Nakamura N, Sugano N, Nishii T, Kakimoto A, Miki H
A Comparison between Robotic-assisted and Manual Implantation of Cementless Total Hip Arthroplasty. [JOURNAL ARTICLE]
Clin Orthop Relat Res 2009 Nov 5.
BACKGROUND: The benefits of robotic techniques for implanting femoral components during THA are still controversial. QUESTIONS/
PURPOSES: The purpose of this study was to prospectively compare the results and complications of robotic-assisted and hand-rasping stem implantation techniques.
METHOD: The minimum followup was 5 years (mean, 67 months; range, 60-85 months). One hundred forty-six primary THAs on 130 patients were included in this study. Robot-assisted primary THA was performed on 75 hips and a hand-rasping technique was used on 71 hips.
RESULTS: At 2 and 3 years postoperatively, the Japanese Orthopaedic Association (JOA) clinical score was slightly better in the robotic-assisted group. At 5 years followup, however, the differences were not significant. Postoperative limb lengths of the robotic-milling group had significantly less variance than the hand-rasping group. At 2 years postoperatively, there was significantly more stress shielding of the proximal femur in the hand-rasping group; this difference was more significant 5 years postoperatively.
CONCLUSIONS: Substantially more precise implant positioning seems to have led to less variance in limb-length inequality and less stress shielding of the proximal femur 5 years postoperatively.
LEVEL OF EVIDENCE: Level II, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
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