Differentiating Specific Pathologies

1. Bursal Pathology

Subjective:

• Localized pain, often described as aching.

• May have a history of overuse or direct trauma.

• Pain often worse with sustained pressure or specific movements that compress the bursa.

• Night pain can be significant, especially when lying on the affected side.

Objective:

• Observation: May show localized swelling, redness, or warmth if superficial (e.g., olecranon bursitis).

• AROM: Painful in movements that compress or stretch the bursa.

• PROM: Painful in the same directions as AROM, often with an empty end-feel if acutely inflamed (due to pain limiting movement before mechanical resistance) or a boggy/soft end-feel if significant effusion.

• Resisted Isometrics: Typically strong and painless. However, a key differentiator for bursitis is that resisted movements may become painful if the muscle contraction causes compression of the inflamed bursa. For example, in subacromial bursitis, resisted abduction might be painful due to the supraspinatus compressing the bursa. This pain often reduces or disappears if the resisted test is performed in a position that de-compresses the bursa (e.g., resisted abduction in supine for shoulder bursitis).

• Palpation: Exquisite, localized tenderness directly over the bursa.

2. Tendon Pathology (Tendinopathy/Tendinitis)

Subjective:

• Localized pain, often described as a dull ache or burning.

• History of repetitive overuse, sudden increase in activity, or direct strain.

• Pain is typically worse with activity involving the affected tendon, especially resisted movements.

• May have morning stiffness or pain after rest.

Objective (Cyriax Findings):

• Observation: May show localized swelling or thickening of the tendon.

• AROM: Painful when the muscle contracts, especially against resistance. Pain may also occur at end-range passive stretch of the muscle/tendon.

• PROM: Typically full and pain-free, unless the tendon is severely inflamed and stretched to its end-range, or if there's significant adhesion. No capsular pattern.

• Resisted Isometrics: The hallmark sign:

• Strong & Painful: Minor lesion (e.g., tendinopathy).

• Weak & Painful: More significant lesion (e.g., partial tear).

• Weak & Painless: Complete rupture.

• Palpation: Localized tenderness directly over the affected tendon, often at its musculotendinous junction or bony insertion (tenoperiosteal lesion).

3. Muscle Pathology (Strain/Tear)

Subjective:

• Pain localized to the muscle belly.

• Often a history of sudden, forceful contraction or overstretching.

• Sharp, acute pain at the time of injury, followed by a dull ache.

• Pain worse with muscle contraction or stretching.

Objective (Cyriax Findings):

• Observation: May show swelling, bruising (ecchymosis), or a palpable defect in more severe tears.

• AROM: Painful when the muscle contracts, especially against resistance.

• PROM: Painful when the muscle is passively stretched to its end-range.

• Resisted Isometrics:

• Strong & Painful: Minor strain (Grade 1).

• Weak & Painful: Moderate strain (Grade 2).

• Weak & Painless: Complete rupture (Grade 3).

• Palpation: Localized tenderness directly over the muscle belly, possibly a palpable defect or spasm.

4. Bone Pathology (Fracture, Osteoarthritis, Bone Tumor, Stress Fracture)

Subjective:

• Fracture: Acute, severe, localized pain, often following trauma. Inability to bear weight or move.

• Osteoarthritis: Deep, aching joint pain, worse with activity and relieved by rest. Morning stiffness.

• Bone Tumor/Infection: Constant, deep, boring pain, often worse at night and not relieved by rest or position changes. May have systemic symptoms (fever, weight loss).

• Stress Fracture: Insidious onset of localized pain, worse with activity, relieved by rest, but recurs with activity.

Objective (Cyriax Findings):

• Observation: May show deformity, swelling, or bruising (fracture). No specific findings for early osteoarthritis or bone tumors.

• AROM: Painful and limited in all directions, regardless of whether it's active or passive, or which muscle is contracting.

• PROM: Painful and limited in all directions.

• End-Feel: Often a hard (bony) end-feel where none is expected (e.g., osteophytes in OA), or a spasm end-feel due to protective guarding, or an empty end-feel if severe pain prevents reaching end-range.

• Capsular Pattern: If the joint capsule is globally affected (e.g., in osteoarthritis), the PROM will follow the specific capsular pattern for that joint.

• Resisted Isometrics: Typically strong and painless, as muscle contraction does not directly stress the bone. However, if the bone pathology is severe (e.g., fracture, aggressive tumor), resisted movements may be weak due to pain inhibition, or painful due to direct stress on the bone.

• Palpation: Diffuse tenderness over the bone, or very localized, sharp tenderness over a fracture site.

• Key Differentiator: Pain with all movements (AROM, PROM, resisted) in all directions, often with a capsular pattern or a very hard/empty end-feel, strongly points to bone or joint pathology.

By systematically applying these principles of selective tissue tension, a skilled clinician can effectively differentiate between these various orthopedic pathologies, leading to a precise diagnosis and the most appropriate management plan. This methodical approach is a cornerstone of orthopedic medicine.

The Orthopedic Screening Protocol

This approach prioritizes a logical progression from subjective history to targeted objective findings, aiming to differentiate between contractile structures (muscles, tendons, their attachments) and inert structures (ligaments, capsules, fascia, nerves, bursae, dura mater, bone).

I. Subjective Examination: The Foundation of Diagnosis

A thorough history is paramount, guiding the subsequent physical examination and informing our hypotheses. Key areas to cover include:

• Pain Localization and Characteristics: Precise location (can they point with one finger?), quality (sharp, dull, aching, burning), and radiation patterns.

• Symptom Behavior: Identifying aggravating and alleviating factors, diurnal variations, and the relationship between activity and pain (e.g., pain before, during, or after resistance).

• Onset and Mechanism of Injury: Acute vs. insidious onset, and specific details of any traumatic event.

• Functional Limitations: How do the symptoms impact daily activities, work, and recreation?

• Past Medical History: Relevant systemic conditions, prior injuries, surgeries, and current medications.

• Red Flags: Critical screening for serious underlying pathology (e.g., unexplained weight loss, night pain, fever, neurological deficits, bowel/bladder changes).

II. Objective Examination: Selective Tissue Tension Testing

This phase systematically applies stress to isolate the symptomatic structure.

• Observation: Initial visual assessment for asymmetry, swelling, bruising, muscle atrophy, skin changes, and resting posture.

• Active Range of Motion (AROM):

• The patient actively moves the joint through its full available range.

• We note the range, pain onset, quality of movement, and any compensatory patterns.

• Pain during AROM generally implicates contractile structures, but also provides a global view of joint function.

• Passive Range of Motion (PROM):

• The examiner passively moves the joint. This test primarily assesses inert structures.

• Range of Movement: Comparing to the unaffected side and normative values.

• Pain Response: Painful passive movement usually indicates an inert tissue lesion.

• End-Feel: This is a cornerstone of Cyriax diagnosis. It refers to the quality of resistance felt at the extreme end of the passive range.

• Normal End-Feels: Bone-to-bone (e.g., elbow extension), capsular/leathery (e.g., shoulder external rotation), soft tissue approximation (e.g., elbow or knee flexion).

• Abnormal End-Feels:

• Empty: Pain limits movement before any mechanical resistance is felt (suggests acute inflammation, severe pain, or potential non-musculoskeletal pathology).

• Spasm: Abrupt, involuntary muscle contraction blocking further movement (acute protective mechanism).

• Springy Block: Rebound sensation, often indicating internal derangement (e.g., meniscal tear).

• Boggy/Mushy: Associated with joint effusion.

• Pathological Hard/Soft: Bone-to-bone where unexpected or softer than normal, respectively.

• Capsular Pattern: Each major joint has a specific, proportional pattern of restricted passive movement when the entire joint capsule is inflamed or fibrosed (e.g., for the shoulder: external rotation > abduction > internal rotation restriction). Identifying a capsular pattern points directly to a global joint issue.

• Resisted Isometric Movements:

• The patient performs a strong, sustained muscle contraction against resistance, with the joint in a neutral or mid-range position to minimize joint stress. This test selectively assesses contractile structures.

• Interpretation based on Pain and Strength:

• Strong & Painless: Normal contractile unit.

• Strong & Painful: Minor lesion of muscle or tendon (e.g., tendinopathy, mild strain).

• Weak & Painless: Complete rupture of the muscle/tendon, or a neurological deficit (nerve paralysis).

• Weak & Painful: Significant lesion of muscle/tendon (e.g., partial tear), or pathology involving bone/joint that is pain-inhibiting, or a neurological lesion with associated pain.

• Palpation: Used to confirm the precise location of tenderness, swelling, crepitus, or tissue texture changes identified during functional testing.

• Neurological Screening: Performed when indicated by subjective history or objective findings (e.g., radiating pain, numbness, weakness). This includes:

• Dermatomes: Sensory testing (light touch, sharp/dull).

• Myotomes: Manual muscle testing of key muscle groups to assess nerve root or peripheral nerve motor function.

• Deep Tendon Reflexes (DTRs): To assess nerve root integrity.

• Special Tests: Specific orthopedic maneuvers are performed to confirm or rule out particular pathologies, often based on the initial hypotheses formed from the above tests (e.g., impingement tests for the shoulder, stress tests for ligaments).

References:

1. Magee, D. J. (2014). Orthopedic Physical Assessment (6th ed.). Saunders.

2.  Cyriax, J., & Cyriax, P. J. (1993). Textbook of Orthopaedic Medicine, Vol. 1: Diagnosis of Soft Tissue Lesions (11th ed.). Bailliere Tindall.