[Replantation of extracorporeally devitalized bone segments for defect reconstruction in tumor orthopedics--an overview]

PURPOSE

The purpose of this paper is a review of the actual data about biological reconstruction by means of reimplantation of devitalised tumour bearing bone segments.

REVIEW OF THE LITERATURE

Both experimental and clinical investigations proved extracorporeal autoclaving or high-dose irradiation to be a secure method for killing tumour cells. Animal experiments demonstrated that incorporation of devitalised bone segments took place after intramedullary nailing as well as after plate osteosynthesis. Bony union was followed by a slow revitalisation of the bone is reduced only after extremely high-dose irradiation. Autoclaving, however, may essentially impair biomechanics already after a short time of application high temperatures. The analysis of 115 patients with autoclaved re-implants and of 42 patients with irradiated reimplants showed encouraging functional long-term results when comparing to other biological reconstruction techniques. The time until consolidation was about 3 times longer than after osteotomies with well vascularised fragments on both sides. According to the data of the literature, the rate of local recurrences, fractures or deep infections was not higher than after other limb salvage procedures.

CONCLUSION

Re-implantation of extracorporeally devitalised tumour bearing bone segments may be an excellent alternative reconstructive procedure in limb salvage for a small number of well selected patients. Stringent indication is most important for good results. Only patients who are willing and able for the differentiated aftertreatment should be considered and tumours with osteolyses essentially compromising stability should be excluded. Apart from general oncological necessities like adequate surgical margins, biomechanically correct osteosynthesis is most important in this alternative of reconstruction.

Survival analysis of the Harris-Galante I acetabular cup

We reviewed 264 consecutive primary total hip replacements in 244 patients in which the Harris-Galante I porous-coated acetabular component had been used. The mean follow-up was 95 months (69 to 132). In 221 arthroplasties a 32 mm ceramic head had been used, and in the other 43 one of cobalt-chrome alloy. There were 124 women and 120 men with a mean age at operation of 56.8 years (21 to 83). Survival analysis of the acetabular components was performed using the following definitions of failure: 1) infection; 2) removal because of aseptic loosening; 3) removal for any cause; and 4) a worst-case analysis including removal of the cup or infection or loss to follow-up. Two well-fixed cups had been removed because of deep infection and three, similarly sound cups had been exchanged at the time of femoral revision. None of the acetabular components had required revision for aseptic loosening. After 11 years survival was 97.7% using the worst-case criterion. Radiological analysis of 187 acetabular components at a mean of 82 months (41 to 132) revealed no case of aseptic loosening. Pelvic osteolysis was seen in only one patient, but was not progressive and showed signs of regression. The results using these acetabular components are encouraging but the need for regular follow-up remains since complications such as significant wear of the liner, massive osteolysis of the pelvis, aseptic loosening and late infection may increase in the second decade.

Survival analysis of the Harris-Galante I acetabular cup

We reviewed 264 consecutive primary total hip replacements in 244 patients in which the Harris-Galante I porous-coated acetabular component had been used. The mean follow-up was 95 months (69 to 132). In 221 arthroplasties a 32 mm ceramic head had been used, and in the other 43 one of cobalt-chrome alloy. There were 124 women and 120 men with a mean age at operation of 56.8 years (21 to 83).

Survival analysis of the acetabular components was performed using the following definitions of failure: 1) infection; 2) removal because of aseptic loosening; 3) removal for any cause; and 4) a worst-case analysis including removal of the cup or infection or loss to follow-up.

Two well-fixed cups had been removed because of deep infection and three, similarly sound cups had been exchanged at the time of femoral revision. None of the acetabular components had required revision for aseptic loosening. After 11 years survival was 97.7% using the worst-case criterion. Radiological analysis of 187 acetabular components at a mean of 82 months (41 to 132) revealed no case of aseptic loosening. Pelvic osteolysis was seen in only one patient, but was not progressive and showed signs of regression.

The results using these acetabular components are encouraging but the need for regular follow-up remains since complications such as significant wear of the liner, massive osteolysis of the pelvis, aseptic loosening and late infection may increase in the second decade.

Is there a future for hinged prostheses in primary total knee arthroplasty? A 20-year survivorship analysis of the Blauth prosthesis

The Blauth prosthesis is a hinged total knee replacement. We have evaluated 422 consecutive primary total knee arthroplasties using this design in 330 patients with a maximum follow-up of 20 years (mean 6). The mean age of the patients at the time of operation was 70 years (29 to 87). Using endpoints of infection, removal because of aseptic loosening, removal for any cause, and the worst case as definitions of failure, the cumulative rates of survival at 20 years were 93.6%, 96.0%, 94.4% and 86.8%, respectively. The cumulative rate of survival of the patients themselves was 14.4% (24% in patients with osteoarthritis and 9% in these with rheumatoid arthritis) after 20 years. Our survivorship analysis shows that hinged knee prostheses, when they are biomechanically well designed, can yield a satisfactory long-term outcome, similar to those of the best prostheses of the resurfacing type. Hinged knee prostheses continue to be of value in patients with severe deformity or instability of the knee.

Is there a future for hinged prostheses in primary total knee arthroplasty?

The Blauth prosthesis is a hinged total knee replacement. We have evaluated 422 consecutive primary total knee arthroplasties using this design in 330 patients with a maximum follow-up of 20 years (mean 6). The mean age of the patients at the time of operation was 70 years (29 to 87).

Using endpoints of infection, removal because of aseptic loosening, removal for any cause, and the worst case as definitions of failure, the cumulative rates of survival at 20 years were 93.6%, 96.0%, 94.4% and 86.8%, respectively. The cumulative rate of survival of the patients themselves was 14.4% (24% in patients with osteoarthritis and 9% in these with rheumatoid arthritis) after 20 years.

Our survivorship analysis shows that hinged knee prostheses, when they are biomechanically well designed, can yield a satisfactory long-term outcome, similar to those of the best prostheses of the resurfacing type. Hinged knee prostheses continue to be of value in patients with severe deformity or instability of the knee.

Incorporation of devitalised autografts in dogs

Segments of the tibial diaphysis from 24 adult dogs were reimplanted after extracorporeal autoclaving or gamma-irradiation. Fixation was by interlocking intramedullary nailing, or plating. The dogs were killed after 36 weeks and the tibias examined. Bony union was seen in 46 of the 48 contact areas. Microangiography and Tc-perfusion scans demonstrated complete revascularisation of all the grafts. Biomechanical tests showed defective union with increased bending and decreased stiffness compared to normal controls. Fluorescent microscopy confirmed restitution of Haversian systems and slow replacement of the graft by lamellar bone containing viable osteocytes.

[Blood sugar control in children and young diabetics during an educational summer camp]

The aim of the study was to evaluate the impact of educative summer camp on the glycemic control in two different age-groups of young diabetic patients.

METHODS

54 patients (36 M, 18 F, age 10-27 years, duration of diabetes 2-19 years), treated with 0.81 +/- 0.2 UI/kg/day of insulin and with HbA1c mean levels of 8.25 +/- 1.35 g% were followed by an equip of 8 medical doctors, 4 nurses and 1 dietician for a week during an educative summer camp.

RESULTS

34 children, group 1 (20 M, 14 F, 10-14 years aged, mean duration of the disease 4.52 years, range 2-12 years) and 20 young adults, group 2 (16 M, 4 F, age 16-27 years, mean duration 10.21 years, range 2-19 years) were evaluated. Insulin doses and HbA1c levels were 0.82 +/- 0.21 UI/kg/day vs 0.80 +/- 0.22 U/kg/day and 9.54 +/- 1.5% vs 7.6 +/- 0.6%, p < 0.02 in group 1 and 2 respectively. Glycemic levels at 8 a.m. and 11 p.m. were significantly higher in group 1 than in group 2 (180 +/- 87 mg% vs 219 +/- 77 mg%, p < 0.05 and 164 +/- 84 mg% vs 201 +/- 81 mg%, p < 0.05). Hypoglycemic/patient/episodes were 1.82 vs 0.72, p < 0.05 in group 1 and group 2 respectively.

CONCLUSIONS

1. Glycemic control was unsatisfactory in both groups and it was significantly worse in the group of youngs, though in this group HbA1c level was significantly lower. 2. The risk of hypoglycemia was significantly higher in group 1, though in this group insulin doses were significantly decreased.

[Laser therapy of age-related exudative macular degeneration]

Aim of the study is to determine the percent of cases with exsudative form of age related macular degeneration that are eligible for treatment by the Macular Photocoagulation Study guidelines after initial visit. Authors also evaluated efficacy of focal laser treatment in visual acuity. In a group of 80 eyes in 55 patients only in 13 (16%) eyes was found classic choroidal neovascular membrane and 12 (15%) of them met eligibility criteria for treatment by the MPS criteria. 6 CNV (46%) were treated with argon-green laser according to MPS photocoagulation criteria. Visual acuity of treated eyes was improved in 2 eyes, unchanged in 1 eye and worsened in 3 eyes. For worse visual outcomes were responsible recurrent CNV which occurred in 3 (50%) of treated eyes.

Malignant transformation of a multiple cartilaginous exostosis--a case report

A patient is reported who had multiple cartilaginous exostoses with malignant transformation of a pelvic osteochondroma.

[Treatment of osteoid osteoma with CT-guided drilling and ethanol instillation]

HISTORY AND CLINICAL FINDINGS

For 6 months a 25-year-old man had been suffering from intermittent pain in the left upper leg, alleviated by aspirin. Physical examination was unremarkable: local pain was not elicited.

INVESTIGATIONS

Routine radiology and computed tomography confirmed the clinically suspected diagnosis of intracortical osteoid osteoma of the femur. Skeletal scintigraphy showed distinctive local concentration of the contrast material. DIAGNOSTIC PROCEDURE, TREATMENT AND COURSE: The lesion's central area was identified by CT and under general anaesthesia drilled into (5 mm diameter drill bit). As the lesion's edges remained partially intact, the cavity was sterilized with 1-2 ml of 96% ethanol. The patient was mobilized after six hours. He has remained free of pain in the subsequent 7 months.

CONCLUSIONS

Minimally invasive, CT-guided percutaneous treatment of an osteoid osteoma can be achieved by a combined radiological and percutaneous orthopaedic procedure as an alternative to open surgery.

[Shortened version of the Barcelona test (III): criterion validity with the ADAS-Cog]

The aim of this study was to assess the criterion validity of a global score of an abbreviated version of the Barcelona Test (BTA), normalized for age and education, as a clinical neuropsychometric test for the assessment of cognitive impairment. This study made a correlational analysis between test scores of the BTA and scores of the cognitive part of the Alzheimer's Disease Assessment Scale (ADAS-Cog) adjusted for age and education. It was made in a University Hospital (Dementia Unit). A group of 172 subjects (74 male, 98 female) was distributed according the Global Deterioration Stages (GDS) from 1 to 6. GDS-1 (normal controls), n = 60; GDS-2 (subjective complaints), n = 27; GDS-3, n = 21, GDS-4, n = 22; GDS-5, n = 16; GDS 6, n = 26. All dementia patients fulfilled the NINCDS/ADRDA criteria. BTA global scores correlated significantly with adjusted scores on the ADAS-Cog (r = 0.872, r2 = 0.761), p < 0.0001. The BTA has a criterion validity as a clinical neuropsychometric test for the study of cognitive impairment.

[Shortened version of the Barcelona test (II): global standard score]

The aim of this study was to determine a global scoring method for a shortened and version of the Barcelona Neuropsychological test (TB) of 55 items. 341 healthy volunteers, 178 male (52.19%), and 163 female (47.1%) were studied. Age mean: 54.80, SD = 17.44. Subjects were stratified in five groups considering age and education. A scale of cut-off points was selected in order to divide the scores of each subtest into three bands (categories): 0 (lowest), 1 (intermediate), 2 (highest). Raw scores (possible range 0-110) were obtained and then were converted to a mean of 100 and SD of 15 each normative group. Tables of normative data were obtained for each group. This study shows the cognitive profiles of the TB and a global standard score related to them. This global score will provide new possibilities in the neuropsychological assessment of neurological patients.

Desmoplastic fibroma of the bone. A report of two patients, review of the literature, and therapeutic implications

BACKGROUND

Desmoplastic fibroma (DF) is an extremely rare bone tumor. The recommendations for therapy are often based on limited personal experience, and the rate of local recurrence in the published cases is very high. Therefore, an analysis of treatment results of published cases was performed. Furthermore, DNA analysis of the tumors from two patients was also performed.

METHODS

The clinical, radiologic, and histologic data of two patients with DF of the long bones are presented. DNA flow cytometry was performed on both DFs, three cases of abdominal fibromatosis, and three cases of extraabdominal fibromatosis. One hundred eighty-nine patients analyzed in the literature and our own 2 patients were evaluated with regard to epidemiologic, clinical, and histologic data, with particular emphasis on treatment results.

RESULTS

DNA analysis of the locally infiltrating tumors revealed indices of proliferation between 21.5% and 24%, noticeably elevated values in comparison with extraosseous desmoid tumors (8.04%). Magnetic resonance imaging (MRI) was most valuable for imaging the intraosseous and extraosseous extent of DF. The evaluation of 191 patients (189 from the literature, 2 of the authors) showed the numbers of males and females to be equivalent, with a mean age of 23 years. DF has been reported in almost all bones, with a tendency to occur in the mandible and the long bones. Approximately 12% of patients presented with a pathologic fracture (20 of 161 patients). Infiltrative growth in the soft tissue was documented in 48% of patients. Three patients developed metastases after local recurrence. Analyzing the treatment results, the authors found a recurrence rate of 55-72% after nonresection procedures, and 17% after resection. No recurrences are reported after resection with wide surgical margins. The recurrence rate of tumors of the extremities was 55%, and 25% of these patients eventually required an amputation.

CONCLUSIONS

Considering the "semimalignant" character of this entity and the poor treatment results in patients with recurrent tumors, marginal or wide resection for primary treatment is recommended. The superior imaging quality of MRI greatly facilitates preoperative planning.

The Wagner revision stem in alloarthroplasty of the hip

Forty-one Wagner revision stems were implanted at the Orthopedic Department of the University of Tübingen between July 1990 and January 1993. We report the results of 37 patients at an average follow-up of 27 months (13-48 months) postoperatively. The main indication was stem loosening with considerable loss of bone. In addition, we used the implant 4 times in primary arthroplasty. At follow-up examination 33 patients (89%) were satisfied with the postoperative outcome. According to the Merle D'Aubigné score (12-point scale), 32 patients showed a poor functional result of less than 6 points preoperatively. Postoperatively, the results of 36 patients could be classified as very good to good. To categorise the radiological destruction of the implant bed, we used the femoral shaft defect classification of the DGOT (Deutsche Gesellschaft für Orthopädie und Traumatologie) in conjunction with the classification of Pak and Paproski [5, 11]. Twenty patients presented with trochanteric and calcar defects, and 11 patients with a combination of a calcar and shaft defect. We found a circular shaft defect in 2 patients. In 7 cases we assessed the bone remodelling postoperatively as very good, with strong newly formed bone structures, and in 25 cases as good, with remodelling of the old stem bed and bony structuring of the osteolyses. A secondary sinking in of the Wagner stem was seen in 7 cases. Only one stem had to be revised because of pain symptoms and loosening; in all other cases a secondary stabilisation of the revision-stem took place. With the Wagner revision stem, there is the possibility of achieving mechanical stability even in situations with massive bone loss. The evacuation of bone cement and granulation tissues is facilitated by the transfemoral approach, bony remodelling is accelerated, and bone grafting is often not necessary. As our short-term results show, the concept is a promising one. Nevertheless, we will be very careful in following these patients in the long term, as we have noticed stem sinkage in a small percentage of cases.

[Evaluation system in assessing radiological examinations of clinical significance for the patient]

PURPOSE

The purpose of this study was to test a scoring system and its utility for the assessment of the clinical significance of radiological examinations.

MATERIAL AND METHODS

The reports of all diagnostic studies obtained in patients with a clinical suspicion of pancreatitis, urinary tract obstruction, biliary or gallbladder diseases, ileus and gastrointestinal perforation were scored prospectively in 4 categories from 0 to 3. These categories were related to the ability to establish a definite diagnosis, to exclude suspected disease, to influence further diagnostic work-up and therapeutic decision-making.

RESULTS

This scoring system showed significant differences of the efficacy of different imaging modalities in these 5 clinical settings.

CONCLUSION

This scoring system was helpful to determine the clinical significance of radiological examinations.

[Biomechanics of healing of cortical autotransplants after intramedullary nailing and device removal]

The aim of the study was to investigate the biomechanical properties of segmental cortical autografts subjected to extracorporeal treatment. For this purpose, 12 beagle dogs were submitted to tibial osteotomy, when 25 mm-long diaphyseal segments of bone were removed and treated outside the body by autoclaving or gamma radiation (Co, 5 kGy). Subsequently, osteosynthesis involving the use of medullary nailing was performed. After 36 weeks, the dogs were killed painlessly and, after removing the nails, the tibias were tested for the biomechanical properties. In comparison with the contralateral tibia, a mean stiffness of 47% and 32% was measured for tibia treated by irradiation and autoclaving, respectively, while bending showed an increase of up to 590%. These results show the need to allow plenty of time for healing in the case of weightbearing transplants. When bealing is undisturbed, no biomechanical differences are found between proximal and distal osteotomies, although in the X-ray image the osteotomy gap (fracture line) remains visible, and scintigraphic activity persists for a longer period. This means that the radiological aspect of the former does not necessarily reflect actual biomechanical strength.

Intraosseous temperature during autoclaving

One method of reconstruction in limb salvage surgery for bone tumours is wide resection, extracorporeal devitalisation of the excised segment by autoclaving, and reimplantation of the segment. We have studied the changes in temperature in the medullary cavity, the head, the medial condyle and lateral condyle of calf femora during autoclaving at 134 degrees C in two different autoclaves. There were impressive differences of temperature at different sites. The most unfavourable position was the lateral condyle, which consists mainly of cancellous bone: a short programme of 11 minutes produced a lowest temperature in the series of only 45 degrees C, which may not be sufficient to kill all tumour cells.

[Double-contrast arthro-CT in diagnosis of shoulder instability]

Timeless and lesion-related treatment are important in the different shoulder instabilities in order to get a good functional result. Within the step-by-step programme of diagnostic possibilities the double contrast computerised arthrotomography is particularly indicated in recurrent posttraumatic and habitual dislocations, in subluxations as well as for clarification of causes of postoperative recurrence. Besides the documentation of skeletal changes (Hill-Sachs-lesion, Bankart defect), double-contrast arthro-CT offers the possibility to identify detachments of the joint capsule or labral tears. Between 11/90 and 9/93 we performed 38 double contrast arthro-CTs for recurrent shoulder instabilities. 35 men and 3 women were examined. The mean age of the sportive patients were 29 years. Preoperatively we diagnosed in 21 cases a recurrent posttraumatic, in 7 cases a habitual shoulder instability. Apart from one multidirectional and three posterior instabilities we found two cases of subluxation. In the meantime 24 patients were treated with an open stabilising operation of the shoulder. The operative findings were compared with the results of double contrast arthro-CT. In a total of 38 performed arthro-CTs we found labral tears in 4 cases, 14 labral dissections, and 10 times a complete labral discontinuity. 8 of 9 labrum dissections found intraoperatively were correctly identified on CT. One dissection was not even seen retrospectively on arthro-CT. Six of nine complete labrum discontinuities were seen on arthro-CT, three described as a dissection. All capsular detachments and bony Bankart lesions found on CT were confirmed intraoperatively.(ABSTRACT TRUNCATED AT 250 WORDS)

[Experimental studies of the biomechanical properties of hollow nails and solid nails for interlocking intramedullary nailing in the dog]

Since locked intramedullary nailing of the tibia in dogs was followed by material failure of the conventional slotted hollow nails within days, special solid nails were developed and tested with respect to their mechanical properties. There was a clear advantage of the solid nails over the hollow nails in terms of bending resistance and yield force. In animal experiments--even in long-term experiments over nine months--no case of material failure occurred with the solid nails. The high torsional and bending resistance of the solid nails suggests the use of a mechanical device which, as our experience shows, permits reliable interlocking without the need for an image intensifier, that is to say, without radiation exposure.

[Tikhoff-Linberg scapulo-humeral resection]

There is a trend away from amputation to salvage procedures for limb cancer. An effective adjuvant chemotherapy and the development of diagnostic imaging allow the surgeon to be more confident and conservative with a limb-salvage procedure. The Tikhoff-Linberg resection is a limb-sparing option to be considered for tumors of the proximal humerus and shoulder girdle. There are three different variants of the procedure published in the literature. An exact classification of the local extent of disease is necessary to indicate the variant of Tikhoff-Linberg resection which will promise the best functional result without loss of oncological adequacy.

Role of magnetic resonance imaging in the radiological management of musculoskeletal tumors

The treatment of bone tumors has developed from amputation surgery to refined methods of therapy in the last 20 years. Limb-preserving operations in particular require exact documentation of the intra- and extraosseous extent of the tumors. Our clinical study showed that magnetic resonance imaging (MRI) is equal to or even superior to computed tomography (CT) in regard to the most important radiological criteria. For this reason, MRI can be considered of great value in the radiological management of bone tumors. While CT is in most cases inferior to MRI, there are still special cases which require angiography.