[Treatment of Giant Cell Tumor of Bone in the Distal Radius and Ulna]. / Lécba obrovskobunecného kostního nádoru distálního radia a ulny.

PURPOSE OF THE STUDY The preferred treatment of giant cell tumor of bone is curettage with the use of local adjuvant. If the tumor spreads beyond the bone into soft tissues, en bloc excision should be performed. Intralesional curettage allows joint preservation, but it is associated with a high recurrence rate. The purpose of the study was to identify the risk factors for local recurrence and to compare the functional outcomes after both types of surgical procedures. MATERIAL AND METHODS The group included 16 patients (5 women, 11 men) with giant cell tumor of bone in distal forearm treated at the First Department of Orthopedic Surgery, St. Anne s University Hospital Brno in 2005-2019. The mean age of patients was 38 years (22-53). The follow-up period was 6.75 years (2-15) on average. The most common location of the tumor was distal radius (14). In 6 patients denosumab treatment was indicated. Based on the obtained data, we compared the effects of gender, Campanacci grade, type of surgery and administration of denosumab on the risk of local recurrence. The functional outcomes were evaluated retrospectively based on the Musculoskeletal Tumor Society scoring system for upper limb salvage surgeries. RESULTS Resection and reconstruction using an osteocartilaginous allograft was performed in 9 patients. Seven patients were treated with tumor curettage with bone cement used to fill the cavity. The group of patients who underwent curettage showed a significantly higher mean MSTS score 89% compared to the group of patients with resection with the mean MSTS score 66% (P < 0.05). Local tumor recurrence was reported in 3 patients (18.75%). No statistically significant difference was found in gender, tumor grade, radicality of surgery or administration of targeted therapy with respect to the incidence of local recurrence. Altogether 6 complications (37.5%) were observed in the group. DISCUSSION The treatment of a giant cell tumor of bone aims to completely remove the tumor and to preserve the best possible function of the limb. The complications in distal forearm involve particularly an increase incidence of local recurrence and painful or limited range of motion of the wrist. Whereas curettage with the use of local adjuvant is burdened with a higher recurrence rate, resection with allograft reconstruction of bone defect is usually associated with poorer functional outcomes. CONCLUSIONS Tumor curettage using local adjuvant is preferred in a well-circumscribed tumor and offers an excellent functional outcome. En bloc tumor resection and reconstruction using an osteocartilaginous allograft is a suitable treatment option for a locally advanced tumor with a low risk of local recurrence. Key words: giant cell tumor of bone, distal radius, distal ulna, curettage, osteocartilaginous allograft.

[Open Incisional Biopsy and Ultrasound-Guided Core Needle Biopsy of Extremity-Localized Musculoskeletal Tumors]. / Otevrené incizní biopsie a ultrazvukove navigované punkcní biopsie nádoru pohybového aparátu v oblasti koncetin.

PURPOSE OF THE STUDY To evaluate the results of incisional open biopsies and ultrasound-guided core needle biopsies for musculoskeletal lesions in extremity and limb girdle locations. MATERIAL AND METHODS In 2019, 176 open incisional biopsies were performed at our department, 113 from bone lesions and 63 from soft tissue lesions. In the period of September 2019 to February 2020, we started performing also ultrasound-guided core needle biopsies from soft tissue lesions in limited indications, namely in 23 cases. The diagnostic accuracy, complications and pain associated with the procedure were evaluated. RESULTS Of 113 open incisional biopsies of bone, 91.1% was fully representative and 6.2% non-representative with an indication for re-biopsy. In 53 cases another surgical procedure followed, which fully confirmed the diagnosis made based on the biopsy in 79.2%. In 7.5% the diagnosis slightly changed, with no therapeutic impact, in 5.7% the histological grade was changed, and in 7.5% the diagnosis was substantially modified. Complications appeared in 9.8% of cases. The procedure was associated with pain expressed by an increase in VAS score by 2.7 points. Of 63 soft tissue open incisional biopsies, 100% was fully representative. In 30 cases another surgical procedure followed, which fully confirmed the diagnosis made based on the biopsy in 96.7%, in one case the diagnosis was changed from aggressive benign lesion to a low-grade sarcoma. Complications appeared in 6.4% of cases. The procedure was associated with pain expressed by an increase in VAS score by 1.4 points. Of 23 ultrasound-guided core needle biopsies from soft tissues in limited indications, 100% was representative. In 11 cases another surgical procedure followed, which fully confirmed the diagnosis made based on the biopsy in 81.8%, in 2 cases the diagnosis was slightly changed, with no therapeutic impact or a change of histological grade. No complications were reported. The procedure was associated with minimal pain expressed by an increase in VAS score by 0.1 points. When comparing the group of soft tissue open incisional biopsies and ultrasound-guided core needle biopsies, a statistically significant less pain associated with the procedure was found in the group of core needle biopsies. CONCLUSIONS The biopsy of musculoskeletal tumors should be performed at specialty centers for treatment of these rare conditions. In that case it produces good results and is associated with a low rate of complications. Indications for open biopsy or core needle biopsy must be assessed individually. Key words: musculoskeletal tumors, bone and soft tissue sarcomas, open incisional biopsy, core needle biopsy, fine needle aspiration biopsy, ultrasound-guided core needle biopsy.