Sporting Elbow - Clinical Reasoning and Differential Diagnosis
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Introduction[edit | edit source]
The elbow is a complex joint and relatively unstable as a result of the osseus articulations of the joint. Ligaments are required to provide stability. This relative instability of the joint does make it vulnerable to injuries often caused by sports. Apart from the clinical history, clinical reasoning and the physical examination is essential to make a diagnosis.
Anatomy of the Elbow[edit | edit source]
The elbow joint is where the distal humerus meets the proximal radius and ulna bones. It is known as a trochleogingylomoid joint as it can flex and extend as a hinge (ginglymoid) joint as well as pivot around an axis (trochoid motion) known as pronation and supination. It is an extremely congruent and stable joint. The stability of the elbow is provided by the osseus anatomy, capsuloligamentous structure and the musculotendinous units that cross the elbow.
The humerus, radius and ulna articulate to form the 3 joints that make up the elbow. Table 1 provides an anatomical overview of the elbow. For more detailed information on the specific elbow joints read here: The Complex Anatomy of the Elbow - Joints
|Humeroulnar Joint||Radiohumeral Joint||Proximal Radioulnar Joint|
|Active range of motion norms||Flexion 140°
Extension 0 - 10°
Extension 0 - 10°
|Pronation 80 -90°
Supination 80 -90°
|Capsular pattern||Flexion and extension||Flexion and extension||Equal limitations of supination and pronation|
|Ligaments||Ulnar collateral ligament
(UCL -anterior oblique bundle; posterior oblique bundle; intermediate bundle; transverse ligament)
Lateral ulnar collateral
|Radial collateral ligament (RCL)||Annular ligament
Ligaments and Capsule
The Medial Collateral Ligament Complex (Ulnar Collateral Ligament) is the most important stabiliser of the elbow and provides valgus and posteromedial stability. It comprises an anterior and posterior bundle and a supporting transverse ligament (ligament of Cooper). The anterior band is more taught in extension and relaxes into flexion, whereas the posterior band tightens in flexion and releases in extension. Thus the anterior band is more vulnerable to valgus stress in elbow extension and posterior band of the AMCL is more vulnerable to valgus stress in elbow flexion.
The Lateral Collateral Ligament Complex (LCLC) is the primary stabiliser against varus and external rotation stresses. It is formed by the lateral ulnar collateral ligament, the radial collateral ligament and the annular ligament.
The joint capsule surrounds all 3 joints of the elbow. There is a thickening medially and laterally of the joint capsule that blend with the MCLC and LCLC respectively and this contributes to the stability of the elbow. (ref)
For more information read here: The Complex Anatomy of the Elbow - Ligaments and Capsule
|Muscle Synergy of the Elbow|
|Extension||Primary Elbow Extensors
Differential Diagnosis[edit | edit source]
Take into consideration both form (structures) and function in the differential diagnosis of the elbow.
Form[edit | edit source]
- Cervical Radiculopathy (Referred pain)
- Systemic Conditions (e.g. Rheumatoid Arthritis)
- Anterior Elbow:
- Posterior Elbow
- Radial side of elbow
- Synovial Plica
- Lateral Epicondylalgia (involvement of Extensor Carpi Radialis Brevis)
- Osteochondritis dissecans (Radio-capitellum)
- Posterolateral rotatory instability (PLRI) - Radiocarpal ligament combined with lateral ulnar collateral ligament
- Nerve entrapment: Posterior interosseus nerve (Radial tunnel syndrome)
- Ulnar side
It is evident that there is an abundance of conditions related to form that should be considered with the differential diagnosis of elbow pain. One way to sort it is to distinguish between traumatic and non-traumatic mechanisms.
Function[edit | edit source]
Often in athletes with elbow injuries it is evident that although the form/structures might be compromised, the athletes still show a high level of function in the injured area. As part of the differential diagnosis, it is key to not only identify the structures involved but also to have a clear picture of function (i.e. what the athlete can do; the pain pattern over time; traumatic vs non-traumatic injury; and urgency vs non-urgency surgical management.
Factors to consider related to function include:
- Kinetic chain
- Knowledge and understanding of the kinetic chain and how different components could be affected is important. For example, when a boxer throws a punch with his lead arm – the force is coming from the feet driving up into the hip. Approximately 50% of the force will come from the lower legs and into the trunk(30%) and into the upper limb(20%).
- Keep in mind that these percentages may be different in different athletes (i.e. wheelchair-based athletes and swimmers)
- The key consideration is to acknowledge and understand the whole body contribution in an injury, pathology or dysfunction.
- Strength Testing
- Isometric testing
- Examiner applying resistance with hand in different ranges will provide information on quality
- Isometric testing with a handheld dynamometer will provide quantitative information in different ranges
- Isokinetic testing
- Testing strength through range of motion
- Strength testing in tennis elbow
- Dorf et al. investigated the effect of elbow position on grip strength in the evaluation of lateral epicondylitis. There was no difference in grip strength in elbow flexion and extension for the healthy extremity. Grip strength was 29% stronger in elbow flexion than extension for the affected extremity. When comparing the healthy extremity with the affected extremity the affected extremity was 50% weaker in elbow extension compared to the healthy extremity. In elbow flexion the affected extremity was 31% weaker than the health extremity. This is significant especially with regards to elbow extension providing a mechanical advantage in grip strength of the hand. Using strength testing in people with tennis elbow will provide better objectivity.
- Isometric testing
- Range of motion
- Movements at the elbow to consider and measure:
- Flexion and Extension
- Pronation and Supination
- Smartphone apps are available to help clinicians measure elbow range of motion.
- Measuring flexion and extension with an inclinometer app on smartphone
- Patient rests arm flat on table to have humerus parallel to the horizontal plane, forearm in neutral. Inclinometer set to zero on table, patient flexes elbow maximally. Smartphone placed parallel to forearm and value can be read.
- For elbow extension the smartphone is aligned to the forearm in maximal extension
- Movements at the elbow to consider and measure:
Special Investigations[edit | edit source]
- Can assist in the management of stubborn cases of lateral epicondylalgia by characterising the extent of the tendon tearing and identifying the presence of concomitant RCL injury.
- Injection (Lignocaine or Marcaine)
Clinical Tests[edit | edit source]
- Lateral Epicondylalgia
- Medial Collateral Ligament Complex/Ulnar Collateral Ligament insufficiency
- Posterolateral rotatory instability
- Table-top relocation test
- Stand-up test/chair push up test
- Push-up test
- Lateral pivot shift test
- Total distal biceps rupture
- Total distal triceps rupture
- Triceps squeeze test
- Posteromedial impingement syndrome
- Arm bar test
- Valgus overload test/posteromedial impingement test
- Medial epicondylalgia
- Epicondylitis medialis test/ Golfer’s elbow test
- Polk’s test medial
Whatever clinical test is being performed, always consider the amount of stress being applied to the structure and the element of safety.
Proximal Radioulnar Joint and Humeroradial Joints in Lateral Epicondylalgia[edit | edit source]
It is important to consider the proximal radioulnar joint (PRUJ) and the humeroradial joints (HR) in relation to lateral epicondylalgia. Specifically taking into consideration the following:
- Extensor Carpi Radialis Brevis arises from the lateral epicondyle and the annular ligament
- Radial collateral ligament also originates from lateral epicondyle and inserts into the ligament
- The close relationship between ECRB and RCL is seen in:
- Concomitant injuries occurring
- Potential instability around this region may provoke lateral epicondylalgia (tennis elbow)
Therefore having a good understanding of the close relationship between ECRB and RCL as well as the mobility of the radiohumeral joint will have an impact on lateral epicondylalgia (tennis elbow) management. Furthermore, consider the open and close-packed positions of the elbow joints to avoid confusion when palpating or mobilising these joints.
|Joints||Open Packed||Close Packed|
|PRUJ||Elbow flexion (70°)
|Elbow flexion (70°)
Medial Epicondylalgia and Pronator Teres[edit | edit source]
- Hypertrophy of Pronator Teres may lead to symptoms around the medial epicondyle of the elbow.
- Pronator teres syndrome – median nerve being trapped between the two heads of pronator – this will mainly produce symptoms distally rather than locally.
Conclusion[edit | edit source]
General guidelines to consider:
- Consider traumatic vs non-traumatic injuries
- Structures (Form) involved
- Prognosis = Function
- What can or can’t the athlete do?
- Range of motion
- End feel
- With non-traumatic injuries consider contributions from the shoulder and forearm, as well as the hand and wrist.
- For Lateral Epicondylalgia and Medial Epicondylalgia – consider surrounding structures that can also be involved
- The elbow can be tricky – if insure get a second opinion!
References[edit | edit source]
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