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Related Experiment Video

Updated: Jun 4, 2026

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Published on: June 6, 2025

Proximal humeral replacement using a fixed-fulcrum endoprosthesis.

D Griffiths¹, P D Gikas, C Jowett

¹Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK. dylgrif@hotmail.com

The Journal of Bone and Joint Surgery. British Volume

|March 2, 2011

Summary

Proximal humerus tumor replacement using a fixed-fulcrum endoprosthesis shows reliable outcomes. A new constrained liner significantly reduced dislocation rates, improving patient results.

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Reverse Total Shoulder Arthroplasty

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

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Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Published on: June 6, 2025

Reverse Total Shoulder Arthroplasty

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

Area of Science:

Orthopedic Surgery
Oncology
Biomedical Engineering

Background:

Tumors of the proximal humerus require surgical intervention, often necessitating complex reconstructive procedures.
Massive endoprosthetic replacement is a common surgical option for proximal humerus tumor resection.
Previous endoprosthetic designs faced challenges with instability and dislocation.

Purpose of the Study:

To evaluate the long-term outcomes of proximal humerus tumor replacement using a fixed-fulcrum massive endoprosthesis.
To assess the efficacy of a novel constrained humeral liner in reducing dislocation rates.
To compare functional outcomes between the original prosthesis and the modified prosthesis with the constrained liner.

Main Methods:

A retrospective review of 68 consecutive patients who underwent proximal humerus tumor replacement between 1997 and 2007.
Assessment of functional outcomes using the Musculoskeletal Tumor Society (MSTS) Score and the Toronto Extremity Salvage Score (TESS).
Analysis of complication rates, specifically focusing on prosthetic dislocation, and comparison between the original and constrained liner designs.

Main Results:

The study included 42 surviving patients with a mean follow-up of 5 years and 11 months.
The mean MSTS score was 72.3% and the mean TESS score was 77.2% for the overall cohort.
The original prosthesis had a dislocation rate of 25.9%; however, no dislocations occurred in the four patients who received the new constrained humeral liner.

Conclusions:

Endoprosthetic replacement for proximal humerus tumors using the fixed-fulcrum prosthesis is a reliable procedure with good functional outcomes.
The introduction of a constrained humeral liner significantly mitigates the risk of dislocation, enhancing prosthesis performance.
This improved prosthesis design offers a reliable solution for proximal humerus tumor reconstruction, minimizing major complications.