This document summarizes a presentation on distal tibiofibular syndesmosis injuries. It begins with an overview of syndesmosis anatomy and the mechanisms of injury. Diagnosis involves physical exams like stress tests and imaging of tibiofibular spaces. Treatment may involve conservative immobilization or surgery using techniques like syndesmotic screws or suture buttons to reduce and stabilize the injury. Precise reduction and fixation are important for proper healing.
Deformity: It’s the position of a limb/Joint, from which it cannot be brought back to its normal anatomical position.
Described as abnormalities of :
Length
Angulation
Rotation
Translation
Combination
Safe surgical dislocation for femoral head fractures.dr mohamed ashraf,dr rah...drashraf369
femoral head fractures are very complex fractures that need immediate and prompt surgical intervention.conventional surgical appproaches to hip may lead to short and long term complications.dr mohamed ashraf ,dr rahul thampi et al are presenting their experience with gantz safe surgical dislocation approach to surgical management of femoral head fractures
Deformity: It’s the position of a limb/Joint, from which it cannot be brought back to its normal anatomical position.
Described as abnormalities of :
Length
Angulation
Rotation
Translation
Combination
Safe surgical dislocation for femoral head fractures.dr mohamed ashraf,dr rah...drashraf369
femoral head fractures are very complex fractures that need immediate and prompt surgical intervention.conventional surgical appproaches to hip may lead to short and long term complications.dr mohamed ashraf ,dr rahul thampi et al are presenting their experience with gantz safe surgical dislocation approach to surgical management of femoral head fractures
In this article, we present how to evaluate syndesmosis injury by a case discussion. We also review the current concepts of syndesmosis injury in ankle fracture especially intraoperative evaluation and how to set syndesmotic screw fixation.
In this article, we present how to evaluate syndesmosis injury by a case discussion. We also review the current concepts of syndesmosis injury in ankle fracture especially intraoperative evaluation and how to set syndesmotic screw fixation.
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syndesmotic injury mechanism and treatment subject review
1. 16-11-14
Presenter - Dr. Sunil Poonia
Moderator – Dr. Vikas Agarwala
Assistant professor, Deptt. of Orthopaedics
Silchar Medical College
2. INTRODUCTION
The distal tibiofibular syndesmosis is a critical structure in
maintaining the congruency of the ankle mortise, and the
ligamentous structures account for more than 90% of the
resistance to lateral fibular displacement
5% of all ankle sprain and 23% of all ankle # are a/w
syndesmotic injury
3. Coexistence of osseous or deltoid ligament injuries
can critically destabilize the ankle.
A recent survey of orthopaedic and trauma surgeons
found disagreement with regard to the treatment of
syndesmotic injuries
5. ANATOMY
• The distal tibiofibular joint comprises the convex distal aspect of
the fibula and the concave lateral aspect of the distal end of the
tibia, and is defined as a syndesmotic articulation without
articular cartilage.
• Normal motion of the ankle requires rotation, translation, and
migration of the fibula at the syndesmosis to accommodate the
trapezoidal shape of the talus.
• The distal tibiofibular syndesmosis comprises four distinct
ligaments including the interosseous ligament, the anterior
inferior tibiofibular ligament, the posterior inferior tibiofibular
ligament, and the inferior transverse ligament
6. ANATOMY
The anterior inferior tibiofibular ligament originates from the
anterolateral tubercle of the tibia and inserts at the anterior tubercle
of the fibula.
The posterior inferior tibiofibular ligament originates from the
posterior tubercle of the tibia and inserts at the posterior edge of
the lateral malleolus.
The fibro cartilaginous inferior transverse ligament forms the distal
portion of the posterior inferior tibiofibular ligament, and is often
considered the same ligament.
13. MECHANISM
Isolated syndesmotic injuries, without bony injury, are
thought to occur mainly from forced dorsiflexion
and external rotation in combination with and
axial load
Bony injury does not always reliably reveal the
underlying ligamentous injury - stress tests including
external rotation of the foot and stressing the fibula with
a bone hook
14. DIAGNOSIS
generally present with acute ankle instability, pain,
and functional deficits.
The history should include the mechanism of injury,
previous injuries or surgical procedures, and
symptoms of instability.
15. external rotation stress test entails stabilization of the leg with the
knee in 90° of flexion, followed by external rotation of the foot
squeeze test entails compression of the proximal part of the fibula
to the tibia, separating the two bones distally
crossed-leg test entails crossing the injured leg over the uninjured
leg while the patient is seated, followed by gentle downward
pressure to the knee of the injured leg
forced dorsiflexion test entails forcing the ankle into dorsiflexion,
and then repeating this manoeuvre while compressing the distal
end of the tibia and fibula together either manually or with
athletic tape. Decreased pain with compression suggests
syndesmotic injury.
16.
17. Three radiographic parameters have been defined for the diagnosis
of syndesmotic injury.
The tibiofibular overlap should normally be >6 mm in the
anteroposterior radiograph and >1 mm in the mortise radiograph
as measured 1 cm proximal to the tibial plafond.
Tibiofibular clear space should be <6 mm in both the
anteroposterior and mortise radiographs as measured 1 cm
proximal to the tibial plafond.
Medial clear space should be less than or equal to the clear space
between the talar dome and the tibial plafond
Tibiofibular clear space is the most reliable measure because it is
not affected by the position of the leg relative to the x-ray beam
18. Gravity or external rotation stress radiographs can differentiate
between frank diastasis (evident on static radiographs) and latent
diastasis (evident only on stress radiographs).
Diastasis occurs primarily with posterior displacement of the
fibula and is best visualized in the lateral radiograph.
Comparisons with radiographs of the contralateral limb are
helpful if there is doubt about the presence of diastasis.
19. SYNDESMOTIC INJURIES WITH
ASSOCIATED MALLEOLAR
FRACTURES
One study has found that 39% of Weber type-B SER-4 ankle fractures
demonstrated syndesmotic instability
standard radiographs and biomechanical criteria are inadequate for
diagnosing syndesmotic disruptions in malleolar fractures
Diagnosis relies increasingly on intraoperative stress-testing
following malleolar fixation.
Tornetta et al. found that 45% of operatively treated SER-4-
equivalent fractures demonstrated syndesmotic instability on
intraoperative stress examination
20. Two commonly used intraoperative stress tests are the
hook test and the external rotation test under fluoroscopy.
Hook test - the surgeon pulls the lateral malleolus with a
bone hook while stabilizing the tibia. Lateral movement of
the fibula of >2 mm of indicates a positive hook test.
External rotation stress test - the tibia is stabilized while
the foot is externally rotated under fluoroscopy. Increased
medial clear space indicates a positive external rotation
stress test
21. a cadaveric study found that any lateral forces of >100 N do
not substantially increase tibiofibular clear space in
specimens with dissected syndesmotic ligaments, suggesting
that 100 N of lateral force serves as a good benchmark for a
standardized hook test. Evidence also suggests that the
accuracy of the hook test may improve by applying force in
the sagittal plane and assessing the amount of displacement
in the lateral radiograph
23. CONSERVATIVE
Most isolated syndesmotic injuries can be treated
conservatively
Williams et al. proposed a three-phase treatment plan
Phase I focuses on protecting the ankle and managing
pain and edema with immobilization, limited weight-bearing,
light ankle motion exercises, rest, ice,
compression, and elevation.
24. Phase II includes strength and proprioceptive exercises,
progressing from low-intensity exercises with high
repetitions to high-intensity exercises with low repetitions
Phase III includes rigorous strengthening exercises and
sports-specific movements.
25. OPERATIVE
Traditionally, all SER-type ankle fractures.
evidence suggests that SER-4 ankle fractures can be treated without
syndesmotic fixation.
Pakarinen et al. performed a stress test on SER-4 ankle fractures
intraoperatively following osseous fixation. If the stress test was
positive, the patient was randomized to either syndesmotic fixation
or no syndesmotic fixation. At the one-year follow-up, no significant
differences existed in functional outcomes between the groups.
26. In the past, internal fixation of all syndesmotic injuries was
considered mandatory
(1) syndesmotic injuries associated with proximal fibular
fractures for which fixation is not planned and that involve a
medial injury that cannot be stabilized and
(2) syndesmotic injuries extending more than 5 cm proximal
to the plafond.
27. REDUCTION
A cadaveric study found that variations in the angulation of
reduction clamps and subsequent syndesmotic screw
placement can cause iatrogenic syndesmotic malreduction.
Clamps placed at 15° and 30° of angulation in the axial plane
displaced the fibula in external rotation and caused over
compression of the syndesmosis.
A cadaveric study found that clamp placement in neutral
anatomical axis reduced the syndesmosis most accurately
28. Cadaveric data suggest that fixation of the fibula in as much as 30° of
external rotation may go undetected using intraoperative
fluoroscopy.
The most common malreduction was fibular malpositioning,
followed by malreductions of the fracture
it was recommended to maximally dorsiflex the ankle during
syndesmotic fixation to prevent postoperative limitation of motion;
however, there are data refuting this finding and noting that maximal
dorsiflexion may induce an external rotation moment risking
malreduction
30. SYNDESMOTIC SCREW
syndesmotic screw fixation entails the placement of
screw(s) across the syndesmosis from the lateral
aspect of the fibula into the tibia
Fixation can be achieved with single or double screws,
metal or bioabsorbable screws, 3.5-mm or 4.5-mm
screws, transsyndesmotic or suprasyndesmotic
screws, and with tricortical or quadricortical fixation
31. Double screws and 4.5-mm screws provide stronger
mechanical fixation.
Two-hole locking plates (with 3.2-mm screws) provide
greater stability to torque compared with 4.5-mm
quadricortical fixation in Maisonneuve fractures.
However, while the strength of fixation stabilizes the
joint, it eliminates normal motion between the tibia and
fibula
33. If the screw is placed too far proximally, it may deform the
fibula and cause the mortise to widen.
If the screw is not parallel to the joint, the fibula may shift
proximally.
If the screw is not perpendicular to the tibiofibular joint,
the fibula may remain laterally displaced.
The AO group recommended a fully threaded syndesmotic
screw in a neutralization mode
34. SUTURE BUTTON
Suture-button fixation represents a promising alternative.
Following reduction, a hole is drilled through the fibula
and tibia parallel to the ankle joint.
Polyester suture is then passed through and secured at
both ends with buttons. Although this does not provide
fixation as rigid as syndesmotic screws,
it may facilitate motion of the distal tibiofibular joint.
35. POSTERIOR MALLEOLAR
FIXATION
Recent evidence indicates that fixation of the posterior
malleolus with an intact posterior inferior tibiofibular
ligament adequately stabilizes the syndesmosis.
The posterior malleolus can be fixed utilizing
percutaneous anterior-to-posterior screws when the
fragment is minimally displaced.
An open posterolateral surgical approach to the ankle with
antiglide plate placement is required for large fragments or
if substantial displacement of the articular surface exists.
37. CONSERVATIVE
TREATMENT
A systematic review by Jones and Amendola identified six clinical studies
evaluating outcomes after conservative treatment. All studies showed
prolonged recovery in syndesmotic sprains compared with lateral ankle
sprains.
While none of these studies utilized functional outcome measures,
Nussbaum et al. found that injury to the interosseous membrane proximal to
the ankle joint correlated with a longer time to return to activity after
conservative treatment compared with lateral ankle sprains.
Taylor et al. reported an average time to full activity of thirty-one days for
football players following conservative treatment
39. SYNDESMOTIC SCREW
There are no major differences in functional outcomes
between single and double screws, tricortical and
quadricortical screws, transsyndesmotic and
suprasyndesmotic screws, stainless steel and titanium
screws, or metal and bio absorbable screws.
40. SUTURE BUTTON
A recent systematic review found that suture-button fixation
yielded American Orthopaedic Foot & Ankle Society (AOFAS)
scores at twelve and twenty-eight months similar to those for screw
fixation.
Patients with suture-button fixation also returned to work earlier
and had less frequent need for implant removal compared with
those who had screw fixation.
While a suture button is more expensive than screws and lacks
conclusive evidence of superiority, the decreased need for surgical
removal may make this technique more cost-effective
41. POSTERIOR MALLEOLUS
FIXATION
Gardner et al. randomly assigned ten cadaveric
specimens with replicated fracture patterns to either
posterior malleolar fixation or syndesmotic fixation.
Posterior malleolar fixation restored stiffness to 70%,
and syndesmotic fixation restored stiffness to 40% of
that noted in the intact specimens.
42. Miller et al. prospectively treated thirty-one unstable ankle fractures with
preoperatively confirmed syndesmotic injuries and an intact posterior
inferior tibiofibular ligament
(1) open posterior malleolar fixation whenever the posterior malleolus
was fractured, regardless of fragment size
(2) locked syndesmotic screws in the absence of posterior malleolar
fracture
(3) combined fixation in fracture-dislocations and severe soft-tissue
injury to the other ankle ligaments
44. MALREDUCTION
Anatomic reduction of the syndesmosis is essential for improving functional outcomes
and avoiding posttraumatic osteoarthritis
A prospective study by Sagi et al. found that, at the time of the two-year follow-up,
individuals with a malreduced syndesmosis had significantly worse functional
outcomes than individuals with anatomic reductions
a study comparing suture-button and screw fixation found that malreduction was the
only variable that affected clinical outcomes
Recent studies have noted syndesmotic malreduction in 25.5% to 52% of patients
45. Direct visualization of the tibiofibular joint can reduce the malreduction rate
from approximately 50% to 15%.
Intraoperative three-dimensional imaging can also accurately detect
malreduction
Images of the contralateral, uninjured ankle can be used to assess the accuracy of
reduction of the syndesmosis
Song et al. sought to determine the effect of screw removal on the alignment of
the distal tibiofibular joint. Patients with intact implants and symptomatic
malreduction may only require simple screw removal rather than extensive
revisions
46. HARDWARE FAILURE AND
IMPLANT REMOVAL
Syndesmotic fixation limits fibular biomechanics during normal
motion of the ankle.
As patients increase weight-bearing and resume activities, shear
stresses can cause syndesmotic screws to break.
Screw breakage has been reported to occur in 7% to 29% of patients
who have had fixation, depending on the time of screw removal.
Stuart and Panchbhavi found that 3.5-mm screws were significantly
more likely to break than were 4 mm or 4.5-mm screws
47. Syndesmotic screw removal at six weeks reduces the rate of implant failure,
but increases the rate of recurrent diastasis.
Studies have found no significant difference in outcomes between patients
with retained screws and those with the screws removed.
However, several studies have shown that patients with retained broken
screws had better functional outcome scores than patients with retained
intact screws
The findings outlined above suggest that restoration of normal fibular motion
and alignment of syndesmosis profoundly impact functional outcomes,
whether through implant removal, loosening, or breakage.
48. Screw removal is not without risk, however. Schepers et al.
demonstrated a 22.4% complication rate following routine
removal of syndesmotic screws, including infection in 9.2%
and recurrent diastasis in 6.6%
49. HETEROTOPIC OSSIFICATION
Several studies have described the development of heterotopic ossification following
syndesmotic disruption.
Taylor et al., in a report on fifty syndesmotic sprains in forty-four football players, found
that 50% of the patients with radiographs developed heterotopic ossification.
Böstman reported a higher prevalence of heterotopic ossification after fixation with
bioabsorbable screws
Heterotopic ossification can lead to ankle synostosis, resulting in pain and abnormal ankle
kinematics.
The prevalence of syndesmotic synostosis after an ankle fracture has been reported to range
from 1.7% to 18.2%..
50. OVERVIEW
Despite the amount of research devoted to
syndesmotic injuries, many unanswered questions
remain.
Syndesmotic injuries are difficult to diagnose and
treat, with malreductions remaining commonplace.
The effectiveness of the gold-standard syndesmotic
screw fixation method is being brought increasingly
into question.
51. Obtaining anatomic reduction is essential, and the use of
intraoperative three-dimensional imaging or open visualization may
be warranted.
The need for routine screw removal remains controversial.
Although screw removal restores normal motion of the fibula and
may allow for spontaneous reduction of malreductions, the data
remain inconclusive. A complete summary of recommendations for
care is given in
3 – despite common occurance
4 - With such variation and disagreement in treatment strategies, orthopaedic surgeons need to understand the complex nature of the distal tibiofibular joint, pitfalls associated with treatment, and current evidence regarding management of syndesmotic injuries
The anterior inferior tibiofibular ligament (35%) and deep posterior inferior tibiofibular ligament (33%) contribute the most to ankle stability, followed by the interosseous ligament (22%) and superficial posterior tibiofibular ligament (9%)
2 - In plantar flexion, the fibula migrates distally, translates anteromedially, and internally rotates. With dorsiflexion, the fibula migrates proximally, translates posterolaterally, and externally rotates. Externally rotating the foot causes medial translation, posterior displacement, and external rotation of the fibula through the syndesmosis
3 --
McKeon et al. examined the vascular components of cadaveric ankle specimens12 (Fig. 2). In 86% of the specimens, the anterior syndesmotic ligaments were predominantly vascularized by the anterior branch of the peroneal artery. In 63% of the specimens, the anterior syndesmotic ligaments were only vascularized by the anterior branch of the peroneal artery. The posterior branch of the peroneal artery provided the predominant blood supply to the posterior syndesmotic ligaments in 100% of the specimens. The anterior branch perforated the interosseous membrane at an average height of 3 cm proximal to the ankle joint. Therefore, the blood supply to the anterior syndesmotic ligaments is at considerable risk of injury.
These forces cause the talus to abduct or rotate externally in the mortise, leading to disruption of the syndesmotic ligaments
Physical examination can be conducted after three to five days of rest, ice, compression, and elevation (RICE) and nonsteroidal anti-inflammatory drugs without sacrificing diagnostic accuracy. However, as many as 20% of syndesmotic injuries may go undetected on clinical examination
radiographic evaluation often fails to detect subtle syndesmotic injuries, so CT and MRI
While both tests showed excellent interobserver agreement, the sensitivity of both tests was poor, suggesting that many syndesmotic disruptions go undetected.
Patients transition to Phase II when pain and edema are well controlled and the patient can walk with minimal antalgic gait.
Patients who do not plan to return to athletics can continue on Phase II until asymptomatic. Patients who desire to resume athletic activities transition to Phase III when they are able to jog or hop without pain
The primary fibular malpositions were anterior displacement and internal rotation of the distal end of the fibula.
The screw should be positioned 2 to 3 cm proximal to the tibial plafond, directed. parallel to the joint surface, and angled 30 degrees anteriorly so that it is perpendicular to the tibiofibular joint
Postoperative and follow-up Foot and Ankle Outcome Scores were similar in the three groups
Traditional radiographs and fluoroscopy provide inaccurate assessment of syndesmotic reduction, especially concerning fibular external rotatiON
These findings suggest that removal of symptomatic intact screws may be prudent, rather than waiting for breakage or loosening
The pathophysiology of heterotopic ossification and synostosis of the ankle is poorly understood. Additionally, limited data exist with regard to the relationship between heterotopic ossification and functional outcome scores