The Maisonneuve fracture was initially described in 1840 by Dr. Jacques
Maisonneuve1. The
initial description involved a proximal fibular fracture associated with an
injury to the medial ankle structures. Lauge-Hansen then classified this
fracture as a pronation-external rotation variant, with disruption of the
syndesmosis2.
Danis3 and
Weber4 classified
these injuries as type-C fractures, and the AO/ASIF Group described them as
type-C3
injuries5.
This pronation-external rotation mechanism involves either an avulsion
fracture of the medial malleolus or disruption of the deltoid ligaments. This
is followed by an external rotation force that causes disruption of the
syndesmotic ligaments and the interosseous membrane. The energy pattern
continues along the path of the interosseous membrane and exits in the
proximal fibular region. Proximal tibiofibular dislocation initially was
described by
Dubreuil6 in 1844
and then by Malgaigne in
18557.
We present the case of a patient who sustained a pronation-external
rotation injury involving an avulsion of the medial malleolus, with disruption
of the deltoid ligaments and the proximal tibiofibular joint. There was no
fibular fracture, but the patient did sustain an ipsilateral tibiofibular
dislocation. On the basis of our review of the literature, we do not believe
that this association has been described previously. The patient was informed
that data concerning this case would be submitted for publication.
Aseventeen-year-old boy presented to the emergency room after a twisting
injury of the left ankle. Initially, he was thought to have an ankle sprain
with no evidence of fracture. The patient was managed with a splint because of
severe soft-tissue swelling and was referred to the orthopaedic surgery
department.
The patient presented to us one week after the injury. At that visit, he
was noted to have extensive swelling about the ankle, both medially and
laterally, as well as prominence of the proximal tibiofibular joint.
Furthermore, the patient had acute tenderness at the proximal tibiofibular
joint as well as over the anterolateral joint line and distal to the medial
malleolus. The patient also reported pain with external rotation of the ankle.
The limb was intact neurovascularly. A review of the radiographs revealed a
small fragment of bone lying just distal to the medial malleolus, consistent
with an avulsion-type injury. Comparison stress radiographs demonstrated 4 mm
of medial clear space in the uninjured (right) ankle and 5.4 mm of medial
clear space in the injured (left) ankle. Although subtle, this did represent
abnormal medial clear space
widening8. The
talocrural angle measured 14.2° on the uninjured (right) side and 6.2°
on the injured (left) side (Figs.
1 and
2), exceeding the normal
side-to-side difference of 2° to
4°9. Radiographs
as well as magnetic resonance images of the proximal tibiofibular joint
demonstrated anterior dislocation (Figs.
3 and
4). These studies were
consistent with disruption of the syndesmosis and proximal tibiofibular
dislocation.
After a lengthy discussion with the patient and his family with regard to
the benefits and risks, the patient underwent surgery ten days after the
injury. We were unable to complete a closed reduction of the proximal
tibiofibular joint. The fibula was reducible, but it sprang into a dislocated
position (Fig. 5). A decision
was then made to perform an open reduction of the proximal tibiofibular joint.
A 4-cm curvilinear incision, based over the anterior border of the fibula and
carried proximally along the posterior border of the iliotibial band, was
performed. Dissection was carried through the subcutaneous tissues to the
level of the iliotibial band. Further dissection continued posterior to the
iliotibial band, exposing the proximal part of the fibula. The peroneal nerve
was dissected proximally beneath the biceps femoris muscle belly, and the
dissection was carried down to its bifurcation around the fibular head. The
proximal part of the fibula was button-holed through the capsule, but we were
unable to reduce it. We then incised the capsule. The fibula then
spontaneously reduced into the tibiofibular joint. The fibula was grossly
unstable, even after capsular repair, and therefore was held with a transverse
4.5-mm cannulated screw (Fig.
6).
Our attention was then turned to the distal syndesmosis, where a 2-cm
incision over the distal part of the fibula was performed. Two 3.5-mm fully
threaded cortical screws were placed proximal to the distal tibiofibular
joint, capturing four cortices, and were supported with a two-hole plate
(Fig. 7). Reduction of the
distal tibiofibular joint was confirmed intraoperatively with fluoroscopic
examination.
Postoperatively, the patient was kept non-weight-bearing for a twelve-week
period. After initial splinting and suture removal at two weeks, he was
managed with a removable cast-boot and began knee and ankle range-of-motion
exercises. Six months postoperatively, we removed both syndesmotic screws and
the proximal tibiofibular screw. Eight months postoperatively, radiographs
demonstrated maintenance of the reduction and restoration of a normal medial
clear space and talocrural angles. Clinical follow-up at eight months revealed
complete restoration of normal proximal tibiofibular contours and full ranges
of motion of the knee and ankle. The patient was pain-free and had resumed
playing competitive basketball.
Dislocation of the proximal tibiofibular joint is a rare injury. Ogden
described four types of dislocation: subluxation, anterolateral dislocation,
posteromedial dislocation, and superior
dislocation28,29.
The diagnosis is based on clinical examination, plain anteroposterior and
lateral radiographs, and computed tomography if necessary.
There is a paucity of data regarding the treatment of proximal tibiofibular
dislocation in the medical literature. The recommended treatment is closed
reduction, which is usually
successful30,31.
Surgery is performed in cases in which reduction is not possible or is not
maintained. Van den Bekerom et
al.32, in the
largest series that we could find, reviewed eight surgical stabilization
procedures that resulted in excellent outcomes. The technique they described
is very similar to the one we used and involves an open approach to the
proximal tibiofibular joint, mobilization of the common peroneal nerve,
fixation with one cancellous screw, and subsequent screw removal after three
to six months.
Miettinen et
al.30 described a
technique for fixation involving a portion of the biceps femoris muscle tendon
and the use of an interference screw for fixation in the proximal part of the
tibia. Other authors have recommended reconstructing the joint with an
iliotibial band graft, various forms of Kirschner-wire fixation, and proximal
resection of the fibular
head31,33,34.
Although somewhat surprising, we were unable to find an association between
a Maisonneuve-type (pronation-external rotation) fracture and an ipsilateral
pure proximal tibiofibular dislocation. This injury bears consideration during
the diagnostic workup of a patient with an ankle injury. ?