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Enchondroma of the Distal Phalanx

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Enchondroma of the Distal Phalanx www.medigraphic.org.mx Acta Ortopédica Mexicana 2011; 25(6): Nov.-Dec: 375-378 Original article Enchondroma of the distal phalanx Fernández-Vázquez JM,* Ayala-Gamboa U,** Camacho-Galindo J,** Sánchez-Arroyo AC*** Centro Médico ABC ABSTRACT. Enchondroma is the most fre- RESUMEN. En los huesos de la mano el encon- quent benign tumor in hand bones. It occasionally droma es el tumor benigno más frecuente. Ocasio- occurs in the distal phalanx of the fi ngers; it is usu- nalmente se presenta en la falange distal de los de- ally an asymptomatic lesion, but pain may occur dos, siendo en la mayoría una lesión asintomática, when it is associated with a fracture. The most rec- pero puede presentarse con dolor cuando se asocia ommended treatment is lesion curettage and appli- a una fractura. El tratamiento más recomendado cation of a bone graft, besides fi xation as needed. es el legrado de la lesión con aplicación de injerto Five cases with location in the distal phalanx are óseo además de la fi jación necesaria. Se informa de reported, as well as treatment results from Janu- 5 casos de localización en la falange distal y los re- ary 1978 to May 2010. Of the 5 patients, 4 were sultados del tratamiento de Enero de 1978 a Mayo females and one was male. The most frequently de 2010. Cuatro de los pacientes son mujeres y 1 affected digit was the middle finger followed by hombre. El dedo más frecuentemente afectado es the little fi nger. The most frequent symptom at the el anular seguido del meñique. El síntoma más fre- time of diagnosis was pain. Lesion curettage was cuente al momento del diagnóstico fue dolor. En performed in all cases, with the use of an autol- todos los casos se realizó legrado de la lesión con ogous distal radius bone graft in 4 and coralline aplicación de injerto óseo autógeno de radio distal graft in one. Mean follow-up was 193 months (2- en 4 y coralina en 1. El seguimiento promedio fue 384 months). No complications or relapses were de 193 meses (2 a 384 meses). No hubo complica- reported. ciones, ni recidivas. Key words: enchondroma, fi nger, hand. Palabras clave: encondroma, dedo, mano. Introduction some of the most frequent sites for enchondromas, account- ing for 54% of cases. They appear between the fi rst and 4th Enchondroma is the primary tumor most frequently re- decades of life. The hands are a frequent site of isolated2 and ported in the long bones of the hand;1 it represents as much multiple lesions (Ollier disease and Maffucci syndrome),3,4 as two thirds of bone lesions. The hand and the wrist are which occur more frequently among males than females.5 The most frequent sites are the proximal and middle pha- lanx, followed by the metacarpals;6,7 they are much less Level of evidence: IV (Act Ortop Mex, 2011) frequent in the distal phalanx.2,8-11 The lesion is commonly asymptomatic and is detected when a fracture occurs or as * Head, Orthopedics Course. 12,13 ** Orthopedic Surgeon. an incidental radiologic fi nding. Distal phalanx enchon- *** Resident. www.medigraphic.org.mxdromas have been reported as unusual lesions (Nakajo et al. 1,4,14,15 Centro Medico ABC 2005). The typical radiographic characteristics of enchondroma Please address all correspondence to: include a well delimited central lucent image in the shaft Dr. Juan Manuel Fernández Vázquez 1,16,17 Consultorio 406. Torre de consultorios Centro Médico ABC Santa Fe. Av. or metaphysis of hand bones (Figures 1 and 2). As the Carlos Graef Fernández Núm. 154. Col. Tlaxala, México, D.F. C.P. 05300 enchondroma grows the cortices become thinner, which Phone: 16 64 71 54 predisposes to fractures (Figure 3).2,18 Occasionally more E-mail: [email protected] sophisticated imaging studies are required to make the di- 1,4,19 Este artículo puede ser consultado en versión completa en http:// agnosis, such as CT or MRI. Takigawa (1971) classi- www.medigraphic.com/actaortopedica fi es the radiographic images of enchondroma in fi ve types: 375 Fernández-Vázquez JM et al. central (58%), eccentric (19%), combined (21%), polycen- Results tric (11%), and giant (3%) (Figure 4). An additional type of radiographic presentation is enchondroma protuberans.20,21 A total of 39 patients were included, 5 of them with loca- The most accepted theory is that enchondromas develop in tion in the distal phalanx (12.8 %). There were four females cartilage fragments originating in the central physis.16 and one male (80% and 20%, respectively), ages 22-41 years The histopathologic appearance of enchondroma is simi- (mean age 31.5 years). The most frequently affected fi nger lar to that of normal cartilage in terms of the amount and was the ring fi nger with 3 cases (60%), followed by the little characteristics of chondrocytes (small nuclei with scarce fi nger, with 2 cases (40%). The most frequent symptom was mitoses), which are spread in hyalin matrix lacunae, with connective tissue septa and calcifi cations resulting in a nod- ular appearance. Often times phalanx enchondromas show a greater mitotic activity, which could suggest malignancy, even though their clinical behavior is benign.18,19 The treatment of solitary lesions depends on the symp- toms, the characteristics of the lesion and the risk of frac- ture. In patients with pain, cortical deformity or risk of frac- ture surgical management is recommended. The proposed treatment consists of curettage of lesions as soon as the di- agnosis is made (Figures 5A and B).19 The recurrence rate of enchondroma after curettage is 2-15%. Material and methods The fi rst author’s records of patients with hand enchon- droma from January 1978 to May 2010 were reviewed and their characteristics were assessed. Specifi c data of patients were analyzed, such as: age, sex, finger involved, symp- toms, clinical presentation, complete X-rays, Takigawa Figure 2. AP and lateral X-ray of a distal phalanx enchondroma. The well classifi cation, description of the surgical technique, compli- delimited, radiolucent lesion is seen, which widens and thickens the antero- cations and fi nal result. posterior diameter of the cortices. Classifi ed by Takigawa as central. www.medigraphic.org.mx Figure 1. AP hand X-ray showing the characteristic image of a distal pha- Figure 3. AP and lateral X-rays of a distal phalanx enchondroma. Solution lanx enchondroma in the ring fi nger. of continuity of the shaft bone tissue is observed associated with the tumor. ACTA ORTOPÉDICA MEXICANA 2011; 25(6): 375-378 376 Enchondroma of the distal phalanx pain, which occurred in all cases, followed by deformity of Discussion the fi nger tip and swelling. In 3 of these cases the cause of pain was fracture of the distal phalanx (60%). In all cases Enchondromas are benign tumor lesions that frequently the diagnosis was made with the case history and AP, lateral appear in the hand. However, distal phalanx lesions are quite and oblique X-rays. The X-rays were classifi ed according rare.1,4,14 In our series the latter represent 12.8% of hand en- to the Takigawa classifi cation in 3 central and 2 eccentric chondromas, which coincides with the frequency reported lesions. Bone curettage of the lesion was performed in all in the literature. The proximal and middle phalanges are the cases. A distal radius autologous bone graft was used in 4 most frequent sites, followed by the metacarpals. Reports cases and a coraline graft in one case. The cases with frac- state that when the lesions are located in the phalanges the ture were stabilized with an intramedullary Kirschner nail to most common radiographic pattern is the central one, which is fi x the fracture line going all the way to the middle phalanx, true for 60% of the cases in our study. Most of our cases with cutting it distally and bending it half a centimeter away from distal phalanx lesions presented with sudden, intense pain as- the pulp. The nail was kept in place for 4-6 weeks until frac- sociated with a fracture. Therefore immediate treatment was ture healing and engraftment occurred. After removing the recommended consisting of curettage of the lesion and place- nail a monoarticular aluminum brace was used to immobi- ment of an autologous bone graft taken from the distal radius lize; hydrotherapy was started at home together with fl exion of the patient through a small window during the same proce- and extension exercises 2-3 times a day until distal interpha- dure or a coraline graft. This bone graft was chosen due to the langeal mobility was recovered. Patients were followed-up proximity of the donor site and because it usually provides from 2 months to 10 years (mean 121 months) and no com- a suffi cient amount of bone. The Kirschner nail used in the plications or relapses were reported. cases with pathologic fracture is used as a protection until Este documento es elaborado por Medigraphic Figure 4. Radiographic classifi cation. Takigawa describes 5 types of radio- graphic patterns for enchondromas depending on the site of the involved Central Eccentric Combined Polycentric Giant bone. www.medigraphic.org.mx Figure 5A. Detail of the fracture site showing the chondral tissue between the proximal and distal fragments of A B the phalanx (arrow). B. Space created in the phalanx after lesion curettage. ACTA ORTOPÉDICA MEXICANA 2011; 25(6): 375-378 377 Fernández-Vázquez JM et al. healing occurs, which in all cases happened between weeks 2. Alawneh I, Giovanini A, Willmen HR, Peters H, Kuhnelt R, Schubert 4 and 6 of treatment.
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