Recent developments in the treatment of acute syndesmotic injuries

Is routine removal of syndesmotic screw justified? A meta-analysis

BACKGROUND

Syndesmosis injuries are common with rotational ankle injuries, and placement of a positional syndesmotic screw to maintain its reduction is used as the ligaments heal. There is no clear consensus on routine removal or retention of syndesmotic screw. This study aimed to appraise the current evidence both on removal and retention of syndesmotic screw and to conduct a meta-analysis comparing outcomes and rate of complications of syndesmotic screw removal and retention.

METHODS

Following PROSPERO registration, a systematic search using was performed using keywords ('Syndesmosis' OR 'Syndesmotic' OR 'Transsyndesmotic' OR 'distal tibiofibular') AND ('Screw') AND ('Removal' OR 'Retention') AND 'Outcome' in various databases. No language restrictions were applied and the meta-analysis incorporated the PRISMA statement. VAS (Visual analogue scale for pain), AOFAS (American Orthopaedic Foot And Ankle Society) scores expressed as mean ± SD, and both groups' complication rates were compared. Comparisons with a random-effects model were performed, and heterogeneity between the studies was calculated using the I2 statistic. T-test for two independent sample means was used to compare pooled mean and Z-test for two proportions to assess the difference in the proportion of complications.

RESULTS

A total of 7 studies with 522 patients were included in this review for analysis. Pooled analysis showed non-significant difference in AOFAS score (MD = -1.84; 95% CI: -4.33 to 0.66; p = 0.150) as well as for VAS score (MD = -0.48; 95% CI: -1.56 to 0.60; p = 0.390) between the two groups. The value of z and p-value for complication rates was 0.6021 and 0.5485, respectively, which was not significant.

CONCLUSION

There doesn't appear to be a difference in functional outcome, pain scores, and complication rates between patients who had their syndesmotic screws removed and those where screw was retained. The fear of inferior outcomes with retained screws is thus unfounded, and routine removal adds to morbidity and financial burden. In conclusion, present data does not support the routine removal of the intact syndesmosis screw, and a change in practice is needed to abandon routine syndesmotic screw removal.

[Minimally invasive fixation of distal fibular fractures with intramedullary nailing]

OBJECTIVE

Minimally invasive osteosynthesis of distal fibula fractures serves as a biomechanically stable and soft-tissue-friendly fixation method in the case of an unstable fracture, poor bone quality, and/or critical soft tissue conditions with restoration of the length, axis and rotation of the distal fibula as well as stabilization of the ankle mortise. The goal is to reduce and stabilize the distal fibular fracture in a quick and stable manner that protects the soft tissues in ankle fractures.

INDICATIONS

Unstable malleolar fractures and fracture dislocations; fibular fractures in combination with distal tibia fractures; critical soft tissue conditions around the ankle.

CONTRAINDICATIONS

No consent to surgery by the patient. Overall critical (life-threatening) general condition preventing surgery to the extremities. Very narrow medullary canal of the fibula (less than 3 mm, depending on the implant).

SURGICAL TECHNIQUE

Percutaneous placement of a guidewire into the distal fibular tip, opening the medullary canal and drilling the medullary canal in the distal fragment. Reduction of the axis by introduction of the fibular nail, with additional percutaneous use of reduction clamps for restoration of fibular length and rotation, if necessary. Placement of distal locking screws over the targeting device while maintaining rotation and length, in addition proximal static locking is mandatory to maintain the length of the fibula. In case of residual syndesmotic instability after fracture fixation, syndesmotic screws are inserted through the fibular nail via the aiming device.

POSTOPERATIVE MANAGEMENT

Following surgery, rest and elevation of the injured leg, and local cooling are indicated. Subsequently, mobilization with partial weight bearing (15-20 kg) in an ankle foot orthosis or plaster/cast for 6 weeks.

RESULTS

Minimally invasive fibular fixation with an intramedullary nail results in a significantly lower rate of wound healing complications compared with lateral plating. Reported union rates range from 97.4 to 100% with current nail designs. The quality of reduction and functional outcome is comparable to that after plate fixation. A certain learning curve has to be respected.

Indications and Surgical Treatment of Acute and Chronic Tibiofibular Syndesmotic Injuries with and Without Associated Fractures

Syndesmosis injury may occur in a wide variety of clinical scenarios. Accurate diagnosis and anatomic reconstruction are necessary for optimizing clinical outcomes. The management considerations of syndesmotic injuries with associated proximal fibula fractures are reviewed. Methods to improve the accuracy of syndesmotic reduction are outlined. The management of fractures of the posterior malleolus, Chaput tubercle, and Wagstaffe tubercle is discussed with an emphasis on their contributions to syndesmotic stability. The evolving role of flexible fixation for syndesmosis injuries is discussed. Causes and strategies for dealing with loss of reduction and malreduced syndesmotic injuries are presented.

Assessing Quality of Syndesmotic Reduction in Surgically Treated Acute Syndesmotic Injuries: A Systematic Review

There is no universal method with cutoff values for the assessment of distal tibiofibular joint reduction in acute syndesmotic injuries. It is important to detect malreductions because they may lead to impaired functional outcome and may demand reoperations. The aim of this study was to systematically review the literature to evaluate the appropriateness of different image techniques in determining syndesmotic malalignment. A literature search was conducted in Medline, Embase, and the Cochrane Library to search for articles assessing syndesmotic reduction. Excluded were articles where no criteria and/or measurements for syndesmotic reduction were provided, only normative values were provided and reviews. In total, 2157 articles were found, of which 1421 studies were screened for title and abstract after exclusion of duplicates. One hundred ten studies were eligible for full-text analysis. Of these, 61 were excluded. Three studies where added after screening the included references. Fifty-two studies were included, of which 32 were original publications and 20 were publications referring to the original publications. From the original publications, 14 used plains radiographs, 19 computed tomographic (CT) scans, and 5 used 3-dimensional CT scans (some authors used >1 modality in their study). For each modality, a large number of parameters and different cutoff values were reported. CT scanning is superior to plain radiography in the assessment of the quality of joint reduction. Parameters used the most were fibular position in the incisura and fibular rotation. The criteria for adequate reduction should at least include the position of the fibula in the incisura and rotation of the fibula, while ensuring adequate fibular length, all equaling or at least approaching the values of the uninjured contralateral side.

Acute and Chronic Syndesmotic Injury: The Authors' Approach to Treatment

Ankle injuries are a common traumatic injury. Rupture to the syndesmosis may occur as a result of these injuries. Strategies for the treatment of both acute and chronic syndesmotic repair are reviewed in detail. Significance of Chaput, Wagstaffe, and posterior malleolus fractures on syndesmotic stability are reviewed. Treatment considerations for total ankle arthroplasty are discussed, and correction of coronal plane deformity as a result of late syndesmotic injury at the time of ankle arthroplasty is outlined.

Routine versus on demand removal of the syndesmotic screw; a protocol for an international randomised controlled trial (RODEO-trial)

BACKGROUND

Syndesmotic injuries are common and their incidence is rising. In case of surgical fixation of the syndesmosis a metal syndesmotic screw is used most often. It is however unclear whether this screw needs to be removed routinely after the syndesmosis has healed. Traditionally the screw is removed after six to 12 weeks as it is thought to hamper ankle functional and to be a source of pain. Some studies however suggest this is only the case in a minority of patients. We therefore aim to investigate the effect of retaining the syndesmotic screw on functional outcome.

DESIGN

This is a pragmatic international multicentre randomised controlled trial in patients with an acute syndesmotic injury for which a metallic syndesmotic screw was placed. Patients will be randomised to either routine removal of the syndesmotic screw or removal on demand. Primary outcome is functional recovery at 12 months measured with the Olerud-Molander Score. Secondary outcomes are quality of life, pain and costs. In total 194 patients will be needed to demonstrate non-inferiority between the two interventions at 80% power and a significance level of 0.025 including 15% loss to follow-up.

DISCUSSION

If removal on demand of the syndesmotic screw is non-inferior to routine removal in terms of functional outcome, this will offer a strong argument to adopt this as standard practice of care. This means that patients will not have to undergo a secondary procedure, leading to less complications and subsequent lower costs.

TRIAL REGISTRATION

This study was registered at the Netherlands Trial Register (NTR5965), Clinicaltrials.gov ( NCT02896998 ) on July 15th 2016.

Randomized Trial Comparing Suture Button with Single Syndesmotic Screw for Syndesmosis Injury

BACKGROUND

This study compared clinical and radiographic results between patients who underwent stabilization of an acutely injured syndesmosis with a suture button (SB) and those treated with 1 quadricortical syndesmotic screw (SS).

METHODS

Ninety-seven patients, 18 to 70 years old, with an ankle injury that included the syndesmosis were randomized to 2 groups: SB (48 patients) and SS (49). The main outcome measure was the score on the American Orthopaedic Foot & Ankle Society (AOFAS) ankle-hindfoot scale. The secondary outcome measures were the Olerud-Molander Ankle (OMA) score, visual analog scale (VAS), and EuroQol-5D (EQ-5D) Index and VAS. Computed tomography (CT) scans of both ankles were obtained at 2 weeks and 1 and 2 years after surgery. Both groups were allowed partial weight-bearing at 2 weeks and full weight-bearing at 6 weeks. The mean time for SS removal was 85.9 days (range, 39 to 132 days) after surgery. The patients were followed at 6 weeks, 6 months, and 1 and 2 years. Two years of follow-up were completed for 87 (90%) of the patients (46 in the SB group and 41 in the SS group).

RESULTS

The SS group had more injuries to the posterior malleolus than the SB group. At 2 years, the median AOFAS score was higher in the SB group than in the SS group (96 [interquartile range, or IQR, 90 to 100] versus 86 [IQR, 80 to 96]; p = 0.001), as was the median OMA score (100 [IQR, 95 to 100] versus 90 [IQR, 75 to 100]; p < 0.001). The SB group reported less pain during walking at 2 years than the SS group (median VAS score, 0 [IQR, 0 to 1] versus 1 [IQR, 0 to 2]; p = 0.008) and less pain during rest (median VAS score, 0 [IQR, 0 to 0] versus 0 [IQR, 0 to 1]; p = 0.04). There was no difference between treatments groups with regard to pain at night or during daily activities at 2 years. The SB group had a higher median EQ-5D Index score at 2 years (1.0 [IQR, 1 to 1] versus 0.88 [IQR, 0.8 to 1.0]; p = 0.005). Twenty of 40 patients in the SS group had a difference in the tibiofibular distance of ≥2 mm between the injured and uninjured ankles at 2 years, compared with 8 of 40 in the SB group (p = 0.009). Seven patients in the SS group had symptomatic recurrent syndesmotic diastasis during the treatment period compared with none in the SB group (p = 0.005).

CONCLUSIONS

The patients treated with an SB had higher AOFAS scores, OMA scores, and EQ-5D Index scores as well as lower (better) VAS scores for pain during walking and pain during rest. Also, the SB group had less widening seen radiographically at 2 years than did the patients in the SS group. No differences in the scores for pain at night or during daily activities were identified.

LEVEL OF EVIDENCE

Therapeutic Level I. See Instructions for Authors for a complete description of levels of evidence.