Triangular Fibrocartilage Complex Injuries

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Introduction

• The triangular fibrocartilage complex (TFCC) is a load-bearing structure between the lunate, triquetrum, and ulnar head.
• The function of the TFCC is to act as a stabilizer for the ulnar aspect of the wrist.
• The TFCC is at risk for either acute or chronic degenerative injury.
• Forced ulnar deviation and positive ulnar variation carry associations with injuries to the TFCC.
• Patients with TFCC injury will present with ulnar-sided wrist pain that may present with clicking or point tenderness between the pisiform and the ulnar head.
• MRI imaging is useful as a preliminary diagnostic tool; arthroscopy is the diagnostic gold standard.
• Treatment options include conservative therapies such as rest, NSAIDs, and corticosteroid injections as well as operative management.

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Clinically Relevant Anatomy

The Triangular Fibrocartilage Complex is the ligamentous and cartilaginous structures that separate the radiocarpal from the distal radioulnar joint. The TFCC consists of an articular disc, meniscus homologue, ulnocarpal ligament, dosal & volar radioulnar ligament and extensor carpi ulnaris sheath.

• Origin: Medial border of distal radius
• Insertion: Base of ulnar styloid
• Vascular Supply: central disc is avascular, peripheral blood vessels penetrate TFCC margins
• Function of TFCC: Main stabilizer of distal radioulnar joint (volar portion of TFCC prevents dorsal displacement of ulna and is tight in pronation and dorsal portion of TFCC prevents volar displacement of ulna and is tight in supination). Contributes to ulnocarpal stability

Etiology

• Occurs with compressive load on TFCC during marked ulnar deviation
• Commonly associated with positive ulnar variance (radial shortening, average of 4.5 mm)
• Forced ulnar deviance (i.e. swinging bat, racket, etc) causes increased load on TFCC 

Pathophysiology

Anatomically the TFCC includes the triangular fibrocartilage disc, extensor carpi ulnaris tendon subsheath, ulnotriquetral and ulnolunate ligaments, dorsal and volar distal radioulnar ligaments, meniscal homolog, and the ulnocarpal collateral ligament.

• The triangular fibrocartilage disc attachment on the radial side is to hyaline cartilage, which makes this weaker compared to the ulnar side’s bony attachment.
• Positive ulnar variation can leave the TFCC vulnerable to injury.
• Ulnar variation will decrease with supination and increase with pronation.
• Small changes in ulnar length have been shown to have substantial effects on the amount of load to the ulna.
• The extensor carpi ulnaris relies on the TFCC for movement, and thus alteration of the motion of the extensor carpi ulnaris may lead to abnormal force through the TFCC, predisposing it to injury

Clinical Presentation

• Patients will complain of ulnar-sided wrist pain that often gets worse with activity.
• There may also be a weakness in the grip, instability, or clicking.
• There are some elements of the history which can occur in conjunction with individual sports eg baseball-specific acute injury can be due to forced wrist extension while doing a head-first slide or when a hitter attempts to hit an inside pitch and gets “jammed.”
• Chronic injury can occur in baseball players as a result of the heavy load placed on the wrist during the swing. These athletes can sustain TFCC injuries even if they do not have positive ulnar variance

Diagnostic Procedures

Physical Examination

On exam, palpation of the TFCC is best with the wrist in pronation. It is between the flexor carpi ulnaris, ulnar styloid, and os pisiform. Several physical exam tests can suggest the diagnosis of TFCC injury. These include:

• TFCC compression test: forearm in the neutral position with ulnar deviation reproduces symptoms
• TFCC stress test: applying a force across the ulna with the wrist in ulnar deviation reproduces symptoms
• Press test: Patient lifts themselves out of a chair using the wrists in an extended position. Pain indicates a positive test.
• Supination test: Patient grabs the underside of a table with the forearms supinated; this causes a load on the TFCC and dorsal impingement, which will cause pain if there is a peripheral, dorsal tear.
• Piano key test: Place both hands on an exam table and press the palms on the table. If the distal ulna is prominent on the affected side, this suggests distal radioulnar joint instability which can have associations with TFCC injury. If the palms are relaxed and the ulnar head goes back to normal position, this is a positive test
• Grind test: Compress the radius and ulna and have the patient rotate the forearm. Pain could indicate a degenerative process

Diagnostic Imaging

• Radiographs: may reveal avulsion of ulnar styloid, scaphoid fracture, distal radial fracture, volar tilt of lunate or triquetrum; ulnar variance
• Triple Injection Arthrography: identification of tear (low specificity)
• MRI: identification of tear (high sensitivity and specificity)
• The Palmer classification is the most recognized scheme for TFCC lesions It divides them into these two categories (with subdivisions, beyond the scope of this articles) Traumatic and Degenerative .This classification provides an accurate anatomic description of tears, it does not guide treatment or indicate prognosis

Surgical treatment will depend on the Palmer classification of the injury

Palmar Classification of TFCC Abnormalities

• Class 1: Traumatic (subset exist)
• Class 2: Degenerative (subsets exist)

It is important to distinguish between class 1 and class 2, because a traumatic tear can be repaired, but a degenerative tear is often associated with ulnocarpal impaction syndrome which means that the ulnarpositive variance needs to be assessed. 

Outcome Measures

• DASH Outcome Measure
• Modified Mayo Wrist Score
• Activities of Daily Living Score

Management / Interventions

Conservative Treatment:

• The rehabilitation program should consist of rest, activity modification to remove the inciting force of injury, ice application and splint immobilisation for 3 to 6 weeks
• After the immobilisation, the patient should receive physical therapy

Surgical Intervention

Surgical options should be a consideration if conservative treatment fails or if there is DRUJ instability.

Common surgical options include arthroscopic repair, arthroscopic debridement, ulnar shortening, and the Wafer procedure.

A debridement is a surgical option that induces bleeding to stimulate healing. Debridement has beneficial outcomes for central TFCC tears but has been shown to have worse outcomes in degenerative tears or patients with higher positive ulnar variance.

Post-operative rehabilitation:

For type 1 injuries, the wrist will be immobilised for 1 week after the arthroscopy. After one week, range of motion exercises can be started.
A TFCC tear is a common injury in golf, boxing, tennis, waterskiing, gymnastics, pole vaulting and hockey.
Golf players and tennis players who suffer from a stable TFCC tear are able to start light activity ball contact at 3 weeks after the arthroscopy. They can return to their normal sports activity in 4 to 6 weeks.

When the symptoms remain, ulnocarpal corticosteroid injection can be an option. However, it is unlikely that this will heal the tear, so the symptoms will not subside. An arthroscopic debridement can be an option if the conservative measures fail.

For more severe injuries, post-operative immobilisation in a Muenster cast for 4 weeks may be considered. After 4 weeks the wrist is placed in a short arm splint or Versa wrist splint, which allows progressive motion to the wrist. The immobilisation will decrease the wrist pain and aggravation, which could improve healing. Some types of splints will help stabilise the wrist, which will lead to an improvement in hand function. Patients can then start with range of motion and grip-strengthening exercises. Therapists are more likely to give eccentric grip strengthening exercises, because this will have an influence on the co-activation pattern of the wrist-flexors, which help stabilise the wrist. Other co-activation exercises can also be included to improve the global wrist stability.

Active muscle training should be started 8 weeks post-operation. A graded pain-free exercise program is recommended. Physiotherapy management should include patient education and activity modification. Isometric exercises should be included to help strengthen the area and reduce the risk of instability. In particular, unilateral isometric exercises are beneficial as they have been found to increase voluntary muscle activation bilaterally. This may be because the motor cortex is stimulated, resulting in greater neuromuscular control. In addition, controlled isometric activation of pronator quadratus in supination and neutral wrist position will help to stabilise the distal radioulnar joint (DRUJ). This can be used pre- and postoperatively in patients with TFCC injuries.

These patients are likely to resume normal activity by 3 months postoperatively. It takes 3 to 4 months to return to normal sports activities.

Passive mobilisation

Initially, a traction of the radiocarpal and the midcarpal joints can be used to determine whether this provokes pain.

• To promote the wrist flexion, a dorsal sliding technique can be used.
• To promote the wrist extension, the volar sliding technique can be used.
• To promote the radial deviation the ulnar sliding technique can be used.
• To promote the ulnar deviation, the radial sliding technique can be used.
  
  

General mobility exercises

The patient should perform:

• Wrists rotations.
• Horizontal ulnar and radial deviation.
• Active pronation and supination.
• Stretching flexion and extension of the wrist.

Strengthening exercises

At the end of the therapy, then move on to strengthening exercises. The following exercises are all done with a weight in the hands or with a terra tire.

• Flexion and extension.
• Pronation and supination.

Differential Diagnosis

Differential diagnoses include:

• Osteoarthritis of pisotriquetral/distal radioulnar joint
• Lunotriquetral injuries
• Ulnar extensor muscle tendinitis or subluxation
• Chondral lesions of the distal radioulnar joint
• Ulnar flexor muscle tendinitis
• Pisotriquetral compression syndrome
• Ulnar carpal impingement
• Carpal/Midcarpal Instability
• Hypothenar Hammer Syndrome
  

In the case of acute injury:

• ulnar styloid base fracture
• widening of the distal radio-ulnar joint space