Can a magnesium implant rebuild bone and cut pain after tumor surgery?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Subjects with bone tumors (benign or borderline) or tumor-like bone lesions of extremities confirmed by imaging and/or pathology, scheduled for surgical resection. * Bone defects formed after resection of extremity bone tumor, requiring artificial bone repair material for defect filling and reconstruction. * Age from 18 to 75 years old, regardless of gender. * Good general preoperative condition and able to tolerate surgical treatment. * Voluntarily participate in this study, provide written informed consent, and be judged by investigators to comply with study protocol and complete follow-up visits. * No postoperative local rejection or allergic reaction at the operative site. * Diameter of bone defect ≤ 6 cm, and product usage volume ≤ 77 cm³. * Bone defect located in upper extremity (humerus, ulna-radius, carpal bones) or lower extremity (femur, tibia, fibula, ankle, foot bones). Exclusion Criteria: * Active local infection at operative site or severe systemic infection. * Severe bone metabolic diseases that may interfere with bone healing, such as severe osteoporosis or uncontrolled hyperparathyroidism. * Severe cardiac, hepatic, renal insufficiency or other serious systemic diseases which cannot tolerate surgery or interfere with study evaluation. * Severe hematological or immune system disorders. * Pregnant or lactating women. * Expected survival less than 12 months, or unable to complete at least 12-month follow-up. * Known or suspected allergy to collagen, hydroxyapatite or other components of bone repair materials. * Occurrence of local rejection or allergic reaction at operative site after surgery. * Diameter of bone defect \> 6 cm, or product usage volume \> 77 cm³. * Any other conditions judged by investigators making the subject unsuitable for enrollment.