非骨水泥全髋关节置换术治疗股骨头缺血性坏死的中期疗效评估

目的对使用非骨水泥型假体行全髋关节置换术(totalhiparthroplasty,THA)治疗的股骨头缺血性坏死患者进行术后中期的影像学及临床评估,回顾性研究非骨水泥型假体的疗效及其影响因素。方法对1998年1月至2001年3月,采用非骨水泥型假体行THA治疗的股骨头缺血性坏死患者71例(80髋)进行至少5年的随访。临床评估以Harris评分为标准。影像学评估根据术后随访时骨盆正位与髋关节正、侧位X线片,观察髋臼、股骨假体的位置及其周围骨质的改变,并测量臼杯内衬的磨损速度、磨损方向。假体的生存率采用Kaplan-Meier分析,分别以髋臼、股骨假体的无菌性松动和任何原因所致的翻修为终点。结果共54例(62髋)患者获得至少5年的随访,术前Harris评分平均为(44.0±8.4)分(21～50分),终末随访时平均为(92.4±5.7)分(78～100分)。截至末次随访时无一例翻修或表现为影像学无菌性松动。1髋出现骨盆局灶性骨溶解,12髋出现股骨局灶性骨溶解。聚乙烯内衬平均线性磨损率为(0.125±0.074)mm/年。Kaplan-Meier分析假体生存率为1.0(95%可信区间,0.98～1.00)。结论多孔涂层非骨水泥型假体可为晚期股骨头缺血性坏死患者提供良好的中期固定及临床效果。然而,因为聚乙烯髋臼的磨损不可避免及假体周围骨溶解等潜在因素的存在,长期效果仍须进一步随访。     

非骨水泥型全髋关节置换术治疗酒精性股骨头坏死

[目的]研究非骨水泥型全髋关节置换术治疗酒精性股骨头坏死的中期疗效.[方法]1997年3月～2002年6月,采用非骨水泥型全髋关节置换术治疗酒精性股骨头坏死41例(47髋),进行至少5年的随访、中期临床评估和影像学评估.临床评估以Harris评分为标准.影像学根据骨盆正位和髋关节侧位X线片,观察髋臼、股骨假体的位置以及周围骨质的改变.假体的生存率采用Kaplan-Meier分析,分别以股骨、髋臼假体的无菌性松动和任何原因所致的翻修为终点.[结果]得到至少5年随访的41例(47髋),术前Harris评分为42.4±6.4(24～49)分,最后1次随访评分为91.8±4.4(74～100)分.至最后1次随访时无1例翻修或表现为影像学无菌性松动,2髋出现骨盆局灶性骨溶解,6髋出现股骨局灶性骨溶解.Kaplan-Meier分析假体的生存率1.0(95%可信区间,0.98～1.0).[结论]非骨水泥型全髋关节置换术可为晚期酒精性股骨头坏死患者提供良好的中期临床效果.由于假体磨损、假体周围骨溶解等潜在因素,长期效果需要进一步随访.     

全髋表面置换术治疗股骨头坏死

目的:探讨全髋表面置换术治疗股骨头缺血性坏死的疗效和适应证.方法:回顾性分析17例(21髋)股骨头缺血性坏死患者的临床资料.其中男10例,女7例;年龄25～51岁,平均36岁.其中Ficat Ⅲ期8髋,Ficat Ⅳ期13髋.均行金属全髋表面置换术.取Gibson后外侧切口,采用非骨水泥型假体.处理股骨头时,以颈干角通过股骨头中心打入1根导针,用空心钻头钻孔后插入导引杆,再用圆柱形的股骨头切割器锉去股骨头的多余部分,在股骨头上钻孔,将骨水泥涂抹在股骨头和假体上,将假体柄插入股骨颈中心轴骨孔内,冲紧到位,等待骨水泥固化.术后Harris评分分析,并进性统计学分析(t检验),定期复查X线片.结果:全部病例均获得随访,随访时间18～42个月,平均32个月.髋关节功能Harris评分由术前的平均(35.30±5.23)分提高到术后(90.47±3.14)分,优良率90.5％,手术前后Harris评分差异有统计学意义(P＜0.01).X线摄片发现2例髋臼假体周围出现透亮线,而无松动迹象.结论:全髋表面置换术是治疗中晚期股骨头缺血性坏死的理想方法,它能恢复正常的关节生物力学及负载传递,提高了关节的稳定性,延缓了全髋关节置换,不影响日后的翻修效果,且创伤小、操作简便、感染率低.适用于FicatⅢ期及部分FicatⅣ期的股骨头坏死,股骨颈破坏少,特别是活动量大的年轻患者.     

精确匹配的半髋表面置换术治疗股骨头缺血性坏死

目的评价精确匹配的半髋表面置换术治疗股骨头缺血性坏死的疗效。方法回顾性分析41例(48髋)股骨头缺血性坏死患者的临床资料。其中男30例,女11例;年龄29～49岁,平均37岁。其中FicatⅢ期35髋,FicatⅣ期13髋,髋臼相对正常。41例患者(48髋)均采用金属半髋表面置换术。结果全部病例均获得随访,随访时间平均5.2年。平均UCLA髋关节功能评分明显改善(P=0.001),疼痛由术前的3.1分提高到9.1分;步行由4.4分提高到9.2分;活动由5.5分提高到7.1分。按UCLA评分标准,FicatⅢ期35髋术后的满意率为88.6%;FicatⅣ期13髋术后的满意率为69.2%(P=0.25)。8髋疗效差,UCLA髋关节功能评分无明显改善,术后X线检查发现7髋呈髋内翻植入了假体(插入的短柄与股骨轴线的夹角均小于130°)。假体的5年生存率为83.0%。结论在严格掌握手术适应证、提高手术技术的前提下,精确匹配的半髋表面置换术治疗股骨头缺血性坏死的疗效满意。     

表面置换术治疗中青年股骨头缺血性坏死

目的探讨采用表面置换术治疗中青年股骨头坏死的临床效果。方法对11例（14髋）Ficat分期为Ⅲ期或早Ⅳ期的股骨头坏死患者采用股骨头表面置换术，并对假体的形状进行了改进，其中男7例，女4例，年龄35～49岁。对13例（16髋）Ficat分期为Ⅲ期或早Ⅳ期股骨头坏死患者采用全髋表面置换术，其中男8例，女5例，年龄23～48岁。结果股骨头表面置换术患者术后随访1～5年，髋关节Harris评分从术前平均39分增至91分；X线片示假体无松动移位，近段股骨和髋臼无骨吸收和骨溶解，髋关节间隙除1例轻度狭窄外余均无磨损征象，无1例翻修。全髋表面置换术患者术后随访6个月～3年4个月，Harris评分从术前平均30分增至93分，有1例因技术原因术后半年假体松动而进行翻修，评为失败。结论表面置换术是治疗中青年股骨头缺血性坏死较为理想的一种方法。     

全髋关节表面置换术治疗股骨头坏死近期结果

目的 对全髋表面置换术治疗股骨头坏死的近期疗效作一小结，了解影响疗效的因素。方法 自2000年10月～2004年12月，对15例18髋FicatⅢ、Ⅳ期股骨头坏死进行了全髋关节表面置换术，平均年龄39岁（23～49岁）。手术方法按照Amstutz和Nelson提出的标准方法进行，术后进行定期随访。结果 平均随访3．5年（6～50个月），无股骨颈骨折、无脱位、无感染。1例髋臼假体周围发现有透亮带，1例因股骨头假体位置不佳已行翻修。术前平均Harris评分30分，术后为90分，最近一次随访平均评分93分（89～98分）。评价：优16髋，良1髋，差1髋。结论全髋关节表面置换术是治疗FicatⅢ、Ⅳ期且年龄较轻股骨头缺血性坏死的有效方法，近期随访结果满意。     

双极人工股骨头与全髋关节置换术在老年患者股骨头缺血性坏死FicatⅢ期的中远期随访比较

目的比较生物型双极人工股骨头置换与全髋置换术治疗老年FicatⅢ期股骨头缺血性坏死患者的中远期疗效。方法对获得随访的61例（64髋）FicatⅢ期股骨头缺血性坏死患者,其中23例（24髋）行生物型双极人工股骨头置换、38例（40髋）行全髋关节置换术对其行回顾分析比较,观察手术前后Harris评分和术后髋部疼痛、影像学变化等情况。结果术后随访5～13年（平均8年）,末次随访Harris评分全髋置换组（88.5±8.9）分,较股骨头置换组（73.5±8.3）分高,差异有统计学意义（t=6.69,P〈0.05）。在疼痛发生率及翻修率上股骨头置换组分别为37.5%（9/24）、29.2%（7/24）,均较全髋置换组10%（4/40）、7.5%（2/40）高,差异有统计学意义（2=5.41、2=5.39,P均〈0.05）。随访X线检查假体位置,股骨头置换组9例出现髋臼磨损,发生率为37.5%;全髋置换组髋臼松动率为2.5%（1/40）,假体柄松动率为5%（2/40）;股骨头置换组5例出现股骨柄松动,发生率为20.8%（5/24）,两组在股骨柄松动发生率上差异无统计学意义（2=2.41,P〉0.05）;在股骨侧骨溶解发生率上股骨头置换组20.8%（5/24）与全髋关节置换组22.5%（9/40）间的差异无统计学意义（2=2.44,P〉0.05）。结论治疗老年FicatⅢ期股骨头缺血性坏死选择双极股骨头置换术应慎重,对于大多数患者,应积极选用生物型全髋置换术。     

金对金全髋置换治疗中年患者晚期股骨头坏死疗效观察

[目的]探讨金属对金属全髋关节置换术治疗中年患者晚期股骨头坏死近期疗效。[方法]回顾性分析2008年1月～2009年9月对行金属对金属大直径股骨头全髋关节置换术的33例(36髋)股骨头缺血性坏死中年患者,男18例,女15例;平均年龄52.82岁(45～59岁)。双髋同时置换3例,单髋置换27例。假体均采用Corin公司的Optimom金属对金属轴承全髋关节置换系统。[结果]33例患者术后平均随访22.6个月(18～30个月)。Harris评分由术前的平均44.3分(24～83分)提高至随访末期的93.2分(91～96分)。末次随访X线片显示假体位置良好,未发现髋臼和股骨假体的无菌性松动和骨溶解,无异位骨化形成。[结论]金属对金属全髋关节置换术对中年、晚期股骨头坏死患者的早期疗效满意。     

非骨水泥全髋关节置换术治疗股骨头缺血性坏死的疗效观察

[目的]对使用非骨水泥全髋关节置换术治疗股骨头缺血性坏死的患者进行临床及影像学随访,探讨其疗效、并发症及其影响因素。[方法]选取2000年3月~2007年11月以来因股骨头缺血性坏死在本院行非骨水泥全髋关节置换术并具有完整临床及影像资料的76例(91髋)患者进行随访。临床随访包括术前术后Harris评分及各种并发症。影像学评估包括双侧髋关节正位、患髋侧位片,判断股骨及髋臼假体的位置及其周围骨质的变化,并测量髋臼内衬线性磨损量。[结果]截至末次随访时,68例(82髋)获得随访,随访率为90.1%,随访时间平均为48.8个月。术前Harris评分平均为42分(5~86分),末次随访时为93分(53~99分),优良率为90.2%。术后1例患者发生与活动相关的大腿痛,影像学上9髋股骨假体发生早期不稳定,14髋发生应力遮挡,5髋发生异位骨化。无假体松动或翻修病例。[结论]非骨水泥全髋关节置换术治疗晚期股骨头缺血性坏死疗效确切,但存在一过性大腿痛、应力遮挡、异位骨化、假体磨损等并发症,故需长期随访。     

人工全髋关节置换术后翻修的假体选择

目的探讨人工全髋关节置换术后翻修的假体选择. 方法 1995年1月～2002年6月进行全髋关节翻修术33例(33髋),其中男7髋,女26髋.翻修原因:无菌性松动22例,感染后松动8例(其中2例合并窦道形成);股骨头置换术后髋臼磨损3例,不伴有假体中心性脱位.对无菌性松动和股骨头磨损患者采用骨水泥固定型假体13例,生物固定型假体12例,股骨侧翻修假体均选择骨水泥固定型广泛涂层假体,8例感染患者均行一期骨水泥固定型全髋置换. 结果随访6个月～7年6个月,平均3年11个月.2例出现X线透亮带,但无临床不稳;4例遗留持续性疼痛,无假体脱位、断裂.本组Harris评分由术前的24～47分(平均38.6分),上升为术后的68～88分(平均82.4分),满意率87.9%. 结论无菌性松动是全髋关节置换术后翻修的主要原因.髋臼侧翻修假体可选择骨水泥型假体、也可选择生物型假体,股骨侧翻修假体均选择骨水泥固定型广泛涂层假体,感染后的翻修选择骨水泥假体较好.     

全髋关节置换术治疗强直性脊柱炎髋关节强直的中期疗效随访

目的：对全髋关节置换治疗强直性脊柱炎髋关节强直的中期疗效进行回顾性研究。方法：自2000年1月至2008年12月,采用全陶界面全髋置换术治疗67例88髋强直性脊柱炎髋关节强直患者,共获得有效随访55例74髋,男30例,女25例;年龄19～58岁,平均32,6岁。其中应用全生物型假体6l髋,混合型假体13髋。进行最少5年以上随访,平均随访时间（75．2＋8．6）个月。对有效随访的患者进行临床和影像学检查评估疗效。结果：髋关节Harris评分由术前30．8±7．0提高至末次随访时85．2±5．5;髋关节总活动度（屈伸、内收、外展、内旋、外旋等6个方向总和）由术前（21．2±8．5）。提高至术后（142．0±10．2）°。以翻修为终点的5年假体生存率为95．9％。1例因外伤致陶瓷内衬破裂而翻修,1例因术后感染翻修,1例因股骨柄假体周围骨折而翻修。1例术后脱位,经保守治疗成功;3例术后关节异响,非手术治疗后消失。7例术后异位骨化,无临床症状未处理;2例术后大腿疼痛,保守治疗好转。其余病例无论骨水泥或非骨水泥假体,假体周围无骨溶解,股骨侧和髋臼侧假体均无松动和下沉。结论：全髋关节置换是治疗强直性脊柱炎强直髋的一种有效而可靠的方法,其中期随访结果满意。     

Minimum 10-Year Results of Cementless Ceramic-On-Ceramic Total Hip Arthroplasty Performed With Transverse Subtrochanteric Osteotomy in Crowe Type IV Hips

BackgroundTotal hip arthroplasty (THA) performed for developmental dysplasia of the hip is a technically difficult procedure with a high complication rate, especially in the presence of completely dislocated hips. This study aimed to evaluate at least 10 years of follow-up results of cementless, ceramic-on-ceramic (CoC) THA performed with transverse subtrochanteric osteotomy in Crowe type IV hips.MethodsWe retrospectively reviewed 50 patients’ 67 hips that underwent CoC, cementless THA with transverse subtrochanteric osteotomy between 2008 and 2011. Clinical and radiological data of the hips were examined. Clinical results were evaluated using the Harris Hip Score and the Western Ontario and McMaster Universities Osteoarthritis Index.ResultsThe mean Harris Hip Score improved from 22.9 ± 9.9 preoperatively to 94.1 ± 8.1 at the final follow-up (P < 0.001). The median Western Ontario and McMaster Universities Osteoarthritis Index score improved from 72 (interquartile range: 17) preoperatively to 2 (interquartile range: 17) postoperatively (P < 0.001). The preoperative mean leg length discrepancy was improved from 4.9 ± 1 cm to 1.5 ± 1 cm in unilateral cases at the last follow-up (P < 0.001). Revision surgery was required because of nonunion in two patients, prosthetic infection in one patient, and aseptic femoral loosening in the other patient. The overall ten-year survival rate was 94% for femoral stems and 98.5% for acetabular components as per Kaplan-Meier survival analysis.ConclusionTransverse subtrochanteric shortening osteotomy combined with using cementless acetabular and femoral components with a CoC bearing surface promises successful clinical results and high prosthesis survival in the treatment of Crowe IV hips at long-term follow-up.     

Retrospective Long-Term Follow-Up Survival Analysis of the Management of Osteonecrosis of the Femoral Head With Pedicled Vascularized Iliac Bone Graft Transfer

BackgroundOsteonecrosis of the femoral head (ONFH) often affects young, active adults and leads to the destruction of the hip joint and disabling arthritis. Several procedures have been developed to prevent conversion to total hip arthroplasty (THA), especially in young patients who have a high rate of hip revision surgery. The aim of this long-term follow-up is to analyze the results of vascularized iliac bone flap transfer for ONFH treatment.MethodsWe retrospectively reviewed 856 patients (1006 hips) who accepted hip-preserving surgery with vascularized iliac bone grafting due to ONFH (Ficat and Arlet stages II-IV) from January 1985 to December 2012 at our hospital. Radiographic assessment was performed with the Ficat and Arlet system, clinical assessment was performed with the Harris Hip Score system, and quality of life was evaluated with the 36-Item Short Form Survey. The hips included 575 stage II hips, 382 stage III hips, and 49 stage IV hips. We defined clinical failure as conversion to THA or any other hip-preserving surgery because of hip symptoms.ResultsA total of 856 patients (1006 hips) were eventually followed up with an average time of 15 years (range 5-25). In total, 75 patients were lost to follow-up, and 105 hips were converted to THA. The average Harris Hip Score was 87.43 ± 6.42 points at the last follow-up, representing a great improvement compared to the 66.42 ± 6.52 points obtained preoperatively. The Kaplan-Meier survival analysis showed no difference in the 15-year survival rate between patients with stages II and III disease (using THA as an end point). However, the survival rate was lower for patients with stage IV disease than that for patients with stages II and III disease. The survival rate for patients in the glucocorticoid group was lower than that for patients in the idiopathic, alcoholic, and trauma groups. The Physical Component Summary scores ranged from 78 ± 10 to 85 ± 14 postoperatively compared to 30 ± 14 to 55 ± 15 preoperatively, and the postoperative Mental Component Summary scores (range from 34 ± 11 to 59 ± 12) were significantly higher than the preoperative scores (range from 72 ± 11 to 90 ± 10), representing great improvement in patient quality of life. Postoperative complications occurred in 86 patients (4.5%) during the follow-up, including 23 patients with deep venous thrombosis, 16 patients with meralgia paresthetica (which resolved), and 47 patients with secondary wound healing.ConclusionThe vascularized iliac bone flap grafting technique yields significant improvement (particularly in the precollapse disease stages in young patients) for restoration of the biomechanical support of the collapsed femoral head and reconstruction of the blood supply to the osteonecrotic area. This procedure allows these patients to avoid or delay the need for THA surgery.     

人工全髋关节置换在骨性强直髋治疗中的临床及放射学评估

目的:对人工全髋关节置换(THA)在骨性强直髋治疗中的临床及放射学效果进行评估。方法:自2003年1月至2009年8月,20例(30髋)骨性强直的髋关节患者采用THA治疗,其中男12例,女8例;平均年龄36岁。术后临床随访根据Harris评分、患者疼痛缓解满意度、肢体长度差异、髋关节活动范围以及髋关节外展肌力进行评价。X线影像学随访包括对髋臼及股骨柄假体周围骨溶解、假体松动、透光线及异位骨化进行评价。术后平均随访时间为4年。结果:Harris评分由术前的平均(40.75±6.52)分提高至术后平均(86.40±5.42)分;邻近受累关节疼痛完全缓解13例,部分缓解7例;13例外展肌力量恢复满意,跛行症状明显缓解,肢体短缩下降至小于0.5cm;髋关节活动范围较术前显著改善。放射学评估发现2例髋关节周围异位骨化,1例股骨假体周围透光线,无关节假体脱位及翻修的病例。结论:近期随访发现THA在治疗骨性强直的髋关节中可以获得满意的临床疗效,矫正髋关节畸形,恢复髋关节功能,减轻患髋邻近关节的疼痛,改善患者的生活质量。     

髋臼骨折内固定失败术后的全髋关节置换术

目的:探讨髋臼骨折内固定失败术后继发创伤性关节炎和(或)股骨头缺血性坏死行全髋关节置换术的特点及临床疗效。方法:2009年2月至2014年10月,采用全髋关节置换术对31例(31髋)髋臼骨折内固定失败继发创伤性关节炎和(或)股骨头缺血性坏死患者进行治疗,其中男26例,女5例;受伤时平均年龄(41±12)岁。患者因髋臼骨折内固定术后3~132个月,平均(20.6±26.9)个月内继发创伤性关节炎和(或)股骨头缺血性坏死而行全髋关节置换术,全髋关节置换术均采用后外侧入路。观察术后并发症和关节活动度,并比较术前和术后随访时髋关节VAS疼痛评分和Harris髋关节评分。结果:术后27例获得随访,随访时间12~80个月,平均(43.2±11.7)个月。其中出现关节感染1例,假体松动1例,脱位1例,无继发坐骨神经损伤病例发生。所有随访病例髋关节功能和步态有明显改善;至末次随访时,VAS由术前平均(7.6±1.2)分,降低到术后平均(1.2±0.9)分,Harris评分由术前平均(45.5±13.6)分,提高到术后平均(88.5±7.8)分,差异均有统计学意义(P0.01)。髋关节除后伸外,前屈、外展、内收、内旋及外旋活动范围较术前显著增加,差异有统计学意义(P0.05)。X线片复查示:髋臼假体无不稳定发生,1例股骨柄假体下沉3 mm,2例发生异位骨化。结论:正确处理内固定物,提防潜在感染,合理重建髋臼骨缺损,是髋臼骨折内固定失败术后全髋关节置换成功的关键。     

Can we trust combined anteversion and Lewinnek safe zone to avoid hip prosthesis dislocation?

IntroductionDislocation is one of the most common complications after primary total hip arthroplasty (THA). Combined anteversion (CA) is currently considered one of the most important measures of stability for THA. Thus, the aim of this study is to determine the association between a correct CA after THA and hip prosthesis dislocation, and to analyze the reliability of the Lewinnek safe zone parameters.Material and methodsThis is a non-interventional retrospective study, carried out at a tertiary hospital in Spain. 2489 primary THA in 2147 patients between January 2008 and December 2014 were identified. Clinical, biological and radiographic data, including cup inclination and cup and femoral anteversion, were analyzed of all patients who developed a hip prosthesis dislocation.ResultsThirty-four patients met the eligibility criteria to be analyzed. In 73.5% (25/34) of cases, acetabular anteversion (AV) was correct, with a mean AV of 15.1° ± 9.4°. Femoral anteversion (FA) was considered correct only in 38.2% (13/34) of the dislocated THA, with a mean FA of 8.4° ± 17.2°. Sixteen of these 34 patients (47.0%) presented a correct CA, with a mean CA of 24.2° ± 21.0°. Nineteen hips (55.8%) were within the Lewinnek safe zone. Moreover, eleven patients (32.3%) developed a dislocation even though components were within the Lewinnek safe zone and presented a correct CA.ConclusionOur findings suggest that even when the THA components are positioned within a correct CA and in the Lewinnek safe zone, hip prosthesis dislocations can occur in a not inconsiderable percentage of the cases. Thus, further radiological and clinical analysis should be done to identify potential reasons for hip prosthesis dislocation.     

全髋翻修术后假体脱位的预防

目的：探讨采用后方关节囊重建方法对行后外侧入路全髋翻修术后假体脱位的防治作用。方法：本组45例（47髋）经后外侧入路行全髋翻修术的患者，男20例，女25例；平均年龄65岁（55-78岁）。术中将后方关节囊与外旋肌群分别重建固定于前上方原先切开的关节囊断端和大转子顶端的软组织处，回顾性分析术后假体脱位率及脱位的风险因素。股骨假体和髋臼假体均翻修29例（31髋），更换内衬5例（5髋），髋臼、股骨翻修的分别是10例（10髋）和1例（1髋）。第1次翻修的有29例（30髋），第2次翻修的有15例（16髋），第3次翻修的有1例（1髋）。X线评估包括翻修前后下肢长度，髋臼位相，股骨偏心距、前倾角和假体松动。临床功能评价采用Harris评分。结果：45例均获随访，平均随访时间2．7年，除1例感觉前方不稳外，无髋关节感染及脱位发生，该例X线片示髋臼假体过度前倾但无脱位发生。术后所有患者双下肢基本等长，髋臼外展角及前倾角、股骨偏心距和前倾角基本恢复至初次手术前水平。髋臼、股骨假体发生松动各1例。髋关节功能Harris评分由术前平均（49.13±15．53）分升至末次随访的平均（83．59±6.93）分（P〈0．05）。按Harris功能评分标准：优36髋，良5髋，可5髋，差1髋。结论：在假体安放正确、软组织张力恢复满意基础上，后方关节囊及外旋肌群重建有助于降低后外侧入路全髋翻修术后假体脱位的发生率。     

Total Hip Arthroplasty after Previous Chiari Pelvic Osteotomy—A Retrospective Study of 301 Dysplastic Hips

BackgroundControversy exists whether previous pelvic osteotomies have negative effects on total hip arthroplasty (THA). This study evaluates the implant survival and patient-reported outcomes of THA after previous Chiari pelvic osteotomy (CPO).MethodsData on 301 THAs after CPO were collected through clinical and radiological follow-up examinations and telephone interviews. The Kaplan-Meier survivorship analysis depicts implant survival.ResultsOf this consecutive series of 1536 CPOs, follow-up was completed in 405 patients with 504 CPOs after a mean time of 36 years (±8; range, 22-54 years). At follow-up, 301 hips (60%) had already undergone THA. The overall survival of THA with revision as an end point after 10, 20, and 25 years was 93%, 76%, and 68%, respectively. The revision rate was 12%. The average period between THA and revision surgery was 9.6 years (±6.1; 4 months-25.4 years). The patient’s age at revision was 57.9 years (±10; 33.2-78.5 years). Aseptic loosening was the most common of the known reasons for revision surgery.ConclusionThis retrospective study supports the hypothesis that prior CPO does not compromise the prerequisites for successful THA at a later stage. Survival rates of the implanted prosthesis are comparable to primary implanted hips, as overall survival was 93% after 10 years.     

Acetabular and Femoral Component Positioning Using Direct Anterior Approach Versus Posterior Approach in Total Hip Arthroplasty

PurposeDirect anterior approach (DAA) has recently become popular in total hip arthroplasty (THA). However, irrespective of the surgical approach used, component malposition is an important factor affecting function and complications after THA. This study aims to compare component positioning on the femoral and acetabular side between DAA and posterior approach (PA) to the hip joint. We hypothesized that the two approaches are similar in terms of component positioning.MethodsWe prospectively studied 50 patients, matched according to age, sex, and body mass index, undergoing THA, divided non-randomly into 2 groups. Group 1 comprised 25 patients (35 hips) undergoing THA using DAA and group 2 comprised 25 patients (25 hips) undergoing THA using PA. Ten patients from group 1 had simultaneous bilateral THA. Radiological parameters studied were acetabular inclination (AI), coronal femoral stem alignment (CFA), leg length difference (LLD), acetabular cup version (AV), and femoral stem version (FV).ResultsThere was no significant difference in AI, CFA, LLD, AV, and FV between the two groups. Excellent to good inter and intra-observer reliability expressed in terms of intraclass correlation coefficient (ICC) was noted for all the radiographic measurements.ConclusionBoth DAA and PA for THA achieve comparable radiological component positioning. DAA may not provide any advantage over PA in terms of positioning of the prosthesis.Level of EvidenceLevel II, non-randomized comparative study.     

Total Hip Arthroplasty via direct anterior approach for osteonecrosis; comparison with primary hip osteoarthritis in a mid term follow up

BackgroundTo determine the mid-term outcomes of conventional cementless Total Hip Arthroplasty (THA) in patients with avascular necrosis (AVN) of the femoral head and compare to patients with primary hip osteoarthritis (OA).MethodA total of 330 consecutive primary THA procedures (AVN and OA) performed between 2010 and 2013 by a single surgeon and in a single center using the direct anterior approach (DAA) were included. Assessments including SF-36, WOMAC, and Harris Hip Scores (HHS) were retrieved from patients before the surgery and at the latest follow-up. Clinical and functional outcomes were compared between the AVN and OA groups.ResultsA total of 294 consecutive THA (AVN = 107, OA = 187) with 104.4 ± 6.2 months follow-up were analyzed, which AVN patients were significantly younger (32.0 vs. 59.6 y/o). Corticosteroid 34 (31.8%), idiopathic AVN 31 (29.0%) and use of unapproved weight gain supplements (UWGS) 23 (21.5%) were the main reasons for AVN. Despite that preoperative scores were comparable (P > 0.05), the HHS, SF-36, and WOMAC scores are significantly higher in the AVN group after THA surgery (P < 0.05). Moreover, flexion and abduction ROM were significantly higher in the AVN group (P < 0.05). Regarding each complication, no significant difference was observed between groups. In the whole sample, there were 5 (1.7%) revisions due to loosening of acetabular components, all the OA group (P > 0.05).ConclusionConventional cementless THA with highly cross-linked polyethylene provides satisfactory mid-term results in patients with AVN with a low rate of postoperative complications. Compared to primary OA patients, this group reaches superior postoperative scores.