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. 2023 Jun;143(6):3487-3493.
doi: 10.1007/s00402-022-04518-x. Epub 2022 Aug 1.

Total hip arthroplasty with femoral shortening osteotomy using polished cemented stem vs. modular cementless stem in patients with Crowe type IV developmental dysplasia of the hip

Takuji Miyazaki #  1 , Tomohiro Shimizu #  1 , Hisanori Ohura  2 , Naoyuki Katayama  2 , Norimasa Iwasaki  1 , Daisuke Takahashi  3
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Total hip arthroplasty with femoral shortening osteotomy using polished cemented stem vs. modular cementless stem in patients with Crowe type IV developmental dysplasia of the hip

Takuji Miyazaki et al. Arch Orthop Trauma Surg. 2023 Jun.

Abstract

Introduction: There is still little information regarding the advantages of a using a polished tapered stem for Crowe Type IV developmental dysplasia of the hip (DDH). This study aimed to investigate the mid-term clinical and radiological outcomes of primary total hip arthroplasty (THA) with femoral shortening osteotomy using modular and polished tapered stems and to compare the results between the modular and polished tapered stems.

Materials and methods: This retrospective review included 32 patients (37 hips) with Crowe type IV DDH who underwent primary THA with femoral shortening osteotomy using a modular stem (cementless group, 14 hips) or a polished tapered stem (cement group, 23 hips) between 1996 and 2018. Clinical data and radiographic assessments were reviewed to analyze the differences between the two groups.

Results: The mean duration of patient follow-up of the cementless group (134.4 months) was longer than that of the cement group (75.5 months). There were no differences in clinical results, time of bone union, and survival rate between the two groups. However, the cementless group exhibited a higher ratio of intraoperative fracture and thinning of cortical bone including stress shielding, medullary changes, stem alignment changes, and osteolysis, compared to the cement group.

Conclusions: The findings of this study suggest that THA with femoral shortening osteotomy using both cemented and modular stems can provide satisfactory results. However, considering the occurrence of intraoperative fracture and radiographic analysis in the current study, the cement stem may have an advantage for patients with bone fragility and deterioration in bone quality.

Keywords: Cemented stem; Femoral shortening osteotomy; Modular stem; Stem alignment; Total hip arthroplasty.

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