a monteggia fracture is a rare injury consisting of a proximal ulnar fracture with associated radial head dislocation .
notable differences exist in the treatment and outcomes of monteggia fractures in pediatric and adult populations , with children often having a better prognosis
. surgical fixation of these fractures through percutaneous techniques is typically reserved for skeletally immature pediatric patients .
this case report depicts a skeletally mature patient with a left monteggia equivalent fracture who underwent percutaneous reduction and flexible intramedullary nailing of a displaced radial head fracture , and open reduction and internal fixation ( orif ) of a proximal olecranon fracture .
her unique case demonstrates that percutaneous techniques can be utilized in fracture reduction and fixation in skeletally mature patients .
a skeletally mature 14-year - old right - hand - dominant female with no significant past medical history presented with left elbow pain .
three days prior to presentation , she fell from a height of 3.7 meters , landing onto her left arm .
she was taken to an outside hospital where left elbow radiographs and a ct scan were performed .
these revealed a comminuted , displaced left radial head fracture and a non - displaced proximal olecranon fracture , consistent with a monteggia equivalent fracture .
the patient was subsequently placed into a posterior long arm splint and was instructed to follow - up with an orthopaedist as an outpatient . upon presentation to the clinic , the patient noted improving , but persistent , pain about the lateral aspect of her left elbow , for which she was medicating with acetaminophen with codeine .
of note , the patient was the eldest of three children , born via normal spontaneous vaginal delivery with normal developmental milestones , and was two years post - menarchal .
the posterior splint was removed , and the skin was intact with a significant amount of swelling around the left elbow .
there was tenderness to palpation at this site , but no tenderness or swelling proximally or distally .
she had intact extensor pollicis longus , flexor pollicis longus , and interosseous function , and no pain or difficulty with active metacarpal - phalangeal joint extension .
four days after presenting to the clinic ( seven days post - injury ) , the patient was taken to the operating room where a 1.57  mm k - wire was inserted into the fracture site and levered up to perform a percutaneous reduction ( fig .
3a ) . a nearly anatomic reduction was achieved , and great care was taken to not penetrate the anterior tissues near the posterior interosseous nerve . since the fracture was still impacted and slightly rotated , the decision was made to insert a flexible intramedullary nail for internal fixation ( metaizeau technique ) . to accomplish this , a previously bent 2.5 
this was rotated around , an excellent reduction was obtained , and the pin was then cut short at the skin level . the olecranon was then observed to be unstable under fluoroscopy .
a rush rod was initially attempted for fixation , but as this did not produce a stable reduction , an olecranon plate was placed which obtained excellent fixation both proximally and distally .
the plate was secured with both locking and non - locking screws , as well as a diaphyseal shaft screw ( fig .
the patient progressed well post - operatively . at her first post - operative visit ten days after surgery , her pain was controlled without medications and she remained neurologically intact .
the k - wire was then removed one week later , and the patient was started on gentle left elbow range of motion exercises in a sling .
her range of motion five weeks after surgery was from 35 to 100 degrees of flexion - extension , 10 degrees of pronation and 50 degrees of supination .
she was started on more aggressive range of motion therapy , resulting in an improvement to 25125 degrees of flexion - extension by post - operative week 13 . at five months post - operatively , after noting mild prominence of the olecranon plate and a residual left elbow flexion contracture of 25 degrees , the patient underwent arthroscopic release of the anterior capsule as well as excision of scar tissue which had formed in the anterior compartment .
the patient attained full left elbow extension , flexion to 130 degrees , and supination - pronation to 85 degrees post - operatively .
a monteggia fracture refers to a fracture of the proximal ulna with associated dislocation of the radial head .
type 1 fractures are an anterior radial head dislocation and proximal third ulna fracture , type 2 fractures are a posterior radial head dislocation and proximal ulna fracture , type 3 fractures are a lateral radial head fracture and proximal ulna fracture , and type 4 injuries refer to a dislocation of the radial head in any direction with fractures of both the proximal radius and ulna
. a relatively uncommon injury , monteggia and equivalent fractures account for approximately 12% of all forearm fractures .
the management of monteggia fractures in pediatric patients is typically dictated by the characteristics of the ulna fracture . in children , plastic deformation or incomplete fractures
are initially treated with closed reduction followed by immobilization in full supination and 110 degrees of elbow flexion for six weeks .
this technique is used almost exclusively in the pediatric population as it often does not achieve a precise reduction ; children , however , can tolerate this due to their remodeling capacity . in the case of long oblique or comminuted fracture patterns in children ,
treatment should consist of internal fixation with a plate ( often one - third tubular or semitubular ) and screw construct rather than intramedullary nail fixation .
in regards to the radial head , dislocation is typically evidenced radiographically when a line drawn through the center of the proximal radial shaft and head does not intersect the capitellum . for incomplete fractures , closed reduction
is often attempted by flexion , supination , and direct pressure on the radial head .
alternatively , closed reduction of the radial head can be achieved through traction and counter - traction applied to the forearm , followed by rotation of the forearm until the maximum prominence of the radial head is palpated .
a varus force is subsequently applied to the elbow and the radial head is reduced by direct digital pressure .
furthermore , leonidou et al . reported success with closed reduction and conservative management in their series of 40 pediatric monteggia fracture cases .
the degree of radial head displacement can be assessed by drawing a line down the center of the radial shaft and comparing it to a line perpendicular to the radial head articular surface .
operative reduction of a displaced radial head / neck fracture is indicated when there is over 30 degrees of residual angulation after attempted closed reduction .
percutaneous approaches include the use of a steinmann pin , k - wires or intramedullary nails .
reduction is initially attempted by applying pressure on the lateral aspect of the elbow while performing repetitive supination - pronation maneuvers .
after , an incision is made just proximal to the distal radial physis and a flexible k - wire or intramedullary nail is introduced into the shaft .
the nail is then advanced proximally in a retrograde fashion until reaching the distal aspect of the displaced radial epiphysis .
rotation of the intramedullary nail allows for manipulation , and ultimate reduction , of the radial head / neck fracture fragment .
if reduction is not possible with the nail , a k - wire can be inserted percutaneously through the lateral aspect of the radial head and used as a lever to assist reduction .
several studies have reported good radiographic and functional outcomes in children treated with the metaizeau technique .
our patient is a skeletally mature individual who sustained a monteggia equivalent fracture with a displaced radial head fracture treated with the metaizeau technique . near anatomic reduction , full supination and pronation , and , ultimately , full extension , was achieved .
consequently , we demonstrate that percutaneous reduction with intramedullary nailing through the metaizeau technique , traditionally described for skeletally immature pediatric patients , can be performed successfully in skeletally mature patients .
given their less invasive nature , percutaneous interventions may be an option in some skeletally mature individuals for radial head / neck fracture reduction and fixation prior to open or more invasive procedures .
the authors declare that there is no conflict of interest regarding the publication of this paper .
written informed consent was obtained from the patient for publication of this case report and case series and accompanying images .
a copy of the written consent is available for review by the editor - in - chief of this journal on request .
bryan g. beutel : data collection , data analysis , writing major portion of the manuscript , final approval of the version submitted .
christopher s. klifto : data analysis , writing major portion of the manuscript , final approval of the version submitted .
alice chu : data analysis , critical revision.key learning pointsmetaizeau technique traditionally described for skeletally immature patients.percutaneous reduction with intramedullary nailing through the metaizeau technique can be performed successfully in skeletally mature patients.percutaneous interventions may be option for treating radial head / neck fracture in skeletally mature individuals prior to more invasive procedures metaizeau technique traditionally described for skeletally immature patients.percutaneous reduction with intramedullary nailing through the metaizeau technique can be performed successfully in skeletally mature patients.percutaneous interventions may be option for treating radial head / neck fracture in skeletally mature individuals prior to more invasive procedures metaizeau technique traditionally described for skeletally immature patients .
percutaneous reduction with intramedullary nailing through the metaizeau technique can be performed successfully in skeletally mature patients .
percutaneous interventions may be option for treating radial head / neck fracture in skeletally mature individuals prior to more invasive procedures
 introductionmonteggia lesions are defined as a fracture of the proximal ulna with an associated radial head dislocation . 
 management of these injuries varies depending upon the patient population , ranging from non - operative treatment with closed reduction and immobilization to surgical fixation . 
 percutaneous techniques of radial head reduction are often reserved for skeletally immature patients.presentation of casein this case report , a 14-year - old female presented with left elbow pain three days after a fall . 
 radiographs and ct images from an outside hospital revealed a displaced left radial head fracture and a non - displaced proximal olecranon fracture , consistent with a monteggia equivalent fracture . 
 the patient underwent percutaneous reduction and internal fixation of the radial head with a flexible intramedullary nail ( metaizeau technique ) , and open reduction and internal fixation of the olecranon . 
 she developed a 25 degree left elbow flexion contracture and , five months after her index procedure , underwent arthroscopic release and removal of hardware . 
 the radial head reduction was near anatomic and she regained full extension.discussionthis report demonstrates that percutaneous reduction with intramedullary nailing and fixation techniques can be performed successfully in skeletally mature patients.conclusiongiven their less invasive nature , we recommend attempting percutaneous interventions in some skeletally mature individuals for fracture reduction and fixation . 
Introduction
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Discussion
Conclusion
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