deltoid ligament (very strong).
    • Lateral ligament complex: Anterior talofibular (ATFL), Calcaneofibular (CFL), Posterior talofibular (PTFL).
    • Syndesmosis: Holds distal tibia and fibula together.
  • Clinical Assessment (Special Tests):
    • Anterior Drawer Test: Assesses ATFL laxity/sprain.
    • Talar Tilt Test: Inversion tests CFL. Eversion tests Deltoid ligament.
    • Thompson (Simmonds) Test: Squeeze calf. No plantar flexion indicates Achilles tendon rupture.
Congenital Deformities (Clubfoot & CVT)
  • Congenital Talipes Equinovarus (Clubfoot):
    • Deformity: Heel in equinus (down), hindfoot in varus (inward), forefoot adducted/supinated. Resembles a golf club.
    • Males > Females (2:1). Associated with spina bifida, arthrogryposis.
    • Treatment: Must begin early. Ponseti Method (repeated manipulation + POP cast weekly). Surgery for resistant cases (release tethers, lengthen tendons) followed by Dennis Browne shoes.
  • Infantile Flat-Foot (Congenital Vertical Talus):
    • Deformity: Foot turned outwards (valgus), medial arch curves opposite way creating a 'Rocker-bottom' foot.
    • X-Ray: Calcaneum in equinus, Talus points vertically into sole, Navicular dislocated dorsally.
    • Treatment: Operative correction, ideally before 2 years of age.
💡 Golden Hints (ملاحظات ذهبية)

1. Thompson Test: The lack of plantar flexion when squeezing the calf indicates a ruptured Achilles tendon.

2. Anatomy of CTEV: Remember the components of Clubfoot: Heel Equinus + Hindfoot Varus + Forefoot Adducted & Supinated.

3. Ponseti Method: The gold standard conservative treatment for Clubfoot. It relies on repeated manipulation and serial casting starting early after birth.

7. Injuries of Ankle & Foot

Ankle Sprains & Fractures
  • Ligamentous Injury (Sprain): Usually partial tear of LCL (inversion). Complete tear shows > 10° excessive inversion on stress X-ray.
    • Treatment: Partial (RICE, POP). Complete (Surgical repair for athletes, otherwise POP boot 10 weeks).
    • Recurrent Subluxation: Caused by undiagnosed complete tears. Needs lateral reconstruction (using peroneus brevis).
  • Ankle Fractures (Pott's Fracture): Twisting force.
    • Danis-Weber Classification:
      • Type A: Fibula fracture below syndesmosis (Adduction force). Usually stable.
      • Type B: Fibula fracture at level of syndesmosis (External rotation force). Stable or Unstable.
      • Type C: Fibula fracture above syndesmosis (Abduction force). Unstable (Syndesmosis torn).
    • Treatment: Accurate anatomical reduction is critical (intra-articular). Type A/Stable Type B → Cast 6-8 weeks. Type C/Unstable Type B → ORIF.
Tarsal & Metatarsal Fractures
  • Talus Fractures (Hawkin's Classification):
    • Neck forced against tibia (hyperextension). High risk of Avascular Necrosis (AVN) of the body (depends on displacement).
    • Type I (undisplaced, 10% AVN), Type II (subtalar dislocated, 30-40% AVN), Type III (subtalar + tibiotalar dislocated, >90% AVN), Type IV (+ talonavicular).
    • Treatment: Type I (POP cast), Displaced (Urgent closed reduction or ORIF).
  • Calcaneum Fractures (Palmer's Classification):
    • Most common tarsal fracture. Usually Fall from Height (FFH). 20% associated with spine/pelvis fractures.
    • Extra-articular (25%): Treat conservatively (RICE).
    • Intra-articular (75%): Involves subtalar joint. Treated with ORIF. Complications include compartment syndrome, broad heel (shoe fitting issue), subtalar stiffness/OA.
  • Metatarsal Fractures:
    • Direct blow or twisting. Treat with walking plaster 3 weeks.
    • March Fracture (Stress Fracture): Young adults (soldiers/nurses). Painful lump distal to mid-shaft (usually 2nd/3rd MT). X-ray initially normal, later shows callus. Do not mistake for Osteosarcoma! No reduction needed; support and encourage walking.
  • Toe Fractures: Tape to neighboring toe. Splint/strapping for 2-3 weeks.
💡 Golden Hints (ملاحظات ذهبية)

1. March Fracture vs. Osteosarcoma: A stress fracture of the 2nd/3rd metatarsal initially has a normal X-ray, then develops callus which can be mistaken for Osteosarcoma. No reduction is needed!

2. Talus Fractures & AVN: Blood supply is poor. Hawkin's Type III (Subtalar + tibiotalar dislocation) carries a >90% risk of AVN.

3. Pott's Fracture Key: Danis-Weber classification depends completely on the relation of the fibular fracture to the Syndesmosis (Below, At, or Above).

8. High-Yield Comparisons (المقارنات الامتحانية)

مجموعة من أهم المقارنات السريعة والشاملة والتي تتكرر باستمرار في أسئلة الامتحان.

1. Ortolani's Test vs. Barlow's Test (DDH)
Feature Ortolani's Test Barlow's Test
Purpose Tests for a Dislocated hip. Tests for a Dislocatable / Unstable hip.
Maneuver Hips flexed to 90° + Abducted with upward force. Hips flexed to 90° + Adducted with downward force.
Positive Sign A soft 'Clunk' (Jerk of entry) as the hip reduces back into the acetabulum. Levering the femoral head out of the acetabulum.
2. Club-foot (CTEV) vs. Congenital Vertical Talus (CVT)
Feature Congenital Talipes Equinovarus (CTEV) Congenital Vertical Talus (CVT)
Appearance Resembles a Golf Club. Resembles a Rocker-Bottom foot.
Hindfoot Heel in Equinus + Hindfoot in Varus. Calcaneum in equinus + Foot turned outwards (Valgus).
Mid/Forefoot Adducted & Supinated (twisted medially). Medial arch curves the opposite way.
Treatment Mostly conservative (Ponseti Method). Operative correction is the only effective treatment.
3. DDH vs. LCPD vs. SUFE
Feature DDH (Dysplasia) LCPD (Perthes) SUFE (Slipped Epiphysis)
Age Group Newborns / Infants Children (4 - 8 years) Adolescents (10 - 15 years)
Typical Patient Female > Male (7:1), Breech Male > Female (4:1), Short Obese or very tall/thin boys
Pathology Shallow acetabulum, dislocation Avascular Necrosis of head Slip through growth plate
Key Signs / X-ray Ortolani+, Broken Shenton's Dense/fragmented epiphysis Trethowan's sign
Clinical Warning Asymmetric skin creases Delay in skeletal maturity Manipulation is dangerous!
4. Genu Varum vs. Genu Valgum
Feature Genu Varum (Bowlegs) Genu Valgum (Knock-Knees)
Deformity Direction Knees pointing Outwards Knees pointing Inwards
Measurement Distance between knees > 6 cm (with medial malleoli touching). Distance between medial malleoli > 8 cm (with knees touching).
Pathological Example Blount's Disease (Tibia Vara) Generalized laxity / Rickets
5. Bipartite Patella vs. Patella Fractures
Feature Bipartite Patella Patella Fracture
Cause Congenital (failure of fusion) Traumatic (Direct or indirect)
Symmetry Usually Bilateral Usually Unilateral
Radiological Edges Flat, Smooth, Thick, Sclerotic Sharp, Irregular, Uncorticated
Typical Location Supero-lateral angle Transverse (middle) or Comminuted
6. Anterior vs. Posterior Hip Dislocation
Feature Posterior Hip Dislocation (80%) Anterior Hip Dislocation
Mechanism Dashboard injury (knee flexed) Forced abduction and external rotation
Clinical Position Short, Adducted, Internally Rotated Short, Abducted, Externally Rotated
Special Sign Nerve deficit (Sciatic N. - Foot drop) Anterior bulge in the groin