Chamseddine2017
Chamseddine2017
DOI 10.1007/s00264-016-3397-7
ORIGINAL PAPER
radial nerve was performed during open reduction and lateral fracture and another with nonunion, underwent revision sur-
plating of the humerus. geries for occurrence and persistence of nonunion respectively.
Operative procedure
Materials and methods
The surgical procedure for fresh fractures followed the de-
This was a retrospective review of medical records and X-rays scription previously reported by two of the authors [10].
of patients in whom a transfracture radial nerve transposition Under general anaesthesia, the patient is placed in a
was performed between January 2008 and December 2015. semisitting position, with the forearm resting on an arm board.
There were 19 patients, six of whom were the subject of a The skin incision is along a portion of a line extending from
preliminary report by two of the authors [10]. In 15 patients, the deltoid insertion on the humerus (deltoid V) to the lateral
the procedure was carried out during plating of a fresh frac- epicondyle and extended proximally into the deltopectoral
ture, while in the remaining four, it was performed during interval when needed. The radial nerve is initially identified
treatment of nonunion and autologous iliac bone grafting. between the vertical fibres of the brachialis muscle and the
There were ten men and nine women ranging in age between oblique fibres of the brachioradialis muscle. The nerve is then
20 and 74 (mean 39) years. The right side was affected in 11 dissected anteriorly and distally between these two muscles.
patients and the left side in eight. The cause of the fracture The lateral intermuscular septum is carefully opened at the
could be specified from the medical records of 13 patients, as emergence of the radial nerve. The proximal part of the nerve
follows: road traffic accident (5), sports injury (3), fall at home is dissected proximally and posteriorly to create a space be-
(3), fall from the first floor (1) and blast injury (1). All frac- tween it and the radial groove at the posterior aspect of the
tures, excluding the blast injury, were closed and displaced humerus. This step typically consists of blind careful dissec-
upon presentation. Fracture location and Arbeitsgemeinschaft tion of this part of the nerve using the tip of the index finger,
für Osteosynthesefragen (AO) classification is shown in along with a cautious pulling manoeuvre of the proximal hu-
Table 1 for fresh fractures and Table 2 for nonunion. Pre- meral fragment using a bone clamp or a thumb–index pinch
operative radial nerve paralysis was present in four fresh frac- using the other hand; this should result in complete separation
tures (Table 1). No patient in the nonunion group had radial of the radial nerve from the posterior aspect of the humerus. A
nerve paralysis at the time of the index procedure. Plate and limited elevation of the brachialis and brachioradialis muscles
screw types used for fixation are detailed in Table 3. from the distal humeral fragment is performed as needed,
All patients had an arm sling for seven to ten days after along with dissection of the medial intermuscular septum in
surgery and underwent immediate post-operative rehabilitation order to prepare the future anteromedial bed of the nerve. At
with active and active-assisted mobilisation for range of mo- the end of the dissection, the radial nerve should be complete-
tion (ROM) recovery of shoulder and elbow joints. All were ly liberated and freely movable from its most proximal to
clinically and radiographically evaluated at one to two month distal part as it emerges from the lateral intermuscular septum.
intervals and up to 12 months after surgery to assess fracture The two main bone fragments are then gently distracted, and
healing, ROM and radial nerve function. Four patients with the fracture site is angulated to allow gentle transposition of
fresh fractures presented back two to three years postfixation the nerve from the lateral to the medial side of the humerus;
for hardware removal because of annoyance and pain at the the nerve should ideally Bfall^ from lateral to medial through
lateral aspect of the distal humerus due to soft tissue irritation the two main humeral fragments, which have been distracted
by a prominent end of the plate. Two patients, one with fresh and angulated (Fig. 1). Fracture reduction and plating is next
IM intermedullary nail
carried out according to AO principles and as dictated by each plate and the Lecestre distal humerus plate, all 17 other plates
particular fracture pattern (Fig. 2). The radial nerve is now were intra-operatively molded to fit the proximal and distal
displaced to its new location at the medial aspect of the hu- lateral aspects of the humerus, as needed.
merus and lies within the muscular mass of the brachialis,
lateral and anterior to the medial intermuscular septum Repeat surgical procedure after radial nerve transposition
(Fig. 3).
When the procedure is applied to patients with nonunion, A repeat procedure was necessary in six patients: hardware
the same surgical steps for radial nerve dissection are per- removal in four patients from the group with fresh fractures,
formed after careful identification of the nerve within the sur- and two new cases of nonunion (one patient from each group).
rounding fibrous scar tissue; transposition of the nerve through Exposure of the lateral plate inserted during radial nerve trans-
the nonunion site is accomplished after removal of the pre- position was performed using a straightforward incision from
existing hardware [plate and screws or intermedullary (IM) the skin down to the plate, without attempting to identify or
nail] and complete surgical release of the nonunion site. expose the radial nerve, which had already been transposed
After nerve transposition, the nonunion is treated according medially (Fig. 6). Plates used to treat the two new cases of
to the initial fracture pattern: parallel cuts of the nonunion nonunion were molded to fit the lateral aspect of the humerus.
edges with mild shortening of the humerus (1 cm) and fixation
with compression technique in three cases (AO type A3)
(Figs. 4 and 5) and reduction with interfragmentary compres- Results
sion along with careful debridement and refreshment of the
nonunion area in one case (AO type B1). A bone graft, har- Radiographic bone healing
vested earlier from the inner table of the posterior iliac crest,
was applied at the site of nonunion for all four cases at the end Fourteen patients with fresh fractures showed complete bone
of fixation. Except for the anatomic proximal humerus locking healing between three and five months postfixation. One patient
FF fresh fracture, NU nonunion, D 1/3 distal third, D 1/4 distal fourth, MS mid shaft, PHP proximal humerus
plate, LCP locking plate, CS conventional screws, LHS locking head screws
International Orthopaedics (SICOT)
graft had a 10° extension lag of the elbow but a full range of
shoulder motion. The 59-year old woman from the fresh-
fracture group who developed nonunion due to technical rea-
sons underwent successful revision but with a resultant 10°
limitation of forward elevation and external rotation in shoul-
der abduction. All other patients showed no restricted elbow
or shoulder ROM compared with the opposite side.
Discussion
Fig. 4 a, b Pre-operative
anteroposterior (AP) and lateral
radiographs of a 32-year-old pa-
tient with nonunion of the distal
fourth of the humerus
[Arbeitsgemeinschaft für
Osteosynthesefragen (AO) frac-
ture type A3]. c, d Post-operative
radiographs showing fixation
with compression after shortening
and copious application of can-
cellous bone graft following radi-
al nerve transposition. e, f
Radiographs at 9 months showing
complete bone healing
International Orthopaedics (SICOT)
transposition and is a contributing factor for potential devel- existing injury to the nerve; in contrast, the gain in nerve
opment of nonunion, which makes even more sense for trans- length secondary to transposition may contribute to its func-
position in such situations. El Ayoubi et al. [6] stated that the tional recovery. On the other hand, like others [5], we believe
suitable indication for transposition is a comminuted fracture that transposition has great and distinct advantages,
of the middle and distal third of the humerus, with a transverse preventing complications during subsequent procedures such
or oblique fracture line running in the same direction of the as hardware removal or treatment for nonunion; the radial
spiral groove and associated with radial nerve paralysis. nerve is constantly surrounded by fibrous scar tissue in such
However, this procedure would also be very helpful even circumstances.
when the radial nerve is not affected, especially if the surgeon A repeat surgical approach to the previous site of fixation
encounters laborious reduction–fixation manoeuvres and faces was performed in six patients in our series: four with fresh
difficulties inserting a lateral plate under the nerve during the fractures underwent hardware removal due to irritation from
lateral approach [6]. The ideal situation for transposition in- a prominent place at the lateral aspect of the distal humerus, as
cludes a fracture location that lies between 2 cm proximal and reported by the patients themselves. Another patient from the
7 cm distal to the midshaft of the humerus, a comminution that same group experienced nonunion and was eventually suc-
results in humeral shaft shortening and soft tissue disruption cessfully revised. Lastly, one patient from the nonunion group
with traumatic spontaneous dissection of the radial nerve [6]. continued to have a resistant nonunion; he underwent five
After reporting our preliminary experience [10], we inten- revision surgeries that finally achieved bone healing. None
tionally began using this technique during ORIF of all humer- of these six patients developed radial nerve paralysis after
al shaft fractures located in the area defined by El Ayoubi et al. repeat surgery, which was very simple. The lateral incision
[6]. In addition, we extended our indications to the treatment was carried from the skin to the plate without the need to
of humeral shaft nonunions in the same area. As far as we identify the radial nerve, which had been previously trans-
know, this procedure has not previously been reported for posed to the medial aspect of the humerus. El Ayoubi et al.
such an indication. [6] and Olarte et al. [5] made the same comment after treating
Pre-operative radial nerve paralysis was seen in four pa- one and two cases, respectively, of nonunion that occurred in
tients (26.6%) in our group of 15 fresh fractures, in three their respective series of six and ten cases with previous radial
(30%) in the series of ten patients by Olarte et al. [5], in three nerve transposition.
(50%) in the series of six by El Ayoubi et al. [6] and in two Although radial nerve dissection in the four patients in our
(33%) of the Korean series of six by Lee et al. [9]. Although nonunion group was technically more difficult (the nerve was
those incidences are high, all patients recovered after surrounded by a fibrous scar tissue), reduction of the nonunion
transfracture medial transposition of the radial nerve and frac- site was easier after transposition, and there was no post-
ture fixation (no mention regarding radial nerve recovery in operative radial nerve paralysis. In addition, we noticed that
8). El Ayoubi et al. noted that the radial nerve was in continu- the new location of the nerve makes it safer when positioning
ity in their three cases with pre-operative paralysis: contused the bone graft around the nonunion, avoiding enclosing or
in two and stretched in one. Although we also noted absence encircling the nerve in all six cases treated for nonunion (four
of macroscopic discontinuity of the radial nerve in our four at initial presentation and two following the index procedure)
cases with pre-operative paralysis, the nerve was trapped in (Fig. 4).
the fracture site in one patient and compressed by bony frag- This technique can be criticized because of the potential for
ments in the other three. Olarte et al. [5] did not clarify the additional devascularisation of the humerus related to a more
condition of the radial nerve in their three cases that presented extensive dissection. However, there was no increased inci-
with pre-operative paralysis. Post-operative radial nerve paral- dence of nonunion in our series compared with the literature:
ysis occurred in two patients in our group of 15 fresh fractures 6.6% for fresh fractures and 10.5% for the whole series. In
and in none of the four in the nonunion group or the six who addition, we believe the only case of nonunion in the group of
underwent revision surgery after transposition. Olarte et al. [5] 15 patients with fresh fracture was due to a lack of stability
mentioned no iatrogenic radial nerve paralysis in their report, secondary to using a long proximal humerus locking plate
and El Ayoubi et al. [6] observed one case of post-operative with 3.5-mm locking screws; this plate is relatively thinner,
paralysis, which they attributed to laborious reduction ma- less rigid and less stable than the classically recommended
noeuvres performed before transposing the nerve. All in- broad plate. Treatment of nonunion in this patient was suc-
stances of post-operative paralysis eventually recovered cessfully achieved by easily removing the pre-existing plate
completely (our two cases and the case by El Ayoubi et al.). and refreshing the nonunion site, followed by another fixation
We also believe, like these authors [6], that radial nerve dis- using a broad locking plate with locking head screws of 5.0-
section and transposition does not jeopardise nerve function as mm diameter and iliac bone graft.
much as fracture manipulations do. We hypothesise that radial A broad locking plate was used in 12 patients in our series
nerve transposition per se neither harms nor worsens any pre- (Table 3). This plate is 5.2-mm thick and 17.5-mm wide [23]
International Orthopaedics (SICOT)
and consequently thicker and wider than that used in the ca- 4. Guse TR, Ostrum RF (1995) The surgical anatomy of the radial
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Funding None.
humeral approach for distal shaft fracture of the humerus that oc-
curred during a throwing motion. Int Orthop. doi:10.1007/s00264-
Ethical approval None. 015-2895-3
19. Capo JT, Debkowska MP, Liporace F, Beutel BG, Melamed E
(2014) Outcomes of distal humerus diaphyseal injuries fixed with
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