[Experiences with the Spotorno expansion acetabulum]

Area of Science:

• Orthopedic surgery
• Biomaterials science
• Bone biomechanics

Background:

• Hip joint replacements are common procedures for conditions like coxarthrosis and femur neck fractures.
• Existing prostheses aim to mimic natural joint mechanics but face challenges with long-term stability and bone integration.
• The Spotorno cupshell prosthesis offers a cementless design intended to enhance bone ingrowth and stability.

Purpose of the Study:

• To assess the clinical outcomes and biomechanical stability of the cementless Spotorno cupshell prosthesis.
• To evaluate bone regeneration and implant fixation after one to two years of functional weight-bearing.

Main Methods:

• A retrospective analysis of 53 hip joints treated with the Spotorno cupshell and a cementless femoral prosthesis.
• Implantation involved securing the cupshell via cramp points for primary stability.
• Follow-up included clinical assessments and radiographic evaluation after one to two years.

Main Results:

• The cementless CLS expansion-shell demonstrated primary stability through bone-penetrating cramp points.
• Secondary stability is achieved through bone ingrowth onto the titanium shell surface.
• Initial follow-up indicates positive bone regeneration and implant stability.

Conclusions:

• The Spotorno cupshell prosthesis provides a viable cementless option for hip replacement.
• The design's focus on elastic and mechanical bone structures shows potential for durable fixation.
• Further long-term studies are warranted to confirm sustained outcomes in bone regeneration and cramp stability.