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Orthopedics

The branch of medicine dealing with the correction of deformities of bones or muscles.

โœ“ Introduction to Orthopedics

โœ“ Introduction to Orthopedics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Bone Anatomy Basics

โœ“ Bone Anatomy Basics is an essential biology topic covering living systems, from cellular processes to ecosystems.

Key points: Structure and function, clinical presentation, diagnostic criteria, and evidence-based management.

โœ“ Joint Anatomy Basics

โœ“ Joint Anatomy Basics is an essential biology topic covering living systems, from cellular processes to ecosystems.

Key points: Structure and function, clinical presentation, diagnostic criteria, and evidence-based management.

โœ“ Fracture Basics

โœ“ Fracture Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Arthritis Basics

โœ“ Arthritis Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Sports Injuries Basics

โœ“ Sports Injuries Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Osteoporosis Basics

โœ“ Osteoporosis Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Pediatric Orthopedics Basics

โœ“ Pediatric Orthopedics Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Spine Disorders Basics

โœ“ Spine Disorders Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Hand Surgery Basics

โœ“ Hand Surgery Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Foot & Ankle Basics

โœ“ Foot & Ankle Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Joint Replacement Basics

โœ“ Joint Replacement Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Orthopedic Oncology Basics

โœ“ Orthopedic Oncology Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Orthopedic Trauma Basics

โœ“ Orthopedic Trauma Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Orthopedic Ethics Basics

โœ“ Orthopedic Ethics Basics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Orthopedics Careers

โœ“ Orthopedics Careers is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Advanced Orthopedics

โœ“ Advanced Orthopedics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Bone Anatomy

โœ“ Bone Anatomy is an essential biology topic covering living systems, from cellular processes to ecosystems.

Key points: Structure and function, clinical presentation, diagnostic criteria, and evidence-based management.

โœ“ Joint Anatomy

โœ“ Joint Anatomy is an essential biology topic covering living systems, from cellular processes to ecosystems.

Key points: Structure and function, clinical presentation, diagnostic criteria, and evidence-based management.

โœ“ Fracture

โœ“ Fracture is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Arthritis

โœ“ Arthritis is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Sports Injuries

โœ“ Sports Injuries is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Osteoporosis

โœ“ Osteoporosis is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Pediatric Orthopedics

โœ“ Pediatric Orthopedics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Spine Disorders

โœ“ Spine Disorders is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Hand Surgery

โœ“ Hand Surgery is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Foot & Ankle

โœ“ Foot & Ankle is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Joint Replacement

โœ“ Joint Replacement is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Orthopedic Oncology

โœ“ Orthopedic Oncology is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Orthopedic Trauma

โœ“ Orthopedic Trauma is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Orthopedic Ethics

โœ“ Orthopedic Ethics is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Core principles, practical applications, and advanced concepts that build deep understanding.

โœ“ Orthopedics Research

โœ“ Orthopedics Research is a clinical topic covering pathophysiology, diagnosis, evidence-based treatment, and patient care.

Key points: Time complexity (Big-O), space complexity, correctness proof, and practical implementation trade-offs.

Key Clinical Formulas & Scores

Gustilo-Anderson Open Fracture Classification:
Type I: Clean wound <1 cm, minimal soft tissue damage, low energy
Type II: Laceration >1 cm, moderate soft tissue injury, no flap/avulsion
Type IIIA: Extensive soft tissue damage but adequate coverage, high energy
IIIB: Extensive soft tissue injury with periosteal stripping, massive contamination
IIIC: Requires vascular repair (arterial injury)
Management: All types need tetanus prophylaxis, broad-spectrum antibiotics (Type I: cefazolin; Type II/III: cefazolin + gentamicin ยฑ penicillin for clostridial coverage), urgent irrigation and debridement (ideally within 6 hours)
Harris Hip Score (HHS):
Pain: 44 points (40=none, 44=slight, 20=moderate, 0=disabling)
Function: 47 points (gait limp, support, distance, stairs, shoes, sitting)
Range of motion: 5 points (flexion, abduction, adduction, external/internal rotation)
Deformity: 4 points (fixed flexion, adduction, internal rotation, leg length discrepancy)
Total: 0-100 (excellent 90-100, good 80-89, fair 70-79, poor <70)
Knee Society Score (KSS):
Knee Score (objective): 100 points โ€” pain (50), ROM (25), stability (25)
Deductions: -20 flexion contracture, -15 extension lag, -5 malalignment
Function Score: 100 points โ€” walking distance (50), stairs (50)
Deductions: -5 cane, -10 two crutches, -20 walker
Total: 0-200 | Excellent: 180-200, Good: 150-179, Fair: 100-149, Poor <100
Tscherne Classification (Soft Tissue Injury in Fractures):
Grade 0: Indirect trauma, minimal soft tissue damage
Grade 1: Superficial abrasion/contusion, indirect mechanism
Grade 2: Deep contaminated abrasion, direct trauma, incipient compartment syndrome
Grade 3: Extensive skin contusion/muscle destruction, vascular injury, compartment syndrome
Rnee Injury and Osteoarthritis Outcome Score (KOOS):
5 subscales: Pain (9 items), Symptoms (7 items), ADL (17 items), Sport/Rec (5 items), QoL (4 items)
Each scored 0-100 (0=extreme symptoms, 100=no symptoms)
Used for ligament injuries, meniscal tears, osteoarthritis, post-TKA
Minimal clinically important difference: 8-10 points

Core Concepts

Fracture Healing & Classification

Primary (direct) healing: absolute stability (compression plating), cutting cone remodeling, no callus. Secondary (indirect) healing: relative stability (IM nailing, casting), external callus formation. Phases: inflammation (hematoma, 1-2 weeks), soft callus (granulation tissue, 2-3 weeks), hard callus (woven bone, 4-16 weeks), remodeling (lamellar bone, months-years). Nonunion: no progression by 9 months, no bridging at 3 months. Risk factors: smoking, diabetes, NSAIDs, infection, poor blood supply, excessive gap, instability.

Osteoarthritis (OA)

Pathophysiology: cartilage degradation, subchondral bone sclerosis, osteophyte formation, synovitis. Knee: most common. Radiological (Kellgren-Lawrence): Grade 0=none, 1=doubtful osteophyte, 2=definite osteophyte, 3=moderate joint space narrowing, 4=severe JS subluxation. Treatment: non-pharmacologic (exercise, weight loss, PT, bracing), pharmacologic (topical NSAIDs, oral NSAIDs, intra-articular corticosteroids/hyaluronic acid), surgical (arthroscopy with limited role, osteotomy, joint replacement).

Compartment Syndrome

Pathophysiology: increased pressure within osteofascial compartment โ†’ decreased capillary perfusion โ†’ tissue ischemia. Most common: tibial fracture, crush injury, burns, tight casts. Clinical: 5 P's (Pain out of proportion, Pallor, Paresthesia, Paralysis, Pulselessness โ€” late sign). Pain with passive stretching = earliest sign. Diagnosis: intracompartmental pressure measurement (delta P = diastolic BP - compartment pressure; ฮ”P โ‰ค 30 mmHg indicates fasciotomy). Treatment: emergent fasciotomy. Complications: Volkmann ischemic contracture, rhabdomyolysis, renal failure, amputation.

Osteoporosis & Fragility Fractures

Definition: T-score โ‰ค -2.5 SD by DXA. FRAX score: 10-year probability of major osteoporotic/hip fracture. Treatment threshold: hip fracture risk โ‰ฅ3% or major osteoporotic risk โ‰ฅ20%. First-line: bisphosphonates (alendronate, risedronate, zoledronic acid). Denosumab: RANKL inhibitor for those who cannot tolerate bisphosphonates. Anabolic: teriparatide (PTH analog), abaloparatide, romosozumab for high risk. Calcium 1000-1200 mg/day, vitamin D 800-2000 IU/day.

Clinical Case Studies

Case 1: Distal Radius Fracture (Colles)

Patient: 68-year-old female, fell on outstretched hand, wrist deformity ("dinner fork"), swelling, tenderness. X-ray: dorsally angulated distal radius fracture, intra-articular involvement, 3 mm shortening.

Assessment: Intra-articular distal radius fracture (AO type 23-C2). Osteoporotic (DEXA T-score -2.8).

Management: Closed reduction and casting if acceptable alignment (radial height >10 mm, volar tilt >0ยฐ, radial inclination >15ยฐ). If unstable or unacceptable alignment โ†’ open reduction with volar locking plate (ORIF). Post-op: early range of motion, osteoporosis treatment (alendronate), fall prevention program.

Case 2: Anterior Cruciate Ligament (ACL) Tear

Patient: 22-year-old soccer player, non-contact pivot injury, "pop" sound, immediate effusion. Lachman test positive, pivot shift positive. MRI: complete ACL tear, bone bruise pattern (lateral femoral condyle + posterolateral tibia), intact menisci.

Management: ACL reconstruction using bone-patellar tendon-bone autograft (gold standard) or hamstring autograft. Rehabilitation: Phase 1 (0-2 weeks, ROM, edema control), Phase 2 (2-6 weeks, progressive strengthening), Phase 3 (3-6 months, agility/plyometrics), Phase 4 (6-9 months, sport-specific). Return to sport: โ‰ฅ9 months with functional testing (quadriceps symmetry >85%, hop tests >90%). Graft failure risk highest in first 12 months.

Case 3: Femoral Neck Fracture

Patient: 82-year-old female, fall from standing, left hip pain, inability to bear weight, leg externally rotated and shortened. X-ray: displaced femoral neck fracture (Garden Type IV).

Assessment: Displaced intracapsular fracture in elderly patient โ†’ high risk of avascular necrosis and nonunion.

Management: Hemiarthroplasty (bipolar) is the treatment of choice for displaced femoral neck fractures in elderly, low-demand patients (avoids AVN risk of internal fixation). Total hip arthroplasty may be considered for active, cognitively intact patients with pre-existing hip osteoarthritis. Post-op: weight-bearing as tolerated, DVT prophylaxis (LMWH), delirium prevention, early mobilization (within 24 hours), osteoporosis treatment, fall prevention assessment. Mortality at 1 year: 20-30%.

Practice Questions

Q1: A patient with a tibial fracture has intracompartmental pressure of 42 mmHg and diastolic BP of 75 mmHg. What is the delta-P and management?
A: ฮ”P = 75 - 42 = 33 mmHg. ฮ”P โ‰ค30 mmHg is the threshold for fasciotomy; this patient is close but above threshold. Repeat measurement; if rising or clinical signs worsen, proceed with emergent 4-compartment fasciotomy.
Q2: What is the first-line pharmacological treatment for osteoporosis in a 70-year-old woman with T-score -3.0?
A: Oral bisphosphonate (alendronate 70 mg weekly or risedronate 35 mg weekly). Ensure adequate calcium (1000-1200 mg/day) and vitamin D (800-2000 IU/day) supplementation. Zoledronic acid 5 mg IV yearly if oral intolerance.
Q3: A Gustilo-Anderson Type IIIB open tibia fracture requires what antibiotic regimen?
A: Cefazolin (2g IV q8h) + gentamicin (5 mg/kg IV daily). Add penicillin (4 million units q4h) if clostridial coverage needed (farm injuries, fecal contamination). Continue for 72 hours or until soft tissue closure, whichever is sooner.
Q4: What is the most specific clinical test for ACL tear?
A: Lachman test โ€” tibia anterior translation with firm endpoint at 20-30 degrees knee flexion. Sensitivity 85-95%, specificity 90-95%. Pivot shift is the most specific for functional instability.
Q5: A displaced femoral neck fracture in an 82-year-old patient is best managed with what procedure?
A: Hemiarthroplasty (bipolar prosthesis). Internal fixation has high failure rates (30-40%) due to AVN and nonunion risk in displaced fractures. Total hip arthroplasty for active, cognitively intact patients with pre-existing hip arthritis.

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