Do Magnets Have the Potential to Serve as a Stabilizer for the Shoulder Joint in Massive Rotator Cuff Tears?: A Biomechanical Cadaveric Study

Background@#Disruption of the rotator cuff muscles compromises concavity compression force, which leads to superior migration of the humeral head and loss of stability. A novel idea of using the magnetic force to achieve shoulder stabilization in massive rotator cuff tears (MRCTs) was considered because the magnets can stabilize two separate entities with an attraction force. This study aimed to investigate the biomechanical effect of the magnetic force on shoulder stabilization in MRCTs. @*Methods@#Seven fresh frozen cadaveric specimens were used with a customized shoulder testing system. Three testing conditions were set up: condition 1, intact rotator cuff without magnets; condition 2, an MRCT without magnets; condition 3, an MRCT with magnets. For each condition, anterior-posterior translation, superior translation, superior migration, and subacromial contact pressure were measured at 0°, 30°, and 60° of abduction. The abduction capability of condition 2 was compared with that of condition 3. @*Results@#The anterior-posterior and superior translations increased in condition 2; however, they decreased compared to condition 2 when the magnets were applied (condition 3) in multiple test positions and loadings (p <0.05). Abduction capability improved significantly in condition 3 compared with that in condition 2, even for less deltoid loading (p < 0.05). @*Conclusions@#The magnet biomechanically played a positive role in stabilizing the shoulder joint and enabled abduction with less deltoid force in MRCTs. However, to ensure that the magnet is clinically applicable as a stabilizer for the shoulder joint, it is necessary to thoroughly verify its safety in the human body and to conduct further research on technical challenges.

Results of Hip Arthroplasty Using a COREN Stem at a Minimum of Ten Years / 대한고관절학회지

Purpose@#We report on the 10-year clinical hip function and radiologic outcomes of patients who underwent hip arthroplasty using a COREN stem. @*Materials and Methods@#A consecutive series of 224 primary cementless hip arthroplasty implantations were performed using a COREN stem between 2009 and 2011; among these, evaluation of 128 hips was performed during a minimum follow-up period of 10 years. The mean age of patients was 65.4 years (range, 40-82 years) and the mean duration of follow-up was 10.8 years (range, 10-12 years). Evaluation of clinical hip function and radiologic implant outcomes was performed according to clinical score, thigh pain, and radiologic analysis. @*Results@#Dramatic improvement of the mean Harris hip score (HHS) from 59.4 preoperatively to 93.5 was observed at the final follow-up (P≤0.01). Stable fixation was demonstrated for all implants with no change in position except for one case of Vancouver type B2 periprosthetic femur fracture. A radiolucent line (RLL) was observed in 16 hips (12.5%). Thigh pain was observed in only two hips (1.6%) at the final follow-up. There were no cases of osteolysis around the stem. The survival rate for the COREN stem was 97.7%. @*Conclusion@#Good long-term survival with excellent clinical and radiological outcomes can be achieved using the COREN femoral stem regardless of Dorr type.

Long-Term Clinical Outcome of Two Stage Revision Surgery for Infected Hip Arthroplasty Using Cement Spacer / 대한정형외과학회잡지

PURPOSE: We retrospectively analyzed long-term clinical results after two-stage revision arthroplasty using an antibiotic-impregnated cement spacer for infected total hip arthroplasty. MATERIALS AND METHODS: Twenty-six hips (group 1: cup exchanged, group 2: cup and stem exchanged) were enrolled in this study. The mean follow-up period was 7.4 years (5 to 11 years). We analyzed the laboratory findings, the time interval between antibiotic-impregnated cement spacer insertion and revision arthroplasty, Harris hip score, Oxford hip score, radiologic changes, and recurrence of infection. RESULTS: Revision hip arthroplasty was performed at 7.5 weeks on average (group 1: 7.2 weeks, group 2: 7.7 weeks) after implant removal and cement spacer insertion. In group 1, Harris hip score was 51.1 points preoperatively, 84.4 points at six months, 89.3 points in at one year, 91.8 points at three years, and 89.8 points at five years. In group 2, the Harris hip score was 49.8 points preoperatively, 78.1 points at six months, 83.7 points at one year, 90.3 points at three years, and 88.7 points at five years. Recurrence of infection developed in one hip in each group. CONCLUSION: Ninety-two percent of infected hips were eradicated with two-stage revision arthroplasty using an antibiotic-impregnated cement spacer for infected hip arthroplasty at minimum five-year follow-up. When the infection was limited to the hip joint and the stem was fixed well, two-stage revision with stem retained could be a good treatment option.

Musculocutaneous Nerve Entrapment after Biceps Long Head Tendon Rupture / 대한정형외과학회잡지

Biceps long head tendon rupture is relatively common and requires approximately four weeks of splintage as a general treatment. Musculocutaneous nerve entrapment is commonly caused by excessive exercise or direct external force. Musculocutaneous nerve syndrome has barely been reported; however, association of biceps long head tendon rupture and musculocutaneous nerve entrapment syndrome has never been reported. The authors experienced a 70-year-old male patient, who suffered a traffic accident and was hospitalized due to shoulder joint pain caused by direct external force, delayed forearm lateral aspect hypoesthesia and elbow flexion weakness. For identification of the cause, magnetic resonance imaging, electromyography, and surgical opinion were synthesized, resulting in diagnosis of delayed musculocutaneous nerve entrapment syndrome occurring after biceps long head tendon rupture. With surgical treatment, pain, sense, and elbow flexion weakness were recovered, a showing successful treatment result.

Clinical Characteristics of Methicillin-resistant Staphylococcus aureus Infection for Chronic Periprosthetic Hip and Knee Infection / 대한고관절학회지

PURPOSE: Deep infection after hip and knee arthroplasty is a serious complication and is difficult to treat due to its toxicity. The aims of our study were to find out the differences of methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-sensitive Staphylococcus aureus (MSSA) infection after hip and knee arthroplasty focusing on clinical course and laboratory findings. MATERIALS AND METHODS: We retrospectively reviewed 61 staphylococcal infection cases after hip and knee arthroplasty (MSSA in 25 patients, MRSA in 36 patients). Vital signs, laboratory tests, microbiology and clinical courses were analyzed. The average follow-up period was 3.8 years (range, 2 to 10.1 years). RESULTS: At initial visit, MRSA group showed significant higher erythrocyte sedimentation rate, C-reactive protein (CRP) and neutrophil percentage. The average duration for the normalization of CRP was longer in MRSA group (MRSA: 36.7+/-25.1 days, MSSA: 24.7+/-13.6 days; P=0.008). The mean interval between staging operation was longer in MRSA group (MRSA: mean 8.7 weeks [range, 6.4 to 21.4 weeks], MSSA: mean 6.8 weeks [range, 6 to 13.1 weeks]; P=0.012). MRSA group (13.9%) revealed higher recurrence rate than MSSA group (4%). Two patients (5.6%) from MRSA group expired by sepsis. One limb amputation (2.7%) was carried out in MRSA group. CONCLUSION: MRSA infection after arthroplasty showed more toxic serologic parameter and poorer prognosis. Aggressive treatment should be considered for MRSA infection following arthroplasty.

Clinical Results of Auto-Iliac Cancellous Bone Grafts Combined with Implantation of Autologous Bone Marrow Cells for Osteonecrosis of the Femoral Head: A Minimum 5-Year Follow-Up

PURPOSE: There are no reports about bone graft and cell therapy for the osteonecrosis of femoral head (ONFH). We prospectively evaluated the clinical results of auto-iliac cancellous bone grafts combined with implantation of autologous bone marrow cells for ONFH. MATERIALS AND METHODS: Sixty-one hips in 52 patients with ONFH treated with bone graft and cell therapy were enrolled, and the average follow-up of the patients was 68 (60-88) months. Necrotic lesions were classified according to their size by the Steinberg method and location of necrosis. RESULTS: At the last follow-up, the percentage of excellent or good results was 80% (12/15 hips) in the small lesion group, 65% (17/26 hips) in the medium size group, and 28% (6/20 hips) in the large size group. The procedures were a clinical success in 4 of 5 hips (80%) of stage I, 23 of 35 hips (65.7%) of stage II, 7 of 18 hips (38.9%) of stage III, and 1 of 3 hips (33.3%) of stage IV grade, according to the Association Research Circulation Osseous grading system. Among the 20 cases with large sized necrotic lesions, 17 cases were laterally located and this group showed the worst outcomes, with 13 hips (76.5%) having bad or failed clinical results. CONCLUSION: The results of the present study suggested that patients who have a large sized lesion or medium sized laterally located lesion would not be good candidates for the head preserving procedure. However, for medium sized lesions, this procedure generated clinical results comparable to those of other head preserving procedures.

A Case of Herpes Zoster Duplex Bilateralis, a Diagnostic Clue of Human Immunodeficiency Virus Infection / 대한피부과학회지

The skin lesion of herpes zoster is typically limited to a single dermatome. The clinical appearance of herpes zoster in immunocompromised patients is usually identical to typical zoster, but lesions may be more severe and there can be multidermatomal involvement. The appearance of herpes zoster occurring in two non-contiguous dermatomes has been referred to as zoster duplex unilateralis or bilateralis. Herpes zoster duplex bilateralis is a rare manifestation of herpes zoster and almost all reported cases have in immunocompromised patients with hematologic cancer, patients taking immunosuppressant drugs for chronic illnesses and patients receiving chemotherapy for solid cancers. We report a case of herpes zoster duplex bilateralis, which was a diagnostic clue of human immunodeficiency virus infection.

A Case of Mycobacterium fortuitum Infection at the Site of Acupuncture / 대한피부과학회지

Mycobacterial infections that are transmitted by acupuncture are an emerging problem. M. fortuitum is one of the rapid-growing atypical mycobacteria and this infection usually follows a puncture wound or a surgical procedure. We report here on a case of M. fortuitum infection following an acupuncture procedure. A 37-year-old woman presented with indurations and ulcerations of both popliteal fossae after undergoing acupuncture. The skin biopsy specimen showed suppurative inflammation with a lymphocytic infiltration, and the Ziehl-Neelsen stain for AFB was negative. Bacterial culture of the tissue fluid was negative. The culture of the tissue specimen and polymerase chain reaction revealed M. fortuitum. The infection responded to 10 weeks of treatment with isoniazid, rifampin and ethambutol, and four months of treatment with rifampin. Despite of the increasing popularity of acupuncture, the importance of infection control has not been adequately emphasized in oriental medicine. Education for proper infection control, including aseptic practice, is necessary for oriental medical doctors and practitioners.

A Case of Erosive Pustular Dermatosis of the Scalp / 대한피부과학회지

Erosive pustular dermatosis of the scalp is a rare disorder of the elderly and it is characterized by pustular, erosive and crusted lesions of the scalp with progressive scarring alopecia. The predisposing factors have been reported to be trauma, including mechanical trauma, skin grafting, surgery and prolonged exposure of a bald scalp to UV light. Yet the laboratory data, the bacteriological and mycological investigations and the histopathologic findings of the previously reported cases were generally negative and not diagnostic. We herein present a case of erosive pustular dermatosis of the scalp that occurred after mechanical trauma on the previous skin graft site. This type of case has not been previously reported in the Korean dermatologic literature.

A Case of Osteoma Cutis, a Diagnostic Clue for Albright's Hereditary Osteodystrophy / 대한피부과학회지

Albright's hereditary osteodystrophy (AHO) has a broad spectrum of physical findings, including short stature, flattened nasal bridge, round facies, obesity, skeletal anomalies of the hands with brachydactyly, osteoma cutis, mental retardation, dental defects, cataracts, and calcification in the basal ganglia. It also includes endocrinologic abnormalities such as pseudohypoparathyroidism and pseudopseudohypoparathyroidism. Primary osteoma cutis, which can precede other physical findings of AHO, might be a diagnostic clue for AHO. Therefore, close follow-up and regular laboratory tests should be done to detect the early development of AHO in young children with primary osteoma cutis. Early diagnosis and treatment of AHO can prevent irreversible mental retardation and developmental delay.

A Case of Myxoid Neurothekeoma on the Hand / 대한피부과학회지

Neurothekeoma is a benign dermal soft tissue tumor that is probably of nerve sheath origin. It usually presents as a slow-growing, solitary papule or nodule that is mainly located on the head and neck or upper extremities except for the hand. There are three histologic subtypes - myxoid, mixed and cellular type - depending on the amount of myxoid stroma. Immunohistochemical markers such as S-100, glial fibrillary acidic protein, nerve growth factor receptor, NK1C3 (CD57) and Ki-M1p can be applied to the tumor cells to distinguish among thesethree subtypes of neurothekeoma. Only one case has been previously reported on the hand in Korea. Herein, we report a rare case of myxoid neurothekeoma on the hand with a review of the related literature.

A Case of Bart's Syndrome / 대한피부과학회지

Aplasia cutis congenita is a rare congenital skin defect that presents with sharply outlined ulcerations. The most common site of this disease is the scalp, yet when other areas of the body are involved, there is higher incidence of concomitant congenital diseases or malformations. Bart's syndrome is a rare inherited condition with congenital skin defects that are associated with epidermolysis bullosa. An infant presented with congenital skin defects on the leg, and the infant had recurrent bullous skin lesions on the both hands, feet, wrists and ankles. The skin defect caused only small scar formation and no handicap regarding function and appearance, yet continuously new bullous lesion developed and healed on the both distal extremities. He was diagnosed as suffering with epidermolysis bullosa with the histological findings of epidermal cleavage and negative direct immunofluorescence findings. Herein, we report on a case of Bart's syndrome that displayed aplasia cutis congenita over the lower extremities and skin blistering.

Two Cases of Nevoid Basal Cell CarcinomaSyndrome in One Family

The nevoid basal cell carcinoma syndrome, or Gorlin-Goltz syndrome, is an autosomal dominant multiple system disorder with high penetrance and variable expressions, although it can also arise spontaneously. The diagnostic criteria for nevoid basal cell carcinoma syndrome include multiple basal cell carcinomas, palmoplantar pits, multiple odontogenic keratocysts, skeletal anomalies, positive family history, ectopic calcification and neurological anomalies. We report a brother and sister who were both diagnosed with nevoid basal cell carcinoma syndrome.

Generalized Eczema-like Eruption in a Patient Treated with Interferon Alpha-2b and Ribavirin for Chronic Hepatitis C / 대한피부과학회지

The combination of interferon alpha with ribavirin is currently recommended in the treatment of hepatitis C virus (HCV) infection. Commonly reported cutaneous reactions include localized reactions such as injection site inflammation and necrosis and worsening of other skin disorders, including psoriasis, lichen planus, vitiligo, or systemic lupus erythematosus. However, generalized eczematous reactions have been reported to occur uncommonly in patients treated with interferon and ribavirin, however such a case has not been described in the Korean literature. Herein, we describe a 49-year old female showing generalized eczema-like eruption after treatment of interferon alpha-2b and ribavirin for chronic HCV infection.

Clinicopathologic Comparison of Genital and Extragenital Lichen Sclerosus et Atrophicus / 대한피부과학회지

BACKGROUND: Lichen sclerosus et atrophicus is a persistent inflammatory dermatosis of unknown etiology with a predilection for the genital area. Although there were many case reports in Korea, there are no studies regarding the clinicopathologic comparison of genital and extragenital lichen sclerosus et atrophicus. OBJECTIVE: The aim of our study was to evaluate the clinicopathologic characteristics and differences between genital and extragenital lichen sclerosus et atrophicus. METHODS: Retrospective analysis was performed by reviewing the clinicopatholgic records of 33 patients who were diagnosed with lichen sclerosus et atrophicus from 2000 to 2006 in Yonsei University Severance Hospital. RESULTS: The most common clinical manifestation is a whitish patch with pruritus on labia minor. The ratio of male to female patients in genital and extragenital lichen sclerosus et atrophicus were 1:10.5 and 1:2.3 respectively. Disease onset ages were 49.9 years and 44.2 years respectively. The most common subjective symptom was pruritus. However, no symptom was more significant in extragenital lichen sclerosus et atrophicus compared to genital lichen sclerosus et atrophicus. Most of the lesions presented as whitish patches and plaques but atrophy, erythema and lichenification could also occur. Histopathologic findings of the extragenital lichen sclerosus et atrophicus showed more significant epidermal thinning and cleft formation compared to genital lichen sclerosus et atrophicus, which suggests that extragenital lichen sclerosus et atrophicus shows more evolved lesions. A few cases of genital lichen sclerosus et atrophicus showed spongiotic dermatitis, lichen simplex chronicus-like and lichen planus-like features in addition to typical pathology, which were suspected as secondary features or early lesions. All the patients were treated with high to mid-potency topical corticosteroid which were effective in both the genital and extragenital lichen sclerosus et atrophicus. There was no cases of squamous cell carcinoma arising in lichen sclerosus et atrophicus during the follow-up. CONCLUSION: Clinically, there were no symptoms significant to extragenital lichen sclerosus et atrophicus and pathologically extragenital lichen sclerosus et atrophicus showed more significant epidermal thinning and cleft formation. Further research regarding the characteristics and differences between genital and extragenital lichen sclerosus et atrophicus should be performed on larger number of cases.

A Case of Linear IgA Bullous Dermatosis Probably Caused by Captopril / 대한피부과학회지

Linear IgA bullous dermatosis (LABD) is a rare autoimmune subepidermal bullous disease characterized by a linear pattern of IgA deposition along the basement membrane zone. The etiology of LABD is unknown but a minority of cases are drug-induced. Although vancomycin is the agent most commonly implicated in the pathogenesis of drug-induced LABD, association with other agents including phenytoin, piroxicam, captopril, diclofenac sodium and cyclosporine have also been reported. We describe a case of linear IgA bullous dermatosis which probably developed after captopril treatment in a 51-year-old male patient with infective endocarditis.