Orthopedic Assessment for Medical Students

Mastering the musculoskeletal (MSK) examination is a cornerstone of clinical medicine. Whether you are in the emergency department, a primary care clinic, or on a surgical rotation, you will encounter patients with orthopedic complaints daily. A systematic approach not only helps diagnose common injuries and degenerative conditions but is also critical for identifying limb-threatening emergencies.

The Foundational Framework: History and Physical Exam

All effective orthopedic assessment begins with a structured history and physical. The history should pinpoint the mechanism of injury (e.g., fall, twist, direct blow), the quality and location of pain, and any associated symptoms like instability, locking, or giving way. For chronic issues, inquire about the progression of symptoms and aggravating/alleviating factors.

The physical exam is methodical and follows the classic sequence: Inspection, Palpation, Range of Motion (ROM), and Special Tests. Begin by inspecting for deformity, swelling, ecchymosis, or skin changes. Palpate meticulously to locate the exact point of maximal tenderness; this often correlates with the site of pathology. Assess both active (patient moves the joint) and passive (you move the joint) range of motion, noting any pain, crepitus, or limitation. Finally, apply special tests—provocative maneuvers designed to stress specific anatomical structures. For example, the Lachman test assesses the anterior cruciate ligament (ACL), while the Neer test impinges the rotator cuff. Memorizing a few key special tests for major joints (shoulder, knee, hip) is a high-yield endeavor.

Common Fracture Patterns and Joint Pathology

Understanding common injury patterns allows for efficient diagnosis. Fractures are described by their location, displacement, angulation, and whether they are open (compound) or closed. Key patterns include:

• Transverse fractures: Often from a direct bending force.
• Oblique/Spiral fractures: Typically result from a twisting mechanism.
• Comminuted fractures: Involve multiple bone fragments, often from high-energy trauma.
• Colles' fracture: A distal radius fracture with dorsal angulation, classic for a fall onto an outstretched hand (FOOSH injury).

For joints, you must distinguish between acute injuries and chronic degeneration. Common pathologies include:

• Rotator Cuff Tears: Cause shoulder pain and weakness, especially with overhead activities.
• Meniscal Tears: Often present with knee pain, effusion, and mechanical symptoms like locking or catching.
• Osteoarthritis (OA): The most common joint pathology, characterized by progressive cartilage loss, leading to pain, stiffness, and bony enlargement (e.g., Heberden's nodes in the hands).
• Rheumatoid Arthritis (RA): A systemic autoimmune disease causing symmetric synovitis, often in the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints.

Sports medicine basics focus on the prevention, diagnosis, and management of injuries related to physical activity. Common sports-related issues include stress fractures, tendonopathies, and ligament sprains, which require specific assessment techniques and rehabilitation protocols to ensure optimal recovery and return to sport.

Radiographic Interpretation: The First-Line Tool

Plain film radiography (X-ray) is the initial imaging study for most bony injuries. Your systematic approach should be: "ABCs."

• A - Alignment: Check the anatomical alignment of bones at joints. Look for subluxation or dislocation.
• B - Bone: Inspect the entire cortex of each bone for breaks, lucencies (dark lines), or sclerotic areas (white patches).
• C - Cartilage (joint space): Assess the width of the joint space. Narrowing suggests cartilage loss (OA), while widening may indicate an effusion or ligamentous injury.
• S - Soft tissues: Look for swelling, foreign bodies, or joint effusions, which can be the only sign of a subtle fracture (e.g., a fat-fluid level in the knee suggests a tibial plateau fracture).

Always obtain at least two views (typically anteroposterior and lateral) to fully visualize a bone. For certain injuries, special views are needed (e.g., mortise view for ankle fractures).

Orthopedic Emergencies You Must Not Miss

Several conditions require immediate recognition and intervention to prevent permanent disability.

• Compartment Syndrome: Increased pressure within a fascial compartment compromises circulation and nerve function. This is a clinical diagnosis: remember the 5 P's (Pain out of proportion, Pain with passive stretch, Paresthesia, Pallor, Pulselessness is a late sign). This is a surgical emergency requiring fasciotomy.
• Open Fracture: A fracture where the bone communicates with the outside environment through a skin wound. This demands urgent irrigation, debridement, and antibiotics to prevent osteomyelitis.
• Neurovascular Injury: Always document neurovascular status distal to any injury. A pulseless, cool, pale limb indicates vascular compromise, which is an immediate surgical emergency. Nerve injuries (e.g., foot drop from peroneal nerve injury) must be identified early.
• Septic Arthritis: An infected joint presents as a hot, swollen, exquisitely tender joint with painful, limited range of motion. Patients are often febrile. This requires emergent joint aspiration and intravenous antibiotics to preserve joint function.
• Spinal Cord Injury and Cauda Equina Syndrome: Any trauma patient requires spinal immobilization until injury is ruled out. Cauda equina syndrome, often from a massive central disc herniation, presents with bilateral leg weakness, saddle anesthesia, and bladder/bowel dysfunction (urinary retention or incontinence). This is a neurosurgical emergency.

Rehabilitation and Referral Principles

Your role extends beyond diagnosis. Initial management often follows the RICE principle (Rest, Ice, Compression, Elevation) for acute soft-tissue injuries. Know when to immobilize (splint, sling) and when to encourage early motion to prevent stiffness. Understand basic rehabilitation goals: restoring range of motion, then strength, and finally functional/sport-specific training.

A key skill is knowing when to refer to an orthopedic surgeon. General indications include: all orthopedic emergencies, displaced or intra-articular fractures, injuries with neurovascular compromise, suspected septic arthritis, and mechanical joint derangements (like ACL tears) in active patients. For chronic conditions like OA, you should be comfortable initiating first-line conservative management with analgesics, physical therapy referrals, and lifestyle advice.

Common Pitfalls

1. Skipping the Neurovascular Exam: This is the most critical and frequently omitted step. Before and after any manipulation or splinting, you must check and document pulses, capillary refill, sensation, and motor function.
2. Over-Reliance on Imaging: The history and physical exam guide your decision to image. Ordering unnecessary X-rays is poor resource use and exposes patients to radiation. Use clinical decision rules (like the Ottawa Ankle Rules) when appropriate.
3. Missing the Referred Pain: Shoulder pain can originate from the neck (cervical radiculopathy) or diaphragm (referred from gallbladder pathology). Hip pathology often presents as knee pain. Always examine the joint above and below the site of complaint.
4. Improper Splinting: A splint that is too tight can cause compartment syndrome. One that is too loose is ineffective. Always splint in the position of function, pad bony prominences, and leave fingertips or toes exposed to monitor neurovascular status.

Summary

• The musculoskeletal exam is systematic: Inspect, Palpate, Range of Motion, Special Tests.
• Read X-rays methodically using the ABCs (Alignment, Bone, Cartilage, Soft tissues) and always get at least two views.
• Never miss the "can't-miss" emergencies: Compartment Syndrome, Open Fractures, Neurovascular Injury, Septic Arthritis, and Cauda Equina Syndrome.
• Always perform and document a neurovascular exam before and after any intervention.
• Understand common fracture patterns (e.g., Colles' from FOOSH) and joint pathologies (OA vs. RA, rotator cuff vs. labral tears).
• Know the principles of initial management (RICE, immobilization) and clear indications for referral to orthopedic surgery.