{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:32:25Z","timestamp":1760059945107,"version":"build-2065373602"},"reference-count":18,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2025,7,22]],"date-time":"2025-07-22T00:00:00Z","timestamp":1753142400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Current Oncology"],"abstract":"<jats:p>Osteosarcoma is one of the most common primary bone malignancies, typically occurring around the knee. However, the forearm is a rare site, with tumors in the proximal ulna being extremely uncommon. Primary sarcoma in this location presents a surgical challenge due to the complex anatomy and limited reconstructive options. We report a rare case of a 19-year-old female with non-metastatic, high-grade giant cell-rich osteosarcoma involving the right proximal ulna. To our knowledge, this is only the second reported adult case of this histological subtype in this location. The patient was treated at a specialized oncology center with neoadjuvant and adjuvant chemotherapy, along with wide intra-articular resection for local tumor control. Reconstruction was achieved using a novel, customized 3D-printed articulating cement spacer mold with plate osteosynthesis. Artificial elbow ligamentous reconstruction was performed using FiberTape and FiberWire sutures passed through drill holes, and the triceps tendon was reattached to the cement mold using an endobutton. This cost-effective and personalized surgical approach allowed successful joint reconstruction while maintaining elbow stability and function. Our case highlights a feasible reconstructive option for rare and anatomically challenging osteosarcoma presentations, contributing to the limited literature on proximal ulna giant cell-rich osteosarcoma.<\/jats:p>","DOI":"10.3390\/curroncol32080411","type":"journal-article","created":{"date-parts":[[2025,7,22]],"date-time":"2025-07-22T13:35:28Z","timestamp":1753191328000},"page":"411","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Novel Surgical Reconstruction Using a 3D Printed Cement Mold Following Resection of a Rare Case of Proximal Ulna Osteosarcoma: A Case Report and Description of the Surgical Technique"],"prefix":"10.3390","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6034-9739","authenticated-orcid":false,"given":"Abdulrahman","family":"Alaseem","sequence":"first","affiliation":[{"name":"Department of Orthopedic Surgery, College of Medicine, King Saud University, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4459-0762","authenticated-orcid":false,"given":"Hisham A.","family":"Alsanawi","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, College of Medicine, King Saud University, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Waleed","family":"Albishi","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, College of Medicine, King Saud University, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6676-8803","authenticated-orcid":false,"given":"Ibrahim","family":"Alshaygy","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, College of Medicine, King Saud University, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-1577-358X","authenticated-orcid":false,"given":"Sara","family":"Alhomaidhi","sequence":"additional","affiliation":[{"name":"College of Medicine, King Saud University, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4739-0611","authenticated-orcid":false,"given":"Mohammad K.","family":"Almashouq","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, College of Medicine, King Saud University, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Abdulaziz M.","family":"AlSudairi","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, College of Medicine, King Saud University, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0374-354X","authenticated-orcid":false,"given":"Yazeed A.","family":"Alsehibani","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, College of Medicine, King Saud University, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0160-3869","authenticated-orcid":false,"given":"Abdulaziz O.","family":"Almuhanna","sequence":"additional","affiliation":[{"name":"Department of Orthopedics Surgery, King Saud Medical City, Riyadh 1211, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1016\/j.ijscr.2019.04.017","article-title":"A giant cell rich osteosarcoma of the proximal ulnar bone treated by elbow arthroplasty: A case report","volume":"58","author":"Cahayadi","year":"2019","journal-title":"Int. J. Surg. Case Rep."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"S67","DOI":"10.4103\/jomfp.JOMFP_251_19","article-title":"Giant cell-rich osteosarcoma\u2014A rare case","volume":"24","author":"Mallick","year":"2020","journal-title":"J. Oral Maxillofac. Pathol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1228","DOI":"10.1159\/000518266","article-title":"Dedifferentiated Osteosarcoma of the Distal Ulna: A Case Report","volume":"14","author":"Tsujisaka","year":"2021","journal-title":"Case Rep. Oncol."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"101496","DOI":"10.1016\/j.jcot.2021.101496","article-title":"Elbow reconstruction after excision of proximal ulna tumors: Challenges and solutions","volume":"20","author":"Gulia","year":"2021","journal-title":"J. Clin. Orthop. Trauma"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"741","DOI":"10.1007\/s00428-016-1926-9","article-title":"Giant cell rich osteosarcoma revisited-diagnostic criteria and histopathologic patterns, Ki67, CDK4, and MDM2 expression, changes in response to bisphosphonate and denosumab treatment","volume":"468","author":"Chow","year":"2016","journal-title":"Virchows Arch."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"12","DOI":"10.1051\/sicotj\/2017028","article-title":"Osteosarcoma: A comprehensive review","volume":"4","author":"Misaghi","year":"2018","journal-title":"SICOT J."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1007\/s11864-017-0464-2","article-title":"Osteogenic Sarcoma: Systemic Chemotherapy Options for Localized Disease","volume":"18","author":"Harrison","year":"2017","journal-title":"Curr. Treat. Options Oncol."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"205","DOI":"10.1007\/s11999-007-0011-8","article-title":"Osteoarticular and total elbow allograft reconstruction with severe bone loss","volume":"466","author":"Kharrazi","year":"2008","journal-title":"Clin. Orthop."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"e0451","DOI":"10.2106\/JBJS.CC.18.00451","article-title":"Radial neck-to-humerus transposition for elbow reconstruction following oncologic resection of the proximal ulna: A report of two cases","volume":"9","author":"Houdek","year":"2019","journal-title":"JBJS Case Connect."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"7812018","DOI":"10.1155\/2019\/7812018","article-title":"Reconstructive challenges of proximal ulnar bone tumors: Our experience with biological osteoarticular reconstruction using extracorporeal irradiation and reimplantation","volume":"2019","author":"Gundavda","year":"2019","journal-title":"Sarcoma"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1384","DOI":"10.1016\/j.jhsa.2008.04.004","article-title":"Radius neck-to-humerus trochlea transposition for elbow reconstruction after resection of the proximal ulna: Report of 2 cases","volume":"33","author":"Duncan","year":"2008","journal-title":"J. Hand Surg. Am."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"430","DOI":"10.1093\/jjco\/hyf088","article-title":"Hemiarthroplasty of the elbow with a vascularized fibular graft after excision of Ewing\u2019s sarcoma of the proximal ulna: A case report","volume":"32","author":"Kimura","year":"2002","journal-title":"Jpn. J. Clin. Oncol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"7605","DOI":"10.12998\/wjcc.v9.i25.7605","article-title":"Total hip revision with custom-made spacer and prosthesis: A case report","volume":"9","author":"Liu","year":"2021","journal-title":"World J. Clin. Cases."},{"key":"ref_14","first-page":"9272075","article-title":"The Patient-Specific Implant Created with 3D Printing Technology in Treatment of the Irreparable Radial Head in Chronic Persistent Elbow Instability","volume":"2018","author":"Luenam","year":"2018","journal-title":"Case Rep. Orthop."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Exner, G.U., Dumont, C.E., Walker, J., and F\u00fcrnstahl, P. (2021). Cement Spacer Formed in a 3D-Printed Mold for Endoprosthetic Reconstruction of an Infected Sarcomatous Radius: A Case Report. JBJS Case Connect., 11.","DOI":"10.2106\/JBJS.CC.20.00568"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"107155","DOI":"10.1016\/j.ijscr.2022.107155","article-title":"Wide resection and reconstruction of giant cell tumor of the distal humerus with favorable outcomes in 3 months: A case report","volume":"95","author":"Guntur","year":"2022","journal-title":"Int. J. Surg. Case Rep."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"120","DOI":"10.1016\/j.jse.2018.08.013","article-title":"Management of elbow dysfunction associated with giant cell tumor of the distal humerus: Achieving oncologic safety and good function by a combined reconstruction","volume":"28","author":"Cui","year":"2019","journal-title":"J. Shoulder Elb. Surg."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"511","DOI":"10.1016\/j.jseint.2023.01.007","article-title":"Total elbow replacement for giant-cell tumor of bone after denosumab treatment: A case report","volume":"7","author":"Apostolopoulos","year":"2023","journal-title":"JSES Int."}],"container-title":["Current Oncology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1718-7729\/32\/8\/411\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T18:13:56Z","timestamp":1760033636000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1718-7729\/32\/8\/411"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,7,22]]},"references-count":18,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2025,8]]}},"alternative-id":["curroncol32080411"],"URL":"https:\/\/doi.org\/10.3390\/curroncol32080411","relation":{},"ISSN":["1718-7729"],"issn-type":[{"type":"electronic","value":"1718-7729"}],"subject":[],"published":{"date-parts":[[2025,7,22]]}}}