Blood transfusion, hospital stay and learning curve in robotic assisted total hip arthroplasty.

Total Hip Arthroplasty (THA) has been defined the surgical procedure of the century considering its outcome and cost-benefit ratio (1). Both standard and robotic assisted procedures are increasing, thus, comparison between standard and robotic surgery become useful to understand the cost-benefit of the latter. The prerequisites of the robotic assisted arthroplasty are precision, accuracy, limitation of errors and safety but, on the other hand, its cost is the main drawback. The primary endpoint of our research was to evaluate differences in terms of blood transfusion rates between standard manual and robotic arm assisted THA. All the robotic procedures have been managed using semi active Robotic Arm interactive orthopaedic System (RIO® MAKO Stryker surgical corporation) in a group of patients who underwent primary uncemented total hip arthroplasty (THA) for osteoarthritis or avascular necrosis. Secondary endpoints were the evaluation of length of hospital stay (LOS), age category, gender and the impact of the learning curve on surgical time in the robotic surgery sample. Our retrospective cohort study was conducted between July 2014 and December 2018. Data have been collected from the Tuscany regional hospital discharge register, extracting the relative Hospital Discharge Forms (SDO). During the period of the study, 1537 patients underwent uncemented total hip arthroplasty for osteoarthritis or avascular necrosis. The sample was divided in two subgroups: 1142 patients (74.3%) operated on with standard manual technique and 395 patients (25.7%) operated on with Mako- Stryker Robotic System. In the descriptive analysis, the average values of age and days of hospitalization with 95% CI were calculated. Mean significance was assessed by the T student test. The association between surgical modality and gender was assessed with the chi-square test. The multivariate logistic regression model was used to evaluate the risk of transfusion (outcome variable), between conventional and robotic surgical techniques. The significance threshold was set up at p <0.05. During the period of the study we observed a decrease in standard surgery and an increase in robotic surgery; an increasing number of women per year underwent total uncemented total hip arthroplasty. We found a statistical significance in favor of robotic procedures in terms of transfusion percentage (OR 6.10, 95% CI 2.96-12.59, p<0,001), highlighting the greatest risk in women (OR 1.90, 95%CI 1.30-2.78, p=0.001 ), length of hospital stay (Mr=4.24, SD=2.04, 95% CI 4.04-4.44) (Ms=8.04, SD=2.84, 95%CI 7.88-8.21), (p<0.01). Operative time in the robotic sample decreased substantially with the rise of surgical experience (106.75±13.4 mins in 2014; 82.79±15.95 mins in 2018) (p<0.01). Since the Robotic procedure is a technologically demanding process, an adequate surgical learning curve is mandatory. Our paper, comparing conventional vs robotic assisted THA, showed in favor of the robotic one, a statistically significant reduction of number of transfusions (p<0.001) and length of hospital stay (p<0.01).

The use of osteo-articular allografts for reconstruction after resection of the distal radius for tumour.

Several techniques have been described to reconstruct a mobile wrist joint after resection of the distal radius for tumour. We reviewed our experience of using an osteo-articular allograft to do this in 17 patients with a mean follow-up of 58.9 months (28 to 119). The mean range of movement at the wrist was 56° flexion, 58° extension, 84° supination and 80° pronation. The mean ISOLS-MSTS score was 86% (63% to 97%) and the mean patient-rated wrist evaluation score was 16.5 (3 to 34). There was no local recurrence or distant metastases. The procedure failed in one patient with a fracture of the graft and an arthrodesis was finally required. Union was achieved at the host-graft interface in all except two cases. No patient reported more than modest non-disabling pain and six reported no pain at all. Radiographs showed early degenerative changes at the radiocarpal joint in every patient. A functional pain-free wrist can be restored with an osteo-articular allograft after resection of the distal radius for bone tumour, thereby avoiding the donor site morbidity associated with an autograft. These results may deteriorate with time.

Osteoid osteoma of the femur with a double nidus: a case report.

Osteoid osteoma is a common benign lesion, that occurs in children and young adults. The authors report the observation of a multifocal lesion which is infrequently reported in the literature. S.A., a 10-year-old female came to our observation complaining of spontaneous pain in her right hip and cruralgia radiating to the homolateral knee over the last 6 months; the symptoms, which increased during the night, were relieved by treatment with NSAIDS. Clinical examination and imaging studies confirmed a diagnosis of osteoid osteoma with a double nidus; the lesion was treated by CT-guided thermo-ablation with radiofrequency under general anaesthesia. Complete regression of symptoms was observed at 2-year follow-up.

Expression of transforming growth factor beta isoforms in osteosarcoma variants: association of TGF beta 1 with high-grade osteosarcomas.

Studies on osteosarcoma cell lines point to the potential importance of transforming growth factor beta (TGF beta) as an autocrine factor which controls the growth of human osteosarcomas. To define further the role of TGF beta isoforms in these neoplasms, a series of 27 osteosarcomas was studied using immunohistochemical, mRNA in situ hybridization, and reverse transcriptase-polymerase chain reaction (RT-PCR) techniques. All 14 central high-grade osteosarcomas, two telangiectatic osteosarcomas, and one high-grade surface osteosarcoma showed cytoplasmic immunoreactivity for TGF beta 1, -2, and -3. The expression of TGF beta 1 was moderate or diffuse in 14 cases (82.3 per cent), while low expression was detected in only three cases (17.7 per cent). For TGF beta 2 and -3, only moderate or diffuse staining was observed. Low-grade parosteal and periosteal osteosarcomas showed low or undetectable levels of TGF beta 1, while TGF beta 2 and -3 were moderately or diffusely expressed. Finally, three dedifferentiated parosteal osteosarcomas were diffusely positive for TGF beta 1, -2, and -3 in the high-grade component, while in the low-grade component, available for analysis in two of these cases, TGF beta 1 was demonstrated in a few neoplastic cells, and TGF beta 2 and -3 maintained a diffuse distribution. Statistical analysis of these data showed that high-grade osteosarcomas had a significantly higher expression of TGF beta 1 than low-grade osteosarcomas, while levels of TGF beta 2 and -3 were comparable in the two groups (p < 0.001; p = 0.3; p = 0.3, respectively; Fisher's exact test). Similarly, mRNA levels of TGF beta 1 detected by in situ hybridization were significantly higher (p = 0.04, Fisher's exact test) in high-grade osteosarcoma variants, while no differences were found for TGF beta 2 and -3 mRNA (p = 1.0; p = 0.2, respectively; Fisher's exact test). In addition, mRNA analysis performed by RT-PCR in seven cases (five high-grade and two low-grade osteosarcomas) confirmed the presence of high levels of TGF beta 1 in high-grade osteosarcomas, while low-grade tumours had low or absent mRNA expression. In conclusion, this positive association suggests that TGF beta 1 may be involved in determining the aggressive clinical behaviour of high-grade osteosarcomas.

Latissimus dorsi pedicled flap applications in shoulder and chest wall reconstructions after extracompartimental sarcoma resections.

AIMS AND BACKGROUND: In sarcomas of shoulder and of chest wall, latissimus dorsi muscle gives the opportunity to solve any plastic problem without recourse to free flaps. The authors report their experience in the use of latissimus dorsi pedicled flap as adjuvant procedure in the surgery of bone and soft tissue sarcoma. METHODS: The latissimus dorsi pedicled flap was used in seventeen patients to reconstruct composite tissue defects after sarcoma resection of the shoulder or of the chest wall. Three groups were recognized. The eight patients of Group I received the flap to close the chest cavity after a multiple rib resection performed to remove a tumor of the chest wall. In Group II four patients had the latissimus dorsi transported to reconstruct the soft tissue coverage over a proximal humerus prosthesis previously applied after bone tumor resection. The five patients of Group III had the flap performed at the same time of the resection of a tumor arising in the shoulder area (1 bone and 4 soft tissue sarcoma). RESULTS: Two patients of the Group II presented a recurrent skin failure. A satisfactory coverage without any flap complication was provided in all the other 15 patients (88%). CONCLUSIONS: Latissimus dorsi pedicled flap represents a reliable and effective technique to reconstruct large chest wall or shoulder soft tissue defects.

Register of primary malignant tumors of the bone at the Rizzoli Orthopaedic Institute in Bologna.

2,123 cases of primitive malignant bone tumors were collected from January 1982 to December 1992 at the Registry of Rizzoli Orthopaedic Institute. General data (name, age, gender, site, diagnosis) and histological and imaging documentation for each patient were filed. Considering the incidence of these tumors, we can assume that this registry (with contribution of more than 50 institutions) collect about 50% of italian cases of primitive malignant bone tumors. This registry permits informations regarding epidemiology, diagnosis and therapy of these rare neoplasms.

Gastrocnemius flaps in the surgical treatment of sarcomas of the knee.

The authors discuss their experience with the pediculated gastrocnemius flap used in the oncological surgery of the knee, in 27 patients. Three groups of patients are evaluated: in one group the method was used in patients affected with bone sarcoma and associated with reconstruction of the resected bone segment; in another group the method was used after infection had occurred as a result of reconstructive surgery; in the third group the method was used at the same time as excision of sarcomas of the soft tissues. The gastrocnemius flap may be used to cover sufficiently wide areas of loss of skin and muscular substance around the knee, and may be effectively used to cover metallic prostheses or composite reconstructive implants (bone-cement-metal). We recommend using the covering technique at the same time as resection and reconstruction are performed in order to avoid the risk of infection, and thus reduce any changes in chemotherapy protocols that postoperative infection would require in these patients. The use of the gastrocnemius flap associated with excision of sarcomas of the soft tissues must be reserved for selected cases. The high incidence of local recurrence after such excisions indicates that either wider excisions using distant free flaps or the association of radiotherapy should be considered.

[Effects of hydration on plasma concentrations of methotrexate in patients with osteosarcoma treated with high doses of methotrexate]. / Effetto dell'idratazione sulle concentrazioni plasmatiche del methotrexate in pazienti con osteosarcoma trattati con alte dosi di methotrexate.

High dose of methotrexate (HDMTX) with leucovorin rescue requires over-hydratation to avoid nephrotoxicity; nevertheless the relationship between hydratation and plasma MTX levels is unknown. We compared the effects of two different types of hydratation (2 lt/m2 vs 1.5 lt/m2) on plasma MTX levels in two groups of patients with osteosarcoma of the extremities and treated with HDMTX (8 g/m2 IV). Samples were obtained at the end of infusion of MTX and 14 and 38 hours after the start of MTX infusion. At the end of infusion of MTX the medium plasma MTX levels proved significantly higher in the group with low hydratation than in the group with high hydratation (585.5 microns/l vs 427.7 microns/l P less than 0.001). The values obtained at 14 and 38 hours, did not show significant differences. No significant differences were seen between the two groups in term of late elimination of MTX and correlated toxicity. These data show that a low hydratation regime allows higher plasma MTX levels at the end of infusion of HDMTX and does not increase the incidence of late elimination of MTX compared to a high hydratation regime.

Primary chemotherapy and delayed surgery for malignant fibrous histiocytoma of bone in the extremity.

Between March 1983 and September 1988, 22 patients with non-metastatic malignant fibrous histiocytoma MFH of bone of the extremities were treated with two regimens of neo-adjuvant chemotherapy successively activated. Preoperatively, the patients received moderate doses of methotrexate and cisplatinum-Regimen 1- or high dose methotrexate, cisplatinum and adriamycin-Regimen 2. Cisplatinum was delivered intraarteriously, the other drugs intravenously. Limb salvage surgery was performed in 20 patients, and 2 patients were amputated. The surgical margins were adequate (radical or wide) in 18 cases and inadequate (marginal) in 4. The histologic response to chemotherapy was good (90% or more tumor necrosis) in 8 patients. In both regimens postoperative chemotherapy was tailored according to the grade of necrosis determined by preoperative treatment on the primary tumor. At an average follow-up of 40 months (15-70), 15 patients (68%) remained continuously disease-free and 7 relapsed with metastases. No local recurrences were observed. Regimen 2 was slightly more effective than Regimen 1 in terms of good histologic response (5/10 vs 1/12) and continuous disease-free survival (8/10 vs 7/127). The results demonstrate that, as in osteosarcoma, in non-metastatic malignant fibrous histiocytoma of bone in the extremities a high percentage of patients can be cured with neoadjuvant chemotherapy and that in most of them limb sparing surgery is possible and safe.

Acute external capsuloligamentous lesions of the knee.

The authors discuss 18 cases of acute capsuloligamentous lesions of the external compartment of the knee submitted to surgical treatment. The results obtained by separately studying the progression of the various types of anatomical lesions revealed a relationship between the entity of the lesion and the results. Positive results were as follows: 100% in isolated lesions of the EC, 70% in lesions of the EC and ACL, 40% in lesions of the EC + ACL + PCL. In grade I distorsion trauma surgery is not indicated; in grade II lesions treatment is based on an objective examination in narcosis, and surgery should be performed when dynamic tests are positive; in grade III lesions surgery is always indicated. An objective examination in narcosis (rarely arthroscopy) is thus of essential importance to therapeutic indications.