[Two-year results of a modular short hip stem prosthesis--a prospective study]

Area of Science:

• Orthopedic Surgery
• Biomaterials Engineering
• Medical Device Technology

Background:

• Cementless hip implants are increasingly used in total hip arthroplasty (THA).
• Modular short hip stems offer potential advantages in preserving bone stock.
• Short-term outcomes of novel implant designs require thorough evaluation.

Purpose of the Study:

• To report the short-term clinical and radiological outcomes of a prospective series of cementless modular short hip stems.
• To assess the efficacy and safety of this specific implant design in THA.
• To identify factors influencing implant stability and patient outcomes.

Main Methods:

• Prospective study of 50 patients undergoing THA with cementless modular short hip stems.
• 48 patients (96%) were available for follow-up at an average of 2.4 years.
• Clinical assessment using Harris Hip Score (HHS) and radiological evaluation.

Main Results:

• Average HHS improved significantly to 95 points post-operatively.
• Two cases required revision: one for periprosthetic fracture and one for aseptic loosening.
• Radiological analysis revealed metaphyseal bone remodeling and good integration in most cases, with some instances of minor migration that resolved clinically.

Conclusions:

• The cementless modular short hip stem demonstrates favorable short-term results in THA for select patients.
• Metaphyseal anchoring is effective when femoral bone quality and morphology are appropriate.
• Careful surgical technique, ensuring proximal-lateral cortical contact, is essential to optimize primary implant stability.