Supracondylar Osteotomies of Posttraumatic Distal Humeral Deformities in Young Adults - Technique and Results
Fokko Richard Buß*, 1, Arndt-Peter Schulz2, Helmut Lill1, Christine Voigt1
Identifiers and Pagination:Year: 2011
First Page: 389
Last Page: 394
Publisher ID: TOORTHJ-5-389
Article History:Received Date: 20/9/2011
Revision Received Date: 18/11/2011
Acceptance Date: 20/11/2011
Electronic publication date: 30/12/2011
Collection year: 2011
open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
Cubitus varus deformity is the most common late complication after distal humeral fractures in children. Typical symptoms are increasing instability especially the posterolateral rotatory instability (POLRI), lateral elbow pain and cosmetic problems. Different ways of correction have been described but a gold standard has not yet been established.
In this study the clinical outcome 6,5 months after supracondylar closed wedge osteotomy stabilized with locking plates in four young adults was investigated: three with a posttraumatic varus deformity and one with a posttraumatic valgus deformity of the distal humerus.
All patients showed good or excellent results in the Mayo Elbow Performance Score (MEPS) and the Disabilities of the Arm, Shoulder and Hand score (DASH). In one case, a revision because of a delayed union was necessary, in another case a preexisting pseudarthrosis of the radial epicondyle remained. Neither a residual instability of the elbow joint, nor any significant prominence of the lateral epicondyle was observed.
The supracondylar closed wedge osteotomy stabilized by a locking plate is an effective procedure for the correction of posttraumatic distal humerus deformities in young adults with good final functional results.
Cubitus varus deformity is the most common late complication after distal humerus fractures in childhood. The incidence of this complication varies from 10 to 50% .
The causes of the deformity are an overgrowth of the lateral condyle or insufficient growth of the medial condyle (e.g. osteonecrosis, growth defect) . Von LAER  identifies malrotation as the most important factor in late valgus or varus deformities: due to an interfragmentary rotation with a rotation centre on the fossa olecrani not enough collateral supporting bone remains. This causes a collapse of the medial, less often of the lateral column and leads to a varus or valgus deformity.
Most deformities are diagnosed and corrected in childhood. For a long time, cubitus varus has been regarded as a cosmetic problem but O`Driscoll et al.,  describes additional problems. Typical complications of the cubitus varus are growing instability: The mechanical axis, the olecranon and the pull-direction of the triceps tendon are shifted medially. This leads to repetitive external rotation torque on the ulna and stresses the lateral collateral ligament complex. As a consequence, instability, especially posterolateral rotatory instability (POLRI) occurs . Furthermore, the torn medial triceps tendon may snap over the ulnar epicondyle. In this way or as a consequence of being dislocated anterior to the medial epicondyle -induced by the axis deviation- the ulnar nerve may also be compromised . Pain, instability, snapping triceps tendon and ulnar nerve palsy are the main symptoms of varus deformity of the distal humerus.
The valgus deformity of the elbow joint is much rarer. This deformity occurs mostly as a posttraumatic complication and often as a consequence of a nonunion of a lateral condyle fracture. Symptoms of this deviation can be a growing instability of the medial collateral ligament complex and an irritation of the ulnar nerve induced by stretching.
Previous studies described various corrective osteotomy procedures in children. A high incidence of complications led surgeons to use different techniques without defining a gold standard [6-9]. Three different techniques of supracondylar osteotomies are described: Open/closed wedge osteotomy, dome shaped osteotomy and a three dimensional osteotomy.
We present our surgical technique and the results of four cases: Three young patients with a posttraumatic supracondylar varus deformity and one young patient with a posttraumatic valgus deformity treated by a closed wedge osteotomy.
MATERIALS AND METHODS
Between 2003 and 2009 four patients with posttraumatic supracondylar humeral deformities were treated with a closed wedge osteotomy. Three varus deformities and one valgus deformity were corrected. Indications for the intervention were pain in the lateral or medial elbow and instability of the lateral or the medial collateral ligament complex. The median age of the patients, one female and three male, was 25,5 (15-29) years. The time of follow up was 6,5 (6-12) months. All deformities resulted as a complication of distal humeral fractures in childhood.
Radiographs of both arms in full extension and supination of the forearm (AP view) were performed prior to the procedure. The axis was set parallel to the humeral diaphysis in relation to the line through the elbow and wrist centre. By reference to the contralateral side the deformity angle and correction angle were determined.
In our institution a closed wedge osteotomy is preferred, because with this technique a good stability can be achieved, so that an early active mobilization of the elbow can be permitted.
The procedure was performed with the patient placed in supine position in all cases, the arm stored on a moveable radiolucent table. For the lateral closed wedge osteotomy we used the radial approach to the distal humerus: After skin incision proximal of the lateral epicondyle, parallel to the humerus and sharp dissection of the subcutis, the fascia between M. triceps brachii and M. brachioradialis was split. The distal humerus could now be prepared. In all steps the anatomic position of the radial nerve had to take into account. In the following step two K-wires were needed: The first one was aligned in a horizontal line parallel to the joint line, directly proximal of the fossa olecrani. The second K-wire was drilled into the bone under fluoroscopy more proximally, meeting the first K-wire on the contralateral cortex in the previously planned angle. A common angle template was used for determining the correct direction (Fig. 1). The bone was cut in the direction of the K-wires using an oscillating saw, strictly parallel to the joint line in the sagittal dimension. The bony wedge could then be removed and the distal fragment shifted slightly medial but not rotated. Under fluoroscopy a locking plate was placed on the lateral edge of the distal humerus as known from stabilizing distal humeral fractures. Finally the fascia and cutis were closed.
Intraoperative fluoroscopy: K-wires are set after determining the correct angle with the angle template. After X-ray control the bone was osteotomized.
For the correction of a valgus deformity the patient and the arm were positioned in the same way as described above. An ulnar approach was performed, with the skin incision parallel to the distal humerus on the medial epicondyle. The incision was continued through the subcutaneous tissue, the N. cutaneus antebrachii medialis had to be protected. The fascia was cut longitudinally, after which the N. ulnaris had to be located, prepared and secured using a loop. Thereby, the access to the distal humerus was free. The further technique was the same as described above, but from medial.
After the operation, an elbow-immobilizing orthosis was prescribed and only passive motion was allowed for three weeks. For another three weeks, functional aftercare was permitted.
Patient one was a 23 year old man who sustained a left-sided supracondylar humerus fracture at the age of nine years, which led to a valgus deformity of the elbow. His symptoms were pain and snapping at the medial side of the elbow. The examination revealed pain on palpation at the medial epicondyle and a significant laxity of the ulnar collateral ligament complex. Radiographs revealed a valgus deformity of 40°. Surgical procedure as described above proceeded without complication. A follow up radiograph at 2,5 months showed the breakage of two screws next to the osteotomy zone. In suspicion of a delayed union due to too much micro-movement and resulting screw breakage, a revision with partial re-osteosynthesis was performed 11 weeks after primary intervention. Seven months after the index procedure the patient was completely asymptomatic and the range of motion (ROM) of the elbow was painless, with extension 0° and flexion 135°, supination 70° and pronation 80°. The clinical examination revealed no instability of the elbow joint.
Patient two was a 28 year old man who had a supracondylar humerus fracture on the left side at the age of eight. The fracture was treated conservatively with a cast. His main symptom was persistent pain in the lateral elbow. Pain on the radial compartment could be reproduced by local pressure and varus-stress. In addition, there was a posterolateral rotatory instability. The motion of the elbow was not limited in any way and the neurological examination showed no deficits. The physical and radiological examination revealed a varus deformity of the elbow of 20° (Figs. 2, 3). The patient underwent lateral closed wedge osteotomy and follow-up treatment in the above-mentioned way. The follow-up examination six months later showed a consolidation of the bone (Fig. 4). The ligaments were stable; the elbow was pain-free and showed a full range of motion with extension 0° and flexion 140°, supination 80° and pronation 90° (Fig. 5).
Patient Two: Preoperative X-rays of both arms with the determined axes: 10° valgus on the right side and 20° varus on the left side.
Clinical preoperative investigation: The 20°- varus deformity of the right elbow.
The X-ray six months after index operation shows a good correction and complete bony consolidation.
Functional outcome six months postoperative: Full range of motion.
Patient three was the only girl and also the youngest with 15 years of age at surgery. After a conservatively treated right-sided supracondylar humerus fracture at the age of nine, she developed pain in the lateral epicondyle. Her elbow had a full ROM without any sign of instability. The X-ray showed a varus deformity of 15°. After lateral closed wedge osteotomy, a correction to 10° valgus was achieved. Six months postoperatively the patient was completely asymptomatic and the radiographs demonstrated complete consolidation of the osteotomy. The clinical examination showed stable ligaments. The ROM was extension 0° and flexion 140°, supination 80° and pronation 85°. No complications had occurred. One year after the index procedure the implants were removed.
Patient four was male and 29 years old at time of intervention. He had suffered a fracture of the radial condyle at the age of nine. His main symptom was a persistent pain in lateral condyle region. On clinical examination the ROM was extension 0° and flexion 130°, supination 70° and pronation 90°. There was a local pain on palpation of the radial condyle and the lateral ligament complex was instable. The X-ray showed a prominent radial epicondyle with a strong pseudarthrosis of the epicondyle and a varus deformity of 15°. After lateral closed wedge osteotomy with a correction to 10° valgus, revision of the pseudarthrosis and a fixation of the lateral ligament complex the postoperative course were uneventful. On follow up, the above-mentioned symptoms had decreased but had not disappeared completely. The clinical examination showed a good ROM with an extension lag of 10° and flexion 135°, supination 70° and pronation 90°. There was no sign of residual instability. However, there was pain on palpation of the lateral epicondyle. The further radiological investigation showed a persistent hypertrophic nonunion of the radial epicondyle. We recommended a revision but the patient has not yet decided whether to undergo another operation.
During follow up six to twelve months after the index operation, all patients underwent radiography of the elbow, which demonstrated complete consolidation of the osteotomy. The anatomical elbow axis was 10° valgus in all patients. One patient with a delayed union and implant breakage required surgical revision.
The postoperative clinical parameters and score results are shown in Table 1. All patients had a painless range of motion with a median extension of 0° (0 to -10°) and flexion of 137,5° (130 to 140°). The median rotation was 75° (70 to 80°) for supination and 87,5° (80 to 90°) for pronation. No residual instability and no prominence of the lateral epicondyle could be found.
Clinical Outcome and Score Results After Supracondylar Closed Wedge Osteotomies
|Trauma||Age at Osteotomy [Years]||Gender||Axis Preoperative||Angle of Correction||Follow Up (Months)||DASH [GERMA NN 1999] at Follow Up||MEPS [MORRE Y 1993] Pre Operative||MEPS [MORRE Y 1993] at Follow Up||Supination/Pronation||Extension /Flexion||Complications Revision|
|Patient 1||Supracondylar humeral fracture in childhood||23||male||40° valgus||30°||7 (5 after revision)||0||80||100||70/0/80°||0/0/135°||Revised at 10 weeks|
|Patient 2||Supracondylar humeral fracture in childhood||28||male||20° varus||30°||6||0||80||100||80/0/90°||0/0/140°||none|
|Patient 3||Supracondylar humeral fracture in childhood||15||female||15° varus||25°||6||0||85||100||80/0/85°||0/0/140°||none|
|Patient 4||Fracture of the radial Condyle in childhood||29||male||15° varus||25°||12||10,8||65||85||70/0/90°||0/10/135°||Remaining nonunion|
In the follow up examinations patients 1 to 3 were completely asymptomatic and had excellent results in the MEPS  and the DASH . In comparison to preoperative measurements the results for the MEPS improved in all four patients (Table 1). Patient 4 is still symptomatic but has good results with 85/100 points for the MEPS and 10,8 for the DASH. In this case, the X-ray and the CT showed a persistent hypertrophic nonunion.
Cubitus varus deformity is a common late complication of supracondylar fractures in the childhood. There are various options for correction of distal humerus deformities. Different ways of osteotomies, for example dome osteotomy, three dimensional osteotomy, step cut osteotomy or wedge osteotomies have been described [12-14]. Different methods of fixation with K-wire, external fixator, screws or plates have been published [2, 7, 15].
Most published studies focused on patients in the childhood or adolescence [7, 14-16]. So far, only a few studies have dealt with the correction of supracondylar deformities in adult patients. HAHN et al.,  investigated the outcome after supracondylar dome osteotomy and KIM et al.,  found good results for the supracondylar step cut osteotomy in adults. In a previous study of MOON et al.,  young adults were examined after undergoing lateral closed wedge osteotomy. In contrast to us, he used a non-locking single plate fixation. GONG et al.,  performed an oblique closed wedge osteotomy fixed with lateral plating and a lag screw. He treated middle aged patients and revealed good functional results. Our study investigates the clinical and radiographic results after supracondylar humerus closed wedge osteotomies with a locking plate fixation in young adults.
This study shows good clinical results, all patients had good or excellent results in the Mayo elbow performance score  and the DASH score . One revision with a re-osteosynthesis was performed because of a delayed union. One revision because of a persistent nonunion of the radial epicondyle but not of the osteotomy is pending. Other studies with other osteotomy methods and different fixations showed similar results and complication rates. YUN et al.,  reported of excellent results in 91% of cases, in which supracondylar humerus deformity was corrected with reverse-V-osteotomies fixed with K-wires in children. In this study two patients of twenty-two had complications: One had an intra-operative fracture of the step cut spike, the second had temporary ulnar nerve palsy. HAHN et al.,  reported about 19 cases of correcting supracondylar deformity with a dome osteotomy fixed with plates and screws. Thirteen patients achieved excellent and six good results, no complications were observed. Also TAKAGI et al.,  found that different methods seem to achieve similar results. He examined patients with different osteotomies: closed wedge-, dome shape-, step cut- and three dimensional osteotomies. K-wires were used for fixation. The 86 treated patients were on average 11,1 years (range, 3 to 31years) old and were followed up 35 months postoperatively. The study observed differences regarding radiological outcome: The group with multiplanar correction had an average loss of correction of 3,6°, the group with uniplanar correction 0,7°. In this study, complications occurred in six patients.
Lateral Epicondyle Prominence
In our study no subjective or objective prominence of the lateral epicondyle was observed. This could be due to two factors:
The Surgical Technique
When the medial cortex is cut as described above, the distal fragment can shift medially. WONG et al.,  reported about 14 of 22 patients with a significant prominence of the lateral epicondyle. He found that this complication is caused by only hinging the distal fragment on the medial cortex. So he also recommended cutting the cortex and letting the distal fragment shift medially.
The Early Training of the Arm
Atrophy of the muscles as a consequence of immobilization also leads to lateral epicondyle prominence . With a stable fixation early active mobilization could be permitted and atrophy prevented.
Varus Deformity Accompanied by Nonunion
One patient in our study is still symptomatic and the radiography shows a persistence of the preexisting nonunion of the radial epicondyle with a consolidated osteotomy. His main clinical symptoms resulted from nonunion of the lateral condyle, deformation and instability. TIEN et al.,  reported about 8 similar cases in which a combined varus deformity and a nonunion of the radial condyle were corrected through a dome osteotomy combined with a screw fixation of the lateral condyle. Patients in this study were children at the average age of 8,6 years. The study observed excellent or good results for six patients and fair results for two patients. In the last two cases symptoms decreased but did not disappear. The combination of varus deformity and nonunion of the radial condyle seems to be special in view of the clinical symptoms and is a challenging combination for the surgeon. Further studies are needed to improve the success rate of the surgical treatment of these special cases.
Necessity for Further Correction?
Another question is whether to correct other dimensions because of complex deformities. Often the varus deformity is accompanied with an internal rotation or a hyperextension of the humerus. In our survey no further significant deformities which had to be corrected were observed. TAKGI et al.,  found that it is not necessary to correct an internal rotation because the range of motion and the activities of daily living seem not to be significantly affected by this deformity. Such a rotation defect is difficult to define correctly and is also difficult to correct. A hyperextension deformity should be corrected in adults when it is significant and restricts the range of motion.
Limits of the Study
The mayor limits of this study are the small number of patients and the heterogeneity of the group (one valgus deformity, three varus deformities, one of which included a pseudarthrosis). Furthermore, the study design is retrospective.
The supracondylar closed wedge osteotomy with a medial fragment shift and a single locking plate fixation as described in this study is a sufficient method to treat posttraumatic deformities in young patients with good functional results. Compared with other methods (dome osteotomy, three dimensional osteotomy, double plating) it is less invasive. The varus deformity combined with a pseudarthrosis of the radial epicondyle seems to be a special case with a higher risk of complications and failure. Further studies are needed to improve the success rate of the surgical treatment of these cases.
CONFLICT OF INTEREST
The authors declare that they have no conflict of interest.