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Erschienen in: Journal of Orthopaedics and Traumatology 2/2014

Open Access 01.06.2014 | Original Article

Application of distraction osteogenesis in managing bone cysts

verfasst von: Vagif Verdiyev, Farhad Verdiyev

Erschienen in: Journal of Orthopaedics and Traumatology | Ausgabe 2/2014

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Abstract

Background

Despite the great amount of research concerning bone cysts, there is still no commonly accepted method of treatment. The aim of this study was to evaluate the effectiveness managing bone cyst with hybrid external fixator by distraction osteogenesis.

Materials and methods

Between 1982 and 2009, 25 patients with unicameral (20 patients) and aneurismal (five patients) bone cysts were treated using this method. Eighteen patients had a history of pathological fracture at the same location. Cysts were located in the humerus, femur, tibia, and radius. Median follow-up was 48 (range 31–91) months. Results were evaluated on plain radiographs according to the classification system of Capanna et al. Functional assessment was done using the modified system recommended by Enneking et al.

Results

In our study group of 25 bone cysts, 15 were classified as completely healed and nine as healed with residual radiolucency. Recurrence was observed in one patient. Absence of response to treatment was not observed. All patients had excellent functional outcomes, except one with recurrence who was rated poor.

Conclusions

As bone cysts are found in long bones in 90–95 % of patients, and taking into account our achieved positive results in almost all patients, we recommend this method of distraction osteogenesis as a treatment option. It is an effective, economical method of treatment, which eliminates deformity and restores bone length, especially in patients with pathologic fractures.

Introduction

Bone cysts usually present in the pediatric population, and despite its benign nature, more than half of the cases present with pathological fracture [1] and pain, which negatively affects life style, as well as causing continuous trouble for participating in sports, etc. They are one of the most common benign bone lesions in childhood, and in this respect, the problem has important social and health-related issues. Given the varied theories about their occurrence [25], bone cysts in the historical frame have dictated various approaches in treatment, from extremely drastic segmental resections [6], intramedullary nailing [7], curettage with grafting or cementing [8], continuous decompression with cannulated screws [9], steroid [1012] or autogenous bone marrow injection [13, 14], and waiting without intervention. Retrospective analyses of these methods of treatment demonstrate no requirement for drastic approaches, and its optimization requires neither resection nor curettage.
Thus, in an attempt to improve treatment results and decrease the time needed for full recovery, our approach was to destroy the closed cystic cavity and decompress and fill it with distractive regenerative bone tissue, simultaneously eliminating limb-length discrepancy and deformities. The aim of this study was to retrospectively evaluate the effectiveness of treatment for bone cysts using the hybrid external fixator method of distraction osteogenesis.

Materials and methods

Between 1982 and 2009, 25 patients with bone cysts were treated in our hospital with distraction osteogenesis. All patients gave informed consent prior to being included in this retrospective study, which was authorized by the local ethical committee and performed in accordance with the Ethical Standards of the 1964 Declaration of Helsinki as revised in 2000. Mean patient age was 12 (7–18) years. There were 22 boys and three girls. Twenty patients had cysts located in the humerus, three in the femur, one in the distal radius and one in the tibia. Cysts were diagnosed radiologically. Unicameral bone cyst (UBC) was diagnosed in 20 and aneurismal bone cyst (ABC) in five patients. All cases were treated with open and half-open methods, and when the diagnosis was in doubt (22 of 25 patients), radiological diagnosis was confirmed histologically. Eighteen patients had a history of pathological fracture at the same location. Craniocaudal length of the cyst in the axis of the bone was 4–14 (mean 8) cm. Ten patients had active cysts that were in direct contact with the adjacent growth plate (Fig. 1); 15 had inactive cysts that were found at a distance from the growth plate (Table 1). Indications for surgery were cysts with large cavities, pathological fractures, growth arrest with deformities, length discrepancy of the affected limb, and absence of allograft.
Table 1
Data of patients, with details of cysts and treatment
Patient no.
Sex
Age
(years)
Localization
Cyst type
Activity
Pathologic fracture
Craniocaudal length of the cyst
(cm)
Method
Time of frame removal
(months)
Function
Follow-up
(months)
1
M
10
Radius
ABC
Active
No
4
Open
4
Excellent
91
2
M
8
Femur
UBC
Latent
Yes
5
Closed
4
Excellent
89
3
M
14
Humerus
UBC
Active
Yes
7
Open
4
Excellent
89
4
F
8
Humerus
UBC
Latent
Yes
7
Closed
4
Excellent
87
5
M
9
Humerus
UBC
Latent
Yes
7.5
Half open
4
Excellent
84
6
M
9
Humerus
UBC
Latent
Yes
9
Open
4
Excellent
82
7
M
11
Humerus
UBC
Latent
No
14
Open
6
Excellent
75
8
M
11
Humerus
UBC
Latent
Yes
6.5
Half open
4
Excellent
74
9
M
18
Humerus
UBC
Latent
Yes
7
Half open
4
Excellent
74
10
M
18
Humerus
UBC
Active
Yes
10
Open
6
Excellent
73
11
M
15
Humerus
UBC
Latent
No
11.5
Half open
4
Poor
71
12
M
16
Humerus
ABC
Active
No
12
Open
6
Excellent
68
13
M
14
Humerus
UBC
Active
Yes
8
Open
4
Excellent
48
14
F
12
Humerus
ABC
Latent
Yes
11
Half open
6
Excellent
48
15
M
10
Humerus
ABC
Latent
Yes
5
Half open
4
Excellent
46
16
M
7
Humerus
UBC
Latent
Yes
7.5
Open
4
Excellent
45
17
M
17
Humerus
UBC
Active
Yes
7
Open
4
Excellent
44
18
M
11
Humerus
UBC
Active
No
9
Half open
4
Excellent
43
19
F
11
Humerus
ABC
Latent
No
7.5
Half open
4
Excellent
37
20
M
20
Humerus
UBC
Latent
Yes
5
Open
4
Excellent
36
21
M
12
Femur
UBC
Active
Yes
7
Half open
4
Excellent
34
22
M
13
Humerus
ABC
Latent
Yes
9
Open
5
Excellent
34
23
M
14
Femur
UBC
Latent
Yes
9
Closed
5
Excellent
32
24
M
8
Tibia
UBC
Active
No
6
Open
4
Excellent
32
25
M
11
Humerus
UBC
Active
Yes
10
Open
6
Excellent
31
ABC aneurismal bone cyst,UBC unicameral bone cyst
All procedures were performed under general anesthesia, with the use of image intensifier or X-ray to localize the cyst and control the position of wires. External fixator wires were inserted proximally and distally and in some cases (six cases) through cystic cavity (for continuous decompression). The external fixator was assembled according to angulatory, translational, and length deformities. Of the 25 patients, we inserted the distal end of the bone to the proximal end by a closed procedure in three patients, a half-open procedure in nine, and an open procedure in remaining 13. We chose the closed method in patients with pathological fracture with a cyst length <7 cm and radiologically different diameters of proximal and distal fracture ends. The half-open method was used in patients with pathological fracture when fractured ends could not be embedded into each other and in patients with thinned cyst wall but without fracture. We performed osteotomy through a 0.5- to 1-cm incision at the distal end of the cyst that had the smaller diameter. The open method was applied in patients with long cysts (generally >7 cm) with thick walls and septations, with or without pathological fracture (Fig. 2). In some of these cases, we performed iatrogenic circular polyfragmented fracture by applying rounded compression with bone forceps, and we used these fragments as local autografts. Curettage was done in patients treated with the open method and was essentially required in patients with cyst septations to create one cystic cavity because isolated cavities prevent proper healing. Relative indication for curettage was an ABC with a soft-tissue component, which was determined by magnetic resonance imaging (MRI) examination. We avoided curettage in patients with active cysts in direct contact with the physis to avoid its damage and consequential deformities and shortenings.
The amount of shortening depends on the length of the cyst, age of the patient, and presence of limb-length discrepancy. It is preferable to compress the length of the cyst by 1 cm to 50 %, not exceeding 3 cm in order to avoid neurovascular injury. Additional compression with neurovascular status monitoring is possible after operation. Prophylactic hypercorrection was done in patients with active cysts and damaged growth plate in which we anticipated shortening and deformities. In one patient with a cyst length in the bone axis of 14 cm (Fig. 3), we performed a two-stage monolocal compression distraction osteogenesis, first in the distal and then in the proximal part of the cyst, given the poor infilling of distal and proximal areas of the cystic cavity.
In two patients, to enforce and strengthen distraction callus, we intraoperatively added hydroxyapatite ceramic in the cystic cavity, and two other patients postoperatively received bisphosphonate therapy; however, due to their small number, those patients were not included in the analysis.
After 7 days postoperatively, we began distraction with 0.25 mm/three times a day. After limb lengthening and deformity correction, we stopped distraction and fixed the apparatus. After radiological consolidation of newly formed bone was achieved, we removed the frame and the patient began physical therapy. No additional cast or bracing was used.
For radiological evaluation, we used the classification system of Cappana et al. [11]. This four-part system is based on response to treatment: (1) healed—cyst completely healed, filled with bone, and thickened cortical margins; (2) healed with residual—cyst consolidated with thickened cortex but persistent areas of osteolysis and cortical thinning; (3) recurrence—cyst showed initial consolidation following treatment but subsequently showed zones of osteolysis and cortical thinning; (4) no response—no evidence of cyst healing. For functional assessment we used the modified system of functional evaluation after surgical management of musculoskeletal tumors recommended by Enneking et al. [15]. This system rating takes into account active range of movement (ROM), pain, stability, deformity, strength, functional activity, and emotional acceptance. For statistical analyses, Kruskal–Wallis test was used to compare means among three groups; Chi-square test was used to compare categorical variables.

Results

In our study population of 25 bone cysts, 15 (60 %) were classified as completely healed and nine (36 %) as healed with residual radiolucency. Recurrence was observed in one (4 %) patient. Absence of response to treatment was not observed. Median follow-up was 48 (range 31–91) months. In 18 patients, cyst healing and frame removal was within 4 months; in seven patients, this period was 6 months (Table 1). One recurrence was seen 8 months into the postoperative period. The effect of various variables on Capanna outcome is presented in Table 2. Patient age did not influence treatment outcome. Eight patients were ≤10 years, and cysts healed in all cases; 17 patients were >10 years, recurrence occurred in one patient. Of the ten patients with active cysts, only one experienced recurrence; the 15 patients with latent cysts were healed. Patients with pathological fracture had better outcomes than patients without it. No statistically significant differences in healing time and outcome were noted between closed, half-open, and open treatment. The only recurrence occurred in a patient treated with the half-open method. Functional assessment according to the modified system recommended by Enneking demonstrated excellent functional outcomes in all patients, except one with recurrence, who was rated poor.
Table 2
Effect of various variables on Capanna outcome [n (%)]
Independent variable
Capanna grade
Overallb
1
(n = 16)
2
(n = 8)
3
(n = 1)
(n = 25)
Age groups
 <11
5 (62.5)
3 (37.5)
0 (0.0)
8 (32.0)
 ≥11 and over
11 (64.7)
5 (29.4)
1 (5.9)
17 (68.0)
Type of cyst
 Unicameral
13 (65.0)
6 (30.0)
1 (5.0)
20 (80.0)
 Aneurysmal
2 (40.0)
3 (60.0)
0 (0.0)
5 (20,0)
Activity
 Active
6 (60.0)
3 (30.0)
1 (10.0)
10 (40.0)
 Latent
10 (66.7)
5 (33.3)
0 (0.0)
15 (60.0)
Craniocaudal lengtha (cm)
7.22 ± 1.85
9.31 ± 2.75
11.50
8.06 ± 2.42
Pathologic fracture
 Yes
15 (83.3)
3 (16.7)
0 (0.0)
18 (72.0)
 No
1 (14.3)
5 (71.4)
1 (14.3)
7 (28.0)
Method
 Closed
3 (100.0)
0 (0.0)
0 (0.0)
3 (12.0)
 Half open
4 (44.2)
4 (44.2)
1 (11.2)
9 (36.0)
 Open
9 (69.2)
4 (30.8)
0 (0.0)
13 (52.0)
aMeans and standard deviations
bColumn percentages are shown among the entire group
Three patients had pin-site infection, which was eliminated by orally administered antibiotic therapy, and one patient with a humeral cyst had radial-nerve neurapraxia, which spontaneously healed in 3 months.

Discussion

First facts about distraction osteogenesis appeared in the literature in 1905 and were described by Codivilla [16], who applied the technique to elongate a femur. However, the commonly accepted “father of modern distraction osteogenesis” is G.A. Ilizarov who, in 1951, developed a technique for repairing complex fractures or nonunions of the long bones and, later, started widely applying distraction osteogenesis for treating leg-length discrepancy, nonunion, traumatic bone defects, deformity, and osteomyelitis [17]. Description of this method in managing musculoskeletal tumors has been presented in the reconstruction of diaphyseal defects after excision of tumors and for arthrodesis after joint resection [1820].
Application of distraction osteogenesis for managing bone cysts is pathogenically defensible and, in this study, it was dictated by three main principles of treatment: (1) Destroying the fibrous wall of the cyst and, as a result, eliminating the closed cavity using corticotomy and cooptation. (2) Reducing intracystic pressure by creating an iatrogenic fracture, if absent, and inserting Kirschner wires through the cystic lesion. The role of decreased intracystic pressure was demonstrated by Shinozaki et al. [21], who treated 23 UBCs by drilling multiple holes and inserting Kirschner wires. Overall results of their study showed no recurrences, healing with residual radiolucency in eight patients, and complete healing in 15 patients. Nailing also decompresses the cyst and provides early stability to the bone, with early mobilization and fast recovery to normal activity. Elastic, stable intramedullary nailing for UBC demonstrated good to excellent results in almost all of the 47 UBCs, with long term healing within or during a 36-month period, and complications such as refracture and limb-length discrepancy [7]. In our study, we observed consolidation and cyst healing within 6 months in almost all patients. (3) Filling the pathological cystic cavity with distraction osteogenesis tissue. This step has two main advantages: it requires no auto- or allograft and simultaneously eliminates deformity and limb-length discrepancy.
Approximately 10 % of patients in our study were at risk of growth arrest from a simple bone cyst. The reason for such arrest has not yet been determined and may be the result of a past fracture associated with the cyst, iatrogenic damage that take place as a result of surgical curettage, or of a simple bone cyst abutting the physis and disrupting the process of direct extension of the cyst through the physial plate into the epiphysis. Avoiding curettage from one side and also the possibility of managing bone length resolves the problem of limb shortening. The need for curettage is still under debate.
Some authors uniquely recommend curettage as a mandatory procedure of treatment [8, 22, 23]; others never disturb the cyst wall or its membrane [912, 24]. In our study, we observed no significant differences in healing time and outcome in patients treated with or without curettage. Curettage and bone grafting have been the traditional treatment of UBC. Oppenheim and Galleno [12], in 1984, reported a complication rate of 15 % in 37 patients: infection, coxa vara, epiphyseal arrest, and limb shortening. Furthermore, they found a recurrence rate of 40 %. Long periods of immobilization and difficulties obtaining adequate autograft in children are still essential parts of grafting. Besides economic aspects and availability, allograft remains a problem in some countries. Distraction osteogenesis resolves this problem.
A relatively new direction in orthopedic surgery, such as regenerative medicine, holds great promise for managing bone cysts. Instead of filling the cystic cavity with distraction osteogenesis or autograft or allograft material, trends in research revolve around regenerating damaged tissue, as well as stimulating and enhancing the body’s own repair mechanisms to heal defects and previously irreparable tissues. Great potential using osteoinductive matrix, osteoprogenitor cells, and recombinant growth factors such as bone morphogenic proteins, bone marrow, stem cells, gene therapy, and the combination of cells with biodegradable scaffolds deliver appropriate bioactive factors that may optimize this regenerative process. Krebsbach et al. [25] demonstrated in vivo bone formation after using bone-marrow-derived stem cells loaded on extracellular matrices, such as hydroxyapatite–tricalcium phosphate, applied as a scaffold. Regenerative medicine is shaping these new therapies and promising a future treatment modality for bone defects, being deemed to be and area of demand for future research, with the potential to revolutionize bone-cyst treatment.
More than half of bone cysts are first diagnosed as a pathological fracture [1]. Unlike other methods of treatment, using the method described in this study, we can begin immediate treatment without waiting of fracture healing. Steroid injection remains a widely accepted method of treatment. However, patients had a recurrence rate of 15–88 % after three injections, with limb-length discrepancy being reported in 5–15 % of patients [23, 24].
Recent studies have reported effectiveness and high healing rates with the use of autologous bone marrow and/or demineralized bone matrix percutaneous infiltration. Di Bella et al. [14] compared multiple injections of corticosteroids with a single injection of demineralized bone matrix in association with bone marrow concentrate. They demonstrated advantages of higher healing and lower failure rates. Another study [26] reported better results using a combination injection of steroids, demineralized bone matrix, and bone marrow aspirate in comparison with either injection of steroids or curettage plus bone grafting for UBCs.
Many studies dedicated to managing bone cysts with transosseous osteosynthesis are reported in the Russian Ilizarov Scientific Centre, RISC “RTO” (Kurgan, Russia), where methods such as transverse and longitudinal overlapping, substitution with cortical autografts, etc. were used to restore the cystic cavity. One of the latest studies shows good results (92.3 %) of this treatment in 46 patients with bone cysts [27].
Despite the large number of research treatment modalities, there is still no established procedure that predicts treatment success. Patient age and cystic activity affects recurrence rates. Patients >10 years experience cyst healing at a higher rate (90 %) than those <10 years (60 %), no matter what treatment regimen is utilized [28]. In our study population, all patients <10 years had results rated from good to excellent. We also had only one recurrence, which was in a patient with an active cyst.
This study has several limitations: Despite many common features of UBC and ABC, they are two distinct, nosologic entities and show some differences in clinical behavior. It would be better to evaluate them separately. However, the similar positive results inclined us to publish them together, although we strongly recommend more aggressive treatment, with curettage and open methods for ABC in comparison with UBC. The number of patients was not adequate to conduct many of the statistical analyses, as this treatment method is not widely used. To analyze the impact of various variables on the Capanna outcome, studies with a higher number of patients or meta-analyses of studies like ours could be conducted.
Despite the fact that bone cysts were discovered about 100 years ago, they remain a persistent challenge for the treating physician. Multiple treatment options have recently been presented, but no single treatment has been established as being the best, and there is still no gold standard their management. As simple bone cysts are found in long bones in 90–95 % of patients, and taking into account our achieved positive results in almost all patients in this study, we can recommend distraction osteogenesis as a treatment option. The effectiveness of this method is the low rate of recurrences during the short period of treatment (4–6 months); simultaneous elimination of limb shortening and deformities; in the presence of pathological fracture, the ability to initiate prompt treatment without waiting for the fracture to heal; and return to normal activity in a shorter period. The economic benefits are cyst cavity restoration by the patient’s own body, and avoiding allograft with its associated cost—which remains a problem in some countries.

Conflict of interest

None.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
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Metadaten
Titel
Application of distraction osteogenesis in managing bone cysts
verfasst von
Vagif Verdiyev
Farhad Verdiyev
Publikationsdatum
01.06.2014
Verlag
Springer International Publishing
Erschienen in
Journal of Orthopaedics and Traumatology / Ausgabe 2/2014
Print ISSN: 1590-9921
Elektronische ISSN: 1590-9999
DOI
https://doi.org/10.1007/s10195-013-0272-9

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