Conversion of Hip Arthrodesis to Total Hip Arthroplasty: Survivorship and Clinical Outcome

This study evaluated survivorship and clinical outcomes of patients undergoing conversion of a hip arthrodesis to a total hip arthroplasty (THA) and compared them to 2 patient cohorts: primary THA and first-time revision THA. Patients completed 5 standardized outcome questionnaires. The study cohort was compared to matched groups of primary THA and first-time revision THA patients. Twenty-six patients were identified, 2 deceased and 7 revised, leaving 17 patients available for review. A 10-year survivorship of 74.2% and complication rate of 54% were noted. All outcome scores were lower for the study cohort: clinically significant difference vs revision THA group and statistically significant difference vs primary THA group. Takedown arthrodesis patients experience poor clinical outcomes and high complication rates compared to primary and even revision THA.     

Total Hip Arthroplasty After Previous Transtrochanteric Anterior Rotational Osteotomy for Femoral Head Osteonecrosis

We compared the perioperative morbidity, position of the implants, implant stability, and clinical results of 14 conversion total hip arthroplasties after previous transtrochanteric anterior rotational osteotomy with those of a matched control group of 28 primary total hip arthroplasties. The operation time was prolonged, perioperative blood loss increased, and the risk of stem or cup malposition was increased in the conversion group. However, there were no significant differences in the postoperative complications, clinical results, and implant stability between the 2 groups. None of the implants were loose in both groups. Transtrochanteric anterior rotational osteotomy should be advised, planned, and executed bearing in mind the operative morbidity and technically demanding nature of the conversion total hip arthroplasty.     

化脓性关节炎后遗髋关节畸形的全髋关节置换

目的探讨化脓性关节炎后遗髋关节畸形的全髋关节置换术疗效。方法对2001年4月~2005年2月,将8例接受单侧全髋关节置换术的化脓性关节炎后遗髋关节畸形的患者作为研究对象。患者手术时年龄30~54岁,平均38·4岁。术前短缩2·5~5cm。术中髋臼假体置入真臼中,以重建髋关节旋转中心。结果术后双下肢等长(双下肢相差在1cm内)7例,1例短缩1·5cm。Harris评分由术前平均54分增加到87分。无感染,未见假体松动及植骨块吸收、塌陷。结论化脓性髋关节炎后遗髋关节畸形,全髋关节置换术是一有效的治疗方法。     

陶对陶界面全髋关节置换术后早期脱位

目的探讨现代陶对陶界面人工髋关节术后早期脱位的发生率和影响因素。方法回顾性分析我院骨科2009年6月至2012年12月间行陶对陶的人工髋关节置换术患者192例（212髋）的资料,其中初次行人工髋关节置换术175例（195髋）,人工髋关节翻修17例（17髋）,从股骨头假体的大小和所采用的手术入路以及髋臼的方位三方面,分析对人工髋关节置换术后发生脱位的影响。结果本组患者平均随访28个月（3~42个月）,术后脱位率为0.47%（1/212）,其中初次全髋关节置换术（totalhiparthroplasty,THA）术后脱位率为0,翻修THA术后脱位率为5.89%（1/17）;无骨溶解,无假体松动,无陶瓷破裂等其他并发症。结论现代陶对陶界面THA采用大直径的股骨头、改良Hardinge入路且髋臼位置恰当,可降低人工髋关节置换术后的脱位率。     

Natural History of Squeaking after Total Hip Arthroplasty

Background  

In recent years, a number of alternative bearing surfaces, such as ceramic on ceramic, are being used in THA. Squeaking after THA is a recently recognized complication; however, its incidence is unknown.     

Conversion Total Hip Arthroplasty After Previous Transtrochanteric Rotational Osteotomy for Osteonecrosis of the Femoral Head

The results of conversion total hip arthroplasty (THA) after failed transtrochanteric rotational osteotomy (TRO) are still controversial. We retrospectively reviewed 18 patients with ONFHs who had been treated previously by TRO and were later converted to THAs (conversion group). We made a matched control group of 18 primary THAs for ONFH done by same hip surgeon (PTHA group). There was an improvement in the Harris hip score and WOMAC score at the final follow-up but the improvement was not statistically significant between the two groups. Only internal rotation was significantly better in the PTHA group than in the conversion group. THA after TRO provides satisfactory clinical and radiological outcomes with no significant increase in perioperative morbidity in comparison with that in the primary THA.     

Revision Total Hip Arthroplasty for Aseptically Failed Metal-On-Metal Hip Resurfacing Arthroplasty

BackgroundWhile common, studies assessing outcomes of failed metal-on-metal (MoM) resurfacings converted to total hip arthroplasties (THAs) are limited. We determined the outcomes following revision THA of aseptic MoM hip resurfacings.MethodsBetween 2000 and 2019, we identified 52 revision THAs for failed MoM hip resurfacings through our total joint registry. Mean age was 55 years, 42% were women, and mean body mass index was 28 kg/m². Adverse local tissue response led to THA in 67% of the cases. The most common revision articulation was metal-on-cross-linked or ceramic-on-cross-linked polyethylene (71%). Median head size was 36 mm. The acetabular component was retained in 21% and 28% used dual-mobility constructs. The mean follow-up was 6 years (range, 2-12 years).ResultsThe 5-year survivorships free of any re-revision or reoperation were 89% and 85%, respectively. The primary cause of re-revision (6) was dislocation (4). The 5-year cumulative probability of dislocation was 19% and was 13% in those patients treated with dual-mobility constructs versus 22% in those treated with standard articulations (P = .58). No dislocations occurred in THAs with retained acetabular components and dual-mobility constructs versus a 5-year cumulative probability of dislocation of 25% in those with revised acetabular components and standard articulations (P = .24).ConclusionRevision THAs for aseptically failed MoM hip resurfacings yielded a 5-year survivorship free of re-revision of 89%. The main reason for failure was dislocation, which was reduced, but not statistically significantly, when a dual-mobility construct was used, especially if the acetabular component was retained.Level of EvidenceIV.     

Early Reactive Synovitis and Osteolysis after Total Hip Arthroplasty

Background  

Little is known about intraarticular pathology following THA prior to the radiographic appearance of osteolysis, primarily due to imaging limitations. MRI has recently been applied to imaging the postarthroplasty hip with the ability to detect periarticular bony and soft tissue pathology; specifically, it is able to detect abnormal synovial patterns and focal bone loss well before the radiographic appearance of osteolysis.     

骨矿改变在人工全髋关节置换术的监测

目的：研究人工全髋关节置换术后髋周骨矿含量的改变。方法：对骨水泥型人工全髋关节置换的25例27髋,在术后不同时段用DEXA测定髋周5个区域的骨矿含量,并与其各自合适的对照作配对样本t检验。结果：术后1个月内（平均23d)测定组显示第4区骨矿量显著增加（P＜0．05）;术后4－6月（平均4．4月）和7－12月测定组显示5个区骨矿量无显著增减（P＞0．05）;术后14－49月（平均27．4月）测定组显示第2区和第5区骨矿量显著降低（P＜0．05）;第1区也有明显降低趋势（P＝0．064）。结论：骨水泥型人工全髋置入后髋周承重部位骨矿量在12月内改变不大;术后约2年在髋臼周围和股骨小粗隆部骨矿明显丢失,与置入假体后产生应力遮挡可能有关。