米爾阿里木·木爾提扎,趙巍,王利,袁宏*
(1.新疆醫(yī)科大學(xué)研究生學(xué)院,新疆 烏魯木齊 830011;2.新疆自治區(qū)人民醫(yī)院骨科中心關(guān)節(jié)外科,新疆 烏魯木齊 830001)
不同類型的膝關(guān)節(jié)假體對(duì)站立時(shí)靜態(tài)穩(wěn)定性的影響研究
米爾阿里木·木爾提扎1,趙巍2,王利2,袁宏2*
(1.新疆醫(yī)科大學(xué)研究生學(xué)院,新疆 烏魯木齊 830011;2.新疆自治區(qū)人民醫(yī)院骨科中心關(guān)節(jié)外科,新疆 烏魯木齊 830001)
目的 探討人工全膝關(guān)節(jié)置換術(shù)(total knee arthroplasty,TKA)中選用固定平臺(tái)(fixed-bearing)型(PFC-sigma)和旋轉(zhuǎn)平臺(tái)(rotating-platform)型(PFC-RP)膝關(guān)節(jié)假體對(duì)膝關(guān)節(jié)骨關(guān)節(jié)炎(knee osteoarthritis,OA)患者術(shù)后軀體靜態(tài)穩(wěn)定性產(chǎn)生的影響。方法 對(duì)2011年1月至2013年12月在我院接受單側(cè)TKA的OA患者45 例(選用旋轉(zhuǎn)平臺(tái)型假體PFC-RP的患者21 例,選用固定平臺(tái)型假體PFC-Sigma的患者24 例)進(jìn)行分析。術(shù)前、術(shù)后6個(gè)月和術(shù)后1年時(shí)采用HSS評(píng)分標(biāo)準(zhǔn)對(duì)術(shù)側(cè)膝關(guān)節(jié)進(jìn)行功能評(píng)估,并用重心測(cè)量?jī)x對(duì)患者進(jìn)行站立平衡試驗(yàn),連續(xù)記錄軀體重心位置(gravity center position,GCP)。對(duì)GCP在水平方向上轉(zhuǎn)移程度(medio-lateral displacement,ML-X range)以及GCP漂移軌跡(locus of GCP,LG)進(jìn)行量化并分析兩組患者之間的靜態(tài)穩(wěn)定性、術(shù)側(cè)膝關(guān)節(jié)恢復(fù)情況以及術(shù)后并發(fā)癥發(fā)生率的差異性。結(jié)果 TKA后單位時(shí)間內(nèi)GCP在水平方向上平均位置由初始位置逐漸向術(shù)側(cè)轉(zhuǎn)移,且兩組患者之間ML-X range上變化程度差異均無(wú)統(tǒng)計(jì)學(xué)意義(P>0.05),而選用PFC-RP型假體的患者LG水平明顯較選用PFC-Sigma的患者小,且差異性有統(tǒng)計(jì)學(xué)意義(P<0.05)。結(jié)論 兩組患者術(shù)后術(shù)側(cè)膝關(guān)節(jié)恢復(fù)情況、并發(fā)癥發(fā)生率無(wú)明顯差異性,而選PFC-RP型假體的患者較PFC-Sigma的患者具有更好的靜態(tài)時(shí)穩(wěn)定性。
人工全膝關(guān)節(jié)置換術(shù);骨關(guān)節(jié)炎;旋轉(zhuǎn)平臺(tái)型;固定平臺(tái)型;靜態(tài)時(shí)穩(wěn)定性
人工全膝關(guān)節(jié)置換術(shù)(total knee arthroplasty,TKA)已在治療晚期膝關(guān)節(jié)骨關(guān)節(jié)炎(osteoarthritis,OA)疾病中取得了良好的療效。OA的病理性改變能夠影響到膝關(guān)節(jié)本體感覺(jué),從而影響到患者維持軀體平衡的能力[1]。而人體維持軀體平衡能力對(duì)順利進(jìn)行日常活動(dòng)、維持靜態(tài)時(shí)姿勢(shì)穩(wěn)定性極為重要[2]。有關(guān)報(bào)道指出患者經(jīng)TKA后膝關(guān)節(jié)本體感覺(jué)能夠部分恢復(fù)[3],這樣患者運(yùn)動(dòng)協(xié)調(diào)功能和膝關(guān)節(jié)穩(wěn)定性較術(shù)前得到明顯改善[4]。隨著生物材料技術(shù)的進(jìn)一步成熟,目前 TKA中已普遍使用固定平臺(tái)型(fixed-bearing)假體PFC-Sigma與旋轉(zhuǎn)平臺(tái)型(rotating-platform)假體PFC-RP等第三代人工關(guān)節(jié)假體,并取得令人滿意的療效[5-9]。在實(shí)際臨床中骨溶解、假體無(wú)菌性松動(dòng)以及聚乙烯墊片的磨損等均是影響TKA長(zhǎng)期療效以及增大TKA翻修難度的重要因素,國(guó)內(nèi)外學(xué)界一致認(rèn)為以上因素與術(shù)中選用的假體類型密切相關(guān)[10-12]。目前國(guó)內(nèi)外大部分研究中僅以術(shù)后膝關(guān)節(jié)活動(dòng)功能和假體長(zhǎng)期存活率作為判斷手術(shù)是否成功的金標(biāo)準(zhǔn)。有關(guān)研究指出選用PFC-Sigma型或PFC-RP型假體對(duì)術(shù)后關(guān)節(jié)功能、假體長(zhǎng)期存活率以及解除疼痛等均無(wú)明顯差異性[13]。而尚無(wú)詳細(xì)臨床研究對(duì)選用PFC-Sigma型或PFC-RP型假體對(duì)患者靜態(tài)時(shí)穩(wěn)定性的影響進(jìn)行比較。本研究目的在于比較采用PFC-Siga型假體與PFC-RP型假體的患者在TKA術(shù)后6個(gè)月、術(shù)后1年時(shí)的關(guān)節(jié)疼痛、活動(dòng)功能恢復(fù)情況以及患者靜態(tài)穩(wěn)定性的差異性,并對(duì)其原因進(jìn)行初步分析。
1.1 一般資料 本研究通過(guò)我院倫理委員會(huì)審批通過(guò),所有患者被納入之前均給予詳細(xì)解釋,術(shù)前每位患者均與手術(shù)醫(yī)師進(jìn)行詳細(xì)談話,自愿地選擇術(shù)中選用的假體類型,并簽署本研究知情同意書(shū)。分析2011年1月至2013年12月在我院接受單側(cè)TKA的45 例患者,其中選用旋轉(zhuǎn)平臺(tái)型假體(PFC-RP,Depuy)的患者21 例,選用固定平臺(tái)型假體(PFC-Sigma,Depuy)的患者24 例。本研究納入標(biāo)準(zhǔn)為:所有患者均為右側(cè)膝關(guān)節(jié)骨關(guān)節(jié)炎,對(duì)側(cè)膝關(guān)節(jié)無(wú)明顯異常。排除標(biāo)準(zhǔn)為:膝關(guān)節(jié)重度外翻或內(nèi)翻畸形超過(guò)15°,患有神經(jīng)系統(tǒng)或嚴(yán)重的內(nèi)科基礎(chǔ)性疾病,類風(fēng)濕病,術(shù)側(cè)下肢接受過(guò)手術(shù)治療,雙下肢不等長(zhǎng),隨訪期間服用影響軀體平衡性及視力的藥物的患者。
1.2 手術(shù)方法 所有手術(shù)均在垂直層流性手術(shù)室全麻狀態(tài)下完成。手術(shù)入路均取標(biāo)準(zhǔn)的膝關(guān)節(jié)正中髕旁切口,使用髓外導(dǎo)向進(jìn)行脛骨截骨,用髓外導(dǎo)向進(jìn)行股骨髁截骨。股骨與脛骨假體均使用骨水泥固定。所有手術(shù)均未進(jìn)行髕骨表面置換。裝完假體后均對(duì)膝關(guān)節(jié)周圍的軟組織進(jìn)行適當(dāng)?shù)卣{(diào)整。所有患者圍手術(shù)期預(yù)防性應(yīng)用抗生素,預(yù)防術(shù)后靜脈血栓。在術(shù)后1 d開(kāi)始逐漸進(jìn)行康復(fù)訓(xùn)練,包括下肢連續(xù)被動(dòng)運(yùn)動(dòng),主動(dòng)或輔助下進(jìn)行逐漸增大膝關(guān)節(jié)活動(dòng)幅度以及行走步態(tài)訓(xùn)練等專業(yè)功能康復(fù)鍛煉。
1.3 臨床評(píng)價(jià) 根據(jù)美國(guó)特種外科醫(yī)院(hospital special knee scores,HSS)評(píng)分標(biāo)準(zhǔn)對(duì)患者術(shù)前、術(shù)后6個(gè)月,術(shù)后1年時(shí)的膝關(guān)節(jié)功能恢復(fù)情況進(jìn)行評(píng)定[14]。本研究中通過(guò)重心測(cè)量?jī)x對(duì)患者軀體重心(gravity center position,GCP)進(jìn)行測(cè)定。讓每位患者在重心測(cè)量?jī)x上無(wú)扶助條件下站立1 min,并讓患者注視前方3 m遠(yuǎn)處固定目標(biāo)物。在測(cè)量時(shí)間內(nèi)確保無(wú)外物進(jìn)入患者視線干擾(見(jiàn)圖1)。每2秒進(jìn)行一次GCP測(cè)定,連續(xù)記錄1 min內(nèi)的GCP位置。分別對(duì)GCP在單位時(shí)間內(nèi)水平方向上轉(zhuǎn)移程度(medio-lateral displacement,ML-X range) 和GCP漂移軌跡(locus of GCP,LG)進(jìn)行量化分析。單位時(shí)間內(nèi)LG能夠表示由人本體感受性反射控制的維持軀體平衡性能力[15-16]。若在進(jìn)行上述試驗(yàn)的過(guò)程中,患者在規(guī)定的時(shí)間內(nèi)無(wú)法站立平穩(wěn)或要求停頓時(shí)該次操作視為無(wú)效,進(jìn)行重新測(cè)取。
圖1 患者在術(shù)后6個(gè)月時(shí)進(jìn)行站立平衡試驗(yàn)
1.4 統(tǒng)計(jì)學(xué)方法 利用SPSS 17.0統(tǒng)計(jì)學(xué)軟件進(jìn)行處理研究有關(guān)的數(shù)據(jù)。根據(jù)術(shù)中選用的假體類型分PFC-RP組和PFC-Sigma組。兩組患者術(shù)前、術(shù)后6個(gè)月、術(shù)后1年時(shí)的相關(guān)變量進(jìn)行配對(duì)t檢驗(yàn)。為較客觀描述患者術(shù)后GCP轉(zhuǎn)移情況,需算出患者在測(cè)量時(shí)間內(nèi)的所有GCP的橫軸平均位置,故在研究中描述平準(zhǔn)值與表均差時(shí)利用95%的可信區(qū)間。用卡方檢驗(yàn)來(lái)比較兩組之間總的并發(fā)癥發(fā)生率差異性。為使研究中混淆因素降低,我們盡可能地排除在骨質(zhì)、對(duì)疼痛耐受程度、術(shù)后康復(fù)過(guò)程等方面存在差異性的患者,且均選用同一家公司的兩種假體。本研究有關(guān)GCP數(shù)據(jù)均取上圖中平移距離,以圖中單元格為計(jì)量單位(見(jiàn)圖2~3)。從圖中獲取有關(guān)數(shù)據(jù)時(shí),以患者術(shù)側(cè)(右側(cè))為水平軸(X軸)方向上的正方向(+),左側(cè)為負(fù)方向(*),患者站在測(cè)量?jī)x上面對(duì)方向?yàn)榭v軸(Y軸)方向上的正方向(+),后側(cè)為負(fù)方向(*)。以P<0.05為差異具有統(tǒng)計(jì)學(xué)意義。
本研究中45 例患者,其中選用PFC-RP的患者21 例,選用PFC-Sigma的患者24 例。兩組患者平均年齡、術(shù)前體重、身高、體重指數(shù)(body mass index,BMI),術(shù)前術(shù)側(cè)膝關(guān)節(jié)HSS評(píng)分之間的差異性均無(wú)統(tǒng)計(jì)學(xué)意義(見(jiàn)表1)。
2.1 術(shù)側(cè)膝關(guān)節(jié)HSS評(píng)分 本研究中PFC-Sigma組與PFC-RP組之間在術(shù)前、術(shù)后6個(gè)月及術(shù)后1年時(shí),術(shù)側(cè)膝關(guān)節(jié)HSS評(píng)分差異均無(wú)統(tǒng)計(jì)學(xué)意義。術(shù)后患側(cè)膝關(guān)節(jié)HSS評(píng)分均較術(shù)前時(shí)有明顯變化,且差異均有統(tǒng)計(jì)學(xué)意義(P<0.05,見(jiàn)表2)。
a 術(shù) 前 b 術(shù)后6個(gè)月 c 術(shù)后1年
圖2 1 例選用PFC-Sigma型假體的患者在術(shù)前、術(shù)后6個(gè)月、術(shù)后1年時(shí)行GCP飄移軌跡LG
a 術(shù) 前 b 術(shù)后6個(gè)月 c 術(shù)后1年
圖3 1 例選用PFC-RP型假體的患者在術(shù)前、術(shù)后6個(gè)月、術(shù)后1年時(shí)行GCP飄移軌跡LG
表1 兩組患者術(shù)前一般情況比較
表2 兩組患者HSS功能評(píng)分對(duì)比分)
2.2 并發(fā)癥
2.2.1 切口感染 兩組中均有2 例患者術(shù)后早期(術(shù)后3~7 d)出現(xiàn)膝關(guān)節(jié)術(shù)區(qū)發(fā)紅,皮溫持續(xù)高等感染癥狀。以上4 例患者均積極進(jìn)行抗炎或切開(kāi)清創(chuàng)對(duì)癥處理后癥狀明顯好轉(zhuǎn)或消失。對(duì)切口周圍滲出液進(jìn)行一般細(xì)菌培養(yǎng),培養(yǎng)結(jié)果均為無(wú)菌生長(zhǎng)。2 例PFC-RP組患者術(shù)后出現(xiàn)膝關(guān)節(jié)腫脹,對(duì)其進(jìn)行消腫或關(guān)節(jié)腔穿刺抽出對(duì)癥處理后,癥狀明顯好轉(zhuǎn)。并對(duì)患者進(jìn)行凝血相關(guān)檢查。兩組患者術(shù)后早期出現(xiàn)切口愈合有關(guān)的并發(fā)癥率之間差異無(wú)統(tǒng)計(jì)學(xué)意義(P>0.05)。
2.2.2 術(shù)后疼痛 14%的PFC-Sigma組患者和9.5%的PFC-RP組患者術(shù)后出現(xiàn)膝關(guān)節(jié)周圍疼痛癥狀,給予止痛并康復(fù)對(duì)癥治療后疼痛癥狀有效緩解并逐漸消失。
2.2.3 其他并發(fā)癥 研究中兩組患者均未出現(xiàn)術(shù)后膝關(guān)節(jié)脫位,明顯骨溶解等癥狀。1 例PFC-Sigma患者出現(xiàn)術(shù)側(cè)下肢深靜脈血栓,給予抬高患肢并進(jìn)行抗凝對(duì)癥處理3周后再次進(jìn)行下肢血管彩超檢查,未發(fā)現(xiàn)下肢靜脈血栓(見(jiàn)表3)。
表3 兩組患者術(shù)后出現(xiàn)的并發(fā)癥(例)
2.3 穩(wěn)定性 研究中發(fā)現(xiàn)兩組患者在術(shù)后6個(gè)月和術(shù)后1年時(shí),在水平方向上患者GCP均由初始位置逐漸向術(shù)側(cè)方向轉(zhuǎn)移,與術(shù)前時(shí)平均位置比較其轉(zhuǎn)移差異均有統(tǒng)計(jì)學(xué)意義(P<0.01)。而術(shù)后6個(gè)月和術(shù)后1年時(shí),水平方向上GCP較術(shù)前轉(zhuǎn)移程度兩組患者之間差異無(wú)統(tǒng)計(jì)學(xué)意義(P>0.05,見(jiàn)表4)。
術(shù)后6個(gè)月、術(shù)后1年時(shí),兩組患者LG水平均較術(shù)前逐漸變小。跟術(shù)前時(shí)LG水平比較差異均有統(tǒng)計(jì)學(xué)意義(P<0.05)。而術(shù)后6個(gè)月、術(shù)后1年時(shí),兩組患者之間LG水平的差異均無(wú)統(tǒng)計(jì)學(xué)意義(P>0.05,見(jiàn)表4,見(jiàn)圖2~3)。
表4 兩組患者之間穩(wěn)定性指標(biāo)對(duì)比
TKA選用PFC-Sigma型假體已取得較好的臨床療效[17-21],在術(shù)后10~15年的隨訪中發(fā)現(xiàn)假體存活率甚至高達(dá)90%以上[22-23],并且在年輕和高齡患者中均有較好的效果[24-25]。然而,因傳統(tǒng)PFC-Sigma型假體設(shè)計(jì)原因,可能出現(xiàn)的假體聚乙烯墊片磨損、骨溶解等現(xiàn)象均可能導(dǎo)致假體松動(dòng)甚至可能需要二次手術(shù)[26]。從假體設(shè)計(jì)理論上分析,PFC-RP型假體與PFC-Sigma型假體相比,脛骨平臺(tái)處有旋轉(zhuǎn)軸,更能改善術(shù)后膝關(guān)節(jié)活動(dòng),允許脛骨平臺(tái)在縱軸上旋轉(zhuǎn),有效減少聚乙烯墊片磨損,減輕假體骨水泥界面受到的壓力,從而減少發(fā)生骨溶解和假體松動(dòng)的可能[27-28]。目前許多文獻(xiàn)從TKA后臨床療效、假體存活壽命、術(shù)后影像學(xué)以及關(guān)節(jié)活動(dòng)功能等方面比較PFC-RP型假體與PFC-Sigma型假體的區(qū)別,結(jié)果顯示兩種假體之間均無(wú)明顯差異性[29-35]。而目前國(guó)內(nèi)外尚無(wú)研究分析出選用兩種假體對(duì)患者術(shù)后靜態(tài)穩(wěn)定性的影響。本研究中兩組患者術(shù)后膝關(guān)節(jié)恢復(fù)程度差異無(wú)統(tǒng)計(jì)學(xué)意義。
我們可以推測(cè)隨著患者術(shù)后關(guān)節(jié)功能恢復(fù),術(shù)側(cè)膝關(guān)節(jié)負(fù)重量逐漸增大,而對(duì)側(cè)膝關(guān)節(jié)負(fù)重量逐漸減少,術(shù)側(cè)膝關(guān)節(jié)疼痛逐漸減輕,患者逐步恢復(fù)軀體的平衡。本研究中,TKA后患者GCP由初始位置逐漸向術(shù)側(cè)方向轉(zhuǎn)移,且患者維持軀體平衡性能力逐漸得到改善。
影響軀體穩(wěn)定性的主要因素有膝關(guān)節(jié)疼痛、下肢肌力減弱及本體感覺(jué)減退等[16]。膝OA患者下肢肌力及膝關(guān)節(jié)本體感與同性別和年齡段的人群相比減弱較明顯,故膝OA患者軀體不穩(wěn)定性更顯著[36]。隨膝OA病程進(jìn)展,關(guān)節(jié)腔及周圍組織中的感受器數(shù)量減少,導(dǎo)致患者膝關(guān)節(jié)本體感覺(jué)減退,從而影響患者軀體平衡性[36-38]。TKA目的在于長(zhǎng)期緩解或消除關(guān)節(jié)疼痛,改善膝關(guān)節(jié)功能,從而提高生活質(zhì)量。目前關(guān)于TKA對(duì)關(guān)節(jié)本體感覺(jué)及軀體平衡性的影響存在較多的爭(zhēng)議。有些學(xué)者認(rèn)為患者本體感覺(jué)通過(guò)TKA能夠得到改善,從而患者維持軀體平衡性較術(shù)前有所提高[39-40],相反有文獻(xiàn)指出TKA后,患者減退的本體感覺(jué)和軀體穩(wěn)定性未見(jiàn)明顯改善[41-43]。本研究中所有患者術(shù)后LG均較術(shù)前時(shí)明顯變小,表明術(shù)后患者軀體平衡性經(jīng)TKA逐漸好轉(zhuǎn),其中PFC-RP組患者LG變化程度較PFC-Sigma組較為明顯。筆者認(rèn)為原因可能為與PFC-RP假體設(shè)計(jì)中脛骨平臺(tái)處有旋轉(zhuǎn)軸,允許脛骨在縱軸上旋轉(zhuǎn),這樣幫助患者站立時(shí)更好地維持靜態(tài)穩(wěn)定性。而本研究中假體均選用同一家公司產(chǎn)品,除脛骨平臺(tái)處是否有旋轉(zhuǎn)軸外,兩種假體其余部分均相同,故我們可以排除TKA中由于選用假體類型不同而導(dǎo)致的對(duì)關(guān)節(jié)本體感覺(jué)影響。
本研究存在的局限性有:a)我們前瞻性地對(duì)兩種設(shè)計(jì)相似的假體類型進(jìn)行隊(duì)列比較分析。雖然兩組之間年齡、性別、術(shù)前一般臨床特征、術(shù)前關(guān)節(jié)功能等變量均無(wú)明顯差異,但由于本研究中選擇假體時(shí)不能夠嚴(yán)格按盲法執(zhí)行,故前瞻性研究可能未能夠更有效地限制選擇偏倚和其他潛在的混淆變量。b)由于研究樣本量較小,且取95%的可信區(qū)間,故本研究方案可能不能夠有效地識(shí)別兩組患者之間的變量差異性,這樣容易導(dǎo)致Ⅱ型錯(cuò)誤。比較兩組患者術(shù)后發(fā)生的并發(fā)癥時(shí),由于樣本量和并發(fā)癥發(fā)生的數(shù)量較小,且隨訪時(shí)間較短。故我們認(rèn)為還需進(jìn)一步擴(kuò)大樣本量和隨訪時(shí)間,以便研究結(jié)果更為精確。c)本研究由于條件有限,故研究方案較為簡(jiǎn)略。因患者前庭神經(jīng)、視線以及認(rèn)知能力等因素均能夠影響到患者的本體感覺(jué),從而影響到患者維持軀體平衡性能力。本研究未能夠像類似研究中一樣分別對(duì)患者在閉眼和睜眼時(shí)進(jìn)行測(cè)量[16],或?qū)颊唠p下肢分別進(jìn)行單側(cè)下肢站立平衡試驗(yàn)[44],這樣對(duì)患者本體感覺(jué)、術(shù)后軀體穩(wěn)定性變化的分析結(jié)果可能更為精確。d)未能對(duì)患者術(shù)前特點(diǎn)進(jìn)行更詳細(xì)地分類并分析,如術(shù)前不同內(nèi)外翻程度、病程長(zhǎng)短、對(duì)側(cè)膝關(guān)節(jié)情況及其本體感覺(jué)等因素。研究中未對(duì)隨訪期不同階段的患者體重是否有變化及體重變化對(duì)患者軀體中心是否產(chǎn)生相應(yīng)地影響做出更深度地分析。
研究中兩種假體組患者膝關(guān)節(jié)功能及軀體靜態(tài)穩(wěn)定性均較術(shù)前明顯改善,其中PFC-RP組患者較PFC-Sigma組患者軀體穩(wěn)定性變化更為明顯。TKA圍手術(shù)期極為重要,尤其是膝OA患者軀體穩(wěn)定性退變較同年齡段人群更明顯。TKA術(shù)后前幾個(gè)月內(nèi)患者軀體穩(wěn)定性甚至較術(shù)前更弱,故筆者認(rèn)為選用PFC-RP型假體也許能夠有效減少老年患者術(shù)后跌倒摔傷的概率。然而,本研究隨訪時(shí)間較短,至于兩種假體的長(zhǎng)期療效和對(duì)患者關(guān)節(jié)功能恢復(fù)以及軀體穩(wěn)定性的影響需進(jìn)行長(zhǎng)期隨訪,有待進(jìn)一步細(xì)致的研究。
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The Influence of Fixed-bearing and Rotating-platform Total Knee Arthroplasty on Static Body Balance in knee osteoarthritis
Mieralimu Muertizha1,Zhao Wei2,Wang Li2,etal
(1.The Postgraduate School of Xinjiang Medical University,Urumqi 830011,China;2.Department of Joine Surgery,Orthopaedic Center,People′s of Xinjiang,Urum 830011,China)
Objective To compare the static body balance between fixed -bearing total knee arthroplasty (PFC-Sigma) and rotating-platform total knee arthroplasty(PFC-RP) in patients′ who suffered from unilateral knee osteoarthritis.Methods Forty-five patients with single osteoarthritis of right knee who underwent TKA at our department from January 2011 to December 2013 were prospectively analyzed.21consecutive patients were replaced with rotating-platform total knee design (PFC-RP)and the others with fixed-bearing design (PFC-Sigma).The measurements were performed using the corresponding instrument and subjects completed consecutive double-limb standing balance trials for three times.The Medio-lateral displacements and Locus Length of GCP (LG) in unit-time were derived from the instrument.All the patients were evaluated with HSS and complete balance trails pre-operatively,sixth month and one year postoperatively.Clinical outcome complication rates and body static balance were compared.Results The mean GCP in the medio-lateral direction shifted to the operative side in both groups after surgery,there was no significant difference in ML-Xrange between the groups(P>0.05).The value of Locus of GCP(LG) was smaller in PFC-RP group than PFC-Sigma group(P<0.05).Conclusion Our study demonstrated no advantage of the rotating-platform arthroplasty over fixed-bearing arthroplasty with regard to clinical results and complication rates at one year follow-up.However,rotating-platform arthroplasty has a better body static balance than fixed-bearing arthroplasty.
total knee arthroplasty;osteoarthritis;rotating-platform;fixed-bearing;body static balance
新疆維吾爾自治區(qū)研究生科研創(chuàng)新項(xiàng)目基金(XJGRI 2014093);*本文通訊作者:袁宏
1008-5572(2015)01-0020-06
R687.4+2
B
2014-09-11
米爾阿里木·木爾提扎(1988- ),男,醫(yī)師,新疆醫(yī)科大學(xué)研究生學(xué)院,830011。