Radiological Evaluation of 3D Printed Porous Collars in Hip and Knee Resection Prostheses: Pilot Study.

Study Overview
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Brief Summary
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This study aims to evaluate the osseointegration of 3D printed porous collars in hip and knee resection prostheses, in order to eliminate one of the causes of diaphyseal osteolysis, which often lead to loosening of the implants, and therefore to guarantee a further improvement in fixation of the implants in terms of both primary and secondary stability.

Detailed Description
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Non-interventional, retro-prospective, non-pharmacological multicenter pilot study. The objective of the study is the radiological and clinical evaluation of collar osteointegration porous 3D printed in hip and knee resection prostheses. Aims to enroll patients undergoing resection prosthesis surgery hip and knee with the use of 3D printed porous collars, performed according to normal practice clinic at the institutions participating in the study. It is structured in a retrospective part which will evaluate the patients for whom follow-up data is available at the time of the start of the study up to at least 1 year after the operation. And a prospective part (both with regard to patients not yet subjected to intervention, at the start of the study, according to the inclusion criteria, both regarding those in follow-up for whom data are not available according to the time of observation required (1 year)) which will begin once all the necessary authorizations have been obtained administrative requests.

Official Title
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Radiological Evaluation of 3D Printed Porous Collars in Resection Prostheses Hip and Knee: Pilot Study. COLLARS Study.

Conditions
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Radiological Evaluation

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: age > 18 years at the time of surgery. patients undergoing hip and knee resection prosthesis surgery with the use of collars porous 3D printed. date of intervention: starting from the regular entry into use of 3D printed porous collars at the reference center. Patients operated on for primary tumor outcomes. Patients operated on for infection. Patients operated for revisions with severe loss of bone substance. Patients capable of giving informed consent and obtaining written informed consent (prospective part/patients in follow-up). Exclusion Criteria: Patients lost to follow-up and/or for whom radiographic and clinical documentation is not available corresponding to the post-operative moment and the clinical follow-up visit (6 months and 1 years).

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Retrospective part<br>Patients for whom follow-up data up to at least 1 year after surgery is available at the start of the study. | |
| Prospective part<br>Both for patients not yet undergoing treatment intervention, at the start of the study, according to the inclusion criteria, both regarding those in follow-up for whom data are not available according to the time of observation required (1 year), will begin once all necessary authorizations have been obtained administrative requests | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Radiological evaluation | Osseointegration will be assessed by x-ray analysis 6 months and 1 year after surgery | 6 months and 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| QoL evaluation | Patient satisfaction/quality of life will be assessed 6 months and 1 year after surgery validated clinical questionnaire (Oxford score). Bone remodeling will be evaluated by x-ray analysis 6 months and 1 year after surgery. Number of adverse events of any nature during follow-up. Highlight any inter-observer variability in the detection of radiological measurements. | 6 months and 1 year |