The goal of this clinical trial is to find out if removing and replacing part of the hip bone works better than using metal hardware to stabilize the bone in patients whose cancer has spread to the hip. The main questions are:

1. Does removing and replacing part of the bone work better than just stabilizing it with metal hardware?
2. Does removing and replacing the bone help reduce problems like cancer coming back or the metal hardware breaking?

Researchers will compare two treatments: using metal rods and plates to stabilize the bone (internal fixation) versus removing part of the bone and possibly replacing the hip joint (resection and reconstruction) to see if the second option causes fewer problems.

Participants will:

• Be randomly assigned to one of two groups (internal fixation or resection and reconstruction).
• Have one of the two surgeries based on which group they're in.
• Go to follow-up appointments with the study doctor at 2 weeks, 6 weeks, 4 months, 6 months, 9 months, and 12 months after surgery.

The Proximal FEmur Resection or Internal Fixation fOR Metastases (PERFORM) trial is a multi-centre randomized controlled trial that aims to test a paradigm shift in the oncological surgical management of patients with metastatic bone disease (MBD) of the proximal femur. The PERFORM trial will aim to determine if resection and endoprosthetic reconstruction improves patient-important outcomes compared to internal fixation in patients with MBD of the proximal femur.

MBD afflicts the majority of patients with advanced stage carcinomas and is the most common oncologic disease of the skeleton. The proximal femur is the most commonly affected location in the appendicular skeleton and is a source of significant morbidity affecting patient mobility and quality of life.

Stabilization of an impending or actual fracture of the proximal femur resulting from MBD has historically been achieved with internal fixation using intramedullary nails, plates and screws. This approach is meant to provide enough stability to ambulate without pain for the remainder of the cancer patient's life. However, many patients with metastatic cancer are experiencing longer life spans due to advances in systemic treatment options. Therefore, the traditional methods of stabilizing bones in the setting of MBD may no longer be meeting the standard of outcomes required for patients who can now live for years with their disease. Internal fixation, which is by nature a palliative surgery, results in disease relapse in nearly 20% of patients, most often due to local MBD recurrence. Alternatively, complete resection of the affected bone followed by reconstruction with an endoprosthesis, although more invasive and conferring higher surgical risks than an internal fixation procedure, reduces the risk of cancer recurrence at the surgical site to approximately 3%, thereby avoiding the deleterious effects on patient function and quality of life. However, the evidence supporting the use of resection and endoprosthetic reconstruction of the proximal femur, although promising, is retrospective and methodologically weak, resulting in a gap in the necessary evidence to change practice.

The PERFORM trial will aim to determine if resection and endoprosthetic reconstruction improves patient-important outcomes compared to internal fixation in patients with MBD of the proximal femur.

THe Methods Centre and proposed clinical sites collectively possess the methodological, logistical and clinical expertise required to successfully carry out the PERFORM trial. Ultimately, this trial has the potential to effect significant changes in orthopaedic oncology clinical practice and improve the oncologic, functional, and quality of life outcomes of patients with cancers that have metastasized to their proximal femur. While the introduction of a more invasive yet more durable procedure would represent a paradigm shift in the approach to this patient population, the challenge investigators confront is to support this practice change with high-quality, concrete evidence.

Inclusion Criteria:

• Life expectancy of at least 6 months
• Lesions in the proximal femur (femoral neck, intertrochanteric region, subtrochanteric region, and combinations thereof)
• Low or intermediate risk for perioperative morbidity and/or mortality
• No more than 75% and no less than 25% bone loss
• Mutual (patient and physician) decision to perform surgical management of an impending or realized pathologic fracture due to MBD of the proximal has been made.

Exclusion Criteria:

• Lesions isolated to the femoral neck
• Lesion with any femoral head involvement
• High risk for perioperative morbidity and/or mortality
• Multidisciplinary decision that resection of the entire lesion would be indicated

Protocol will be shared with other researchers via the study website.

Throughout study period.

Publicly available.