ORİJİNAL ARAŞTIRMA Experimental Repair of Rabbit Segmental Bone Defects by Using Autologous Bone Marrow and Electrical Stimulation Yusuf GÜRBÜZ, MD, a Fahri ŞAHİN, MD, b Selcen ÖZDEDELİ, MD, c Gülperi ÖKTEM, MD, d Çığır Biray AVCI, e Güray SAYDAM, MD, f Oğuz ÖZDEMİR, MD f a Department of Orthopedic Surgery and Traumatology, EMOT Hospital, Departments of b Hematology, c Physical Therapy and Rehabilitation, d Histology and Embryology, e Medical Biology, f Orthopedic Surgery and Traumatology, Ege University School of Medicine, İzmir Ge liş Ta ri hi/re ce i ved: 13.06.2008 Ka bul Ta ri hi/ac cep ted: 20.07.2009 This study was presented in XXXII. National Hematology Congress, 8-12 November 2006, Antalya. Ya zış ma Ad re si/cor res pon den ce: Fahri ŞAHİN, MD Ege University School of Medicine Department of Hematology, İzmir, TÜRKİYE/TURKEY fahri.sahin@ege.edu.tr ABS TRACT Objective: In this study, we ha ve ai med to in ves ti ga te the po ten ti al ro le of au to lo go us bo ne mar row cell in jec ti on and mus cu lar elec tri cal sti mu la ti on as a se pa ra te and con co mi tant app - li ca ti on on bo ne he a ling in ex pe ri men tal rab bit ul nar seg men tal bo ne de fect mo del. Ma te ri al and Met hods: Forty New-Ze a land rab bits, all over three months of age and we ig hing bet we en 2500 and 3500 grams we re di vi ded in to fo ur gro ups. Fo ur gro ups of rab bits we re the con trol gro up (I), electri cal sti mu la ti on gro up (II), bo ne mar row cells in jec ti on gro up (II I) and bo ne mar row cells in jec ti - on with elec tri cal sti mu la ti on gro up (IV). Bo ne de fect he a ling was eva lu a ted ra di o lo gi cally ac cor ding to the mo di fi ed La ne and Sand hu sco ring system and at the end of the sixth we ek, rab bits we re sacri fi ced and the ir fo re arms we re samp led for his to pat ho lo gi cal in ves ti ga ti on. Results: When one-toone com pa ri son bet we en all gro ups was per for med, de fect he a ling was fo und to be bet ter in Gro ups II, II I, and IV com pa red to Gro up I ba sed on the ra di o lo gi cal and his to pat ho lo gi cal pa ra me ters eva l- u a ted. This eva lu a ti on re ve a led that the he a ling was bet ter in gro ups tre a ted with bo ne mar row cell in jec ti on with or wit ho ut elec tri cal sti mu la ti on as well as in gro up tre a ted with elec tri cal sti mu la ti - on com pa red to the con trol gro up with no tre at ment. Conc lu si on: Au to lo go us bo ne mar row cells with or wit ho ut elec tri cal sti mu la ti on, wo uld be used in he a ling of seg men tal bo ne de fect with an ade qu a te ef fi cacy. Fu tu re stem cell stu di es com bi ned with elec tri cal cur rent are re qu i red to de mons tra te and to con firm that elec tri cal cur rent en han ces in vi vo cel lu lar dif fe ren ti a ti on. Key Words: Frac tu res, bo ne; bo ne mar row cells; elec tric sti mu la ti on ÖZET Amaç: Bu ça lış ma da oto log ke mik ili ği hüc re le ri nin en jek si yo nu ve kas elek trik sel uya rı mı - nın ay rı ay rı ve bir lik te uy gu lan ma sı nın tav şan mo de li üze rin de seg men tal ul nar de fek tin iyi leş me - si ne olan po tan si yel ro lü nü araş tır ma yı amaç la dık. Gereç ve Yöntemler: Üç ay lık tan bü yük ve 2500-3500 gram ağır lı ğın da olan 40 Ye ni Zel lan da tav şa nı dört gru ba ay rıl dı. Bu dört grup (I) kon - trol, (II) elek trik sel uya rı mın ya pıl dı ğı grup, (II I) ke mik ili ği hüc re le ri en jek te edi len grup ve (IV) elek trik sel uya rı ve ke mik ili ği bir lik te uy gu la nan grup tan oluş tu rul du. Kı rık iyi le şi mi mo di fi ye La - ne ve Sand hu skor la ma sis te mi kul la nı la rak rad yo lo jik açı dan ve al tı haf ta so nun da sak ri fi ye edi len tav şan la rın ön kol ör nek le ri nin his to pa to lo jik in ce le me si so nu cu de ğer len di ril di. Bul gu lar: Bü tün grup lar rad yo lo jik ve his to lo jik pa ra met re le re gö re kar şı laş tı rıl dı ğın da, de fekt iyi le şi mi Grup II, II I ve IV de grup I e oran la da ha iyi bu lun du. Bu de ğer len dir me, ke mik ili ği en jek si yo nu ya pı lan gru - bun elek trik sel uya rım ya pı lan ve ya ya pıl ma yan grup ile te da vi ve ril me yen gru ba oran la da ha iyi so nuç ver di ği ni gös ter di. So nuç: Oto log ke mik ili ği, elek trik sel uya rım ol sun ya da ol ma sın ke mik de fekt le ri nin iyi le şi min de et kin şekil de kul la nı la bi lir. Elek trik sel uya rı nın ke mik ili ği hüc re le riy - le et kin li ği nin gös te ril me si ve onay lan ma sı için ye ni kök hüc re ça lış ma la rı yol gös te ri ci ola cak tır. Anah tar Ke li me ler: Ke mik kı rık la rı; ke mik ili ği hüc re le ri; elek trik sel uya rı Turkiye Klinikleri J Med Sci 2010;30(2):623-30 Cop yright 2010 by Tür ki ye Kli nik le ri one defects generally emerge from oncological surgery, following revision arthroplasty, or trauma and are orthopedic problems that are difficult to treat. When it has been proven that bone marrow shows a Turkiye Klinikleri J Med Sci 2010;30(2) 623
Gürbüz ve ark. ca pa ci tan ce cha rac te ris tic of bo ne and used as a percu ta ne o us graft, it is con si de red that it may al so be used for he a ling of de fects. The os te o ge nic po ten ti - al of bo ne mar row is al so de mons tra ted in in-vit ro con di ti ons which in cre a se the in te rest in stu di es on this sub ject. 1,2 Sin ce au to lo go us bo ne mar row in vol - ves a struc tu re with pri mi ti ve os te o ge nic cells rich for cyto ki nes, so me in ves ti ga tors sup port the use of bo ne mar row with au to lo go us and al lo ge ne ic grafts. Con nolly et al. sho wed that bo ne mar row alo ne may re co ver, and they pro vi ded re co very in 18 of 20 ti b- i al non-uni ons with bo ne mar row in jec ti on fol lo - wing in tra-me dul lary sta bi li za ti on. 3 Re cently, au to lo go us bo ne mar row in jec ti on was shown to acce le ra te he a ling in long bo ne non-uni ons. 3-5 The re are many re ports re gar ding the ef fect of dif fe rent types of elec tri cal cur rent on ac ce le ra ti on of frac tu res and de fect re co very; ho we ver, the po si - ti ve ef fects of ne u ro mus cu lar elec tri cal sti mu la ti on on frac tu res and de fect he a ling, pre fer red in the pre - sent study and used mostly in physi ot he rapy cli nics. 6 Burr et al. sho wed that ne u ro mus cu lar elec tri cal sti - mu la ti on in ex tre mi ti es im mo bi li zed using plas ter casts in cre a sed bo ne tur no ver af ter 17 days. 7 Blo om - fi eld et al. sho wed that func ti o nal elec tri cal cur rent the ra pi es ca u sed an in cre a se in bo ne mass. 8 Alt ho - ugh it is not known how ne u ro mus cu lar sti mu la ti - on by elec tri cal cur rent af fects frac tu re he a ling, it is tho ught that it pro vi des he a ling by in cre a sing the pe rip he ral blo od cir cu la ti on, bo ne tur no ver, and exer ting an ef fect on the me sench ymal stem cells by cre a ting a mag ne tic fi eld. 6,9-12 An agent that can be con si de red to in cre a se de fect and frac tu re he a ling sho uld be inert, dis sol - ve and dis so ci a te in the body and the re fo re, it sho - uld be os te o-in duc ti ve and os te o-con duc ti ve. In the pre sent study, it has be en in ves ti ga ted whet her the we ak os te o-con duc ti ve ef fect of bi o-inert bo ne mar row may be in cre a sed or not by ne u ro mus cu lar elec tri cal cur rent in bo ne de fects ex pe ri men tally cre a ted in rab bits ul nas, and the ir cli ni cal ef fects ha ve be en ob ser ved. MA TE RI AL AND MET HODS Forty New-Ze a land rab bits, all over three months of age and we ig hing bet we en 2500 and 3500 grams Ortopedi ve Travmatoloji we re di vi ded in to fo ur gro ups: Gro up I: only the de fect-in du ced gro up, Gro up II: Gro up re ce i ved elec tri cal cur rent af ter de fect in duc ti on, Gro up II - I: Gro up in jec ted bo ne mar row af ter de fect in duc - ti on, and Gro up IV: Gro up re ce i ved elec tri cal cur rent and bo ne mar row af ter de fect in duc ti on. All ex pe ri ments we re per for med in comp li an ce with the re le vant sci en ti fic lo cal laws and ins ti tu - ti o nal gu i de li nes af ter ob ta i ning per mis si on from lo cal ani mal et hics com mit te e, and all pro ce du res we re per for med ac cor ding to gu i de for the Ca re and Use of La bo ra tory Ani mals prin cip les. Fol lo wing lo cal ste ri li za ti on with po vi do ne iodi ne so lu ti on on left up per ex tre mi ti es of rab bits, a 0.8-1 cm de fect are a from the di aph ysis of one third midd le ul na was ex trac ted with its pe ri os te um. The sur gi cal fi eld was was hed with iso to nic saline solu ti on (%0.9 NaCl) and bo ne deb ris was was hed away. The skins of all fo ur gro ups we re su tu red wit ho ut any ot her in ter ven ti ons. The first gro up of rab bits we re left to nor mal ac ti vi ti es wit ho ut app li ca ti on of any pro ce du res. Rab bits in the se cond gro up we re con nec ted to elec tro des be gin ning on the fo urth day of sur gery, le a ving the ex tre mity sur gery-fre e, one elec tro de 1 cm dis tal to the el bow jo int on the an te ri or part, and the ot her one 1 cm pro xi mal to the wa ist jo int pos te ri orly. An Elec tro form Me di cal 12 ins tru ment with 25 ma amp li tu de, 50 µm wa ve length and 40Hz fre qu ency was used to de li ver bip ha sic electri cal cur rent for an ho ur per day. All rab bits in the se gro ups re ce i ved se da ti ves du ring ex po su re to the elec tri cal cur rent. Rab bits we re left to nor mal da ily ca ge ac ti vi ti es on the ot her days. On the fo urth day af ter sur gery, bo ne mar rows of the rab bits in the third gro up we re as pi ra ted with he pa rin-was hed in jec tors 1.5-2 ml from the right dis tal fe mur. One drop a ti me was ta ken on the sli de and was con fir med to con ta in bo ne marrow mac ros co pi cally and was lo o king for un der the mic ros co pe be fo re a per cu ta ne o us in jec ti on of 1 ml as pi ra te. The fo urth gro up re ce i ved bo ne mar row and re ce i ved elec tri cal cur rent as des cri bed pre vi o usly. The rab bits we re ob ser ved for six we eks con ti nu ing 624 Turkiye Klinikleri J Med Sci 2010;30(2)
Orthopedics and Traumatology the ir da ily ca ge ac ti vi ti es. At the end of the sixth we ek, rab bits, se ven in each gro up, we re sac ri fi ced and the ir fo re arms we re samp led for his to pat ho lo - gi cal in ves ti ga ti on. RA DI OG RAP HIC EVA LU A TI ON Ra di og rap hic eva lu a ti on of ul nar de fect was perfor med ac cor ding to the mo di fi ed La ne and Sand - hu scor ring system (Tab le 1). 13 Ac cor ding to the es tab lis hed sco ring system, third and sixth we ek radi og rap hs we re eva lu a ted ba sed on 10 po ints. All the X-rays we re ta ken by using the sa me vi su a li za - ti on system by the sa me tech ni ci an. Ra di og rap hic analy ses we re per for med by an in de pen dent ra di - o lo gist blinded, wit ho ut any in for ma ti on re gar ding the pro ce du res and gro ups. HIS TO LO GI CAL EVA LU A TI ON Tis su e Pro ces sing, His to logy, and His to morp ho metry The ul nar bo nes of rab bits we re cut 5 mm dis tal to de fect are a. Fol lo wing the fi xa ti on and de cal ci - fi ca ti on pro ce du re, bo ne samp les we re dehy dra ted in high deg re e al co hol, was hed with xyle ne and em bed ded in pa raf fin be fo re be ing cut with a mic - ro to me RM 2145 (Le i ca GmbH, Wetz lar). Lon gi tu - di nal sec ti ons of 3 μm thick ness from each ul na we re ob ta i ned and spre ad on glass sli des co ve red with poly-l-lysin and the sec ti ons we re dyed with he ma toxy le ne eo sin. The can cel lo us bo ne of ul na Gürbüz et al was exa mi ned un der the light mic ros co pe for bo ne his to morp ho metry (Oly mpus BX-51 light mic ros - co pe and Oly mpus C-5050 di gi tal ca me ra, Oly mpus Eu ro pa GmbH, Ger many). The re sults we re compa red with the Ima ge-pro Ex press analy sis soft wa - re (Me di a-cyber ne tics, 2002, USA). No menc la tu re and symbols used in con ven ti o nal bo ne his to - morp ho metry we re the sa me as tho se used by Par - fitt et al. 14 His to morp ho lo gi cal pa ra me ters we re eva lu a ted as fol lows; To tal tis su e are a (Tt. Ar, µm 2 ), To tal tra be cu lar are a (Tb. Ar, µm 2 ), Tra be cu lar pe ri me ter (Tb.Pm, lµm) was me - a su red, Can cel lo us bo ne sur fa ce (BS= Tb.Pm, µm), Can cel lo us bo ne vo lu me (BV/TV= Tb.Ar/ Tt.Ar, %), Tra be cu lar thick ness [Tb.Th= (BV/TV)/0.5 BS, µm)], Tra be cu le num ber [Tb.N= (BV/TV)/Tb.Th, mm -1 ], Tra be cu lar spa ce [Tb.Sp= (1/TbN)-Tb. Th. µm] was cal cu la ted. STA TIS TI CAL ANALY SES Sta tis ti cal analy sis of ra di o lo gi cal pa ra me ters was per for med using SPSS Soft wa re re le a se 13.0 for TABLE 1: Modified Lane ve Sandhu scorring system. Bone formation Total point possible per category No evidence of bone formation 0 Bone formation 4 Bone formation occupying 25% of defect 1 Proximal union 2 Bone formation occupying 50% of defect 2 Distal union 2 Bone formation occupying 75% of defect 3 Remodelling 2 Full gap bone formation 4 Maximum score 10 Union Nonunion 0 Possible union 1 Radiographic union 2 Remodelling No evidence of remodelling 0 Remodelling of medullary canal 1 Full remodelling of cortex 2 Turkiye Klinikleri J Med Sci 2010;30(2) 625
Gürbüz ve ark. Win dows (Apac he Sof wa re Fo un da ti on, Chi ca go, USA). Wil co xon Test, Krus ka l Wal lis Test,Man n W hit ney U Test, One-way ANO VA Bon fer ro ni s Mul tip le Com pa ri son Tests we re per for med in the eva lu a ti on for ra di og rap hi cal analy sis. For his to - pat ho lo gi cal eva lu a ti on, the col lec ted da ta was used for in tra- and in ter-gro up com pa ri sons by using the One-way ANO VA with Bon fer ro ni mul tip le compa ri son test and the sta tis ti cal analy sis was per for - med using the Graph Pad Ins tat 3.05 soft wa re (Graph Pad Soft wa re Inc., San Di e go, CA, USA). RE SULTS When one-to-one com pa ri son bet we en Gro ups I, II, II I, and IV was ma de, de fect he a ling was fo und to be bet ter in Gro ups II, II I, and IV com pa red to Gro up I ba sed on the eva lu a ted ra di o lo gi cal and his to pat ho lo gi cal pa ra me ters (p< 0.05). EVA LU A TI ON OF RA DI O LO GI CAL CHAN GES AND THE COM PA RI SON OF THE GRO UPS AC COR DING TO RA DI O LO GI CAL EVA LU A TI ON Ra di o lo gi cal sta tis ti cal analy sis was per for med with the SPSS Soft wa re re le a se 13.0 for Win dows (Apac- he Sof wa re Fo un da ti on, Chi ca go, USA) Firstly, ingro up analy sis of bo ne graphs we re per for med and eva lu a ted. Ra di o lo gi cal analy sis of Gro up I wit ho - ut any tre at ment re ve a led that the re was no im pro - ve ment in the bo ne he a ling ba sed on eit her each ca se or the sum of the who le gro up (Tab le 2a, Fi g- u re 1a). Gro ups II, III and IV we re al so eva lu a ted with res pect to ra di o lo gi cal sta tus and sig ni fi cant im pro ve ment in bo ne he a ling was do cu men ted for eit her each ca ses in gro ups or for who le gro ups in in-gro up analy ses (Tab le 2b,c,d; Fi gu re 1b,c,d). No sig ni fi cant dif fe ren ce was ob ser ved in Gro up I bet we en the third and sixth we ek va lu es for de fect he a ling (p> 0.05). The re was a sig ni fi cant dif fe ren - ce in Gro ups II, II I, and IV bet we en the third and sixth we ek va lu es for de fect he a ling (p< 0.05) (Gro- up II p= 0.024, Gro up III p= 0.026, Gro up IV p= Ortopedi ve Travmatoloji 0.026). When all gro ups we re eva lu a ted to get her, the re was no dif fe ren ce bet we en gro ups ac cor ding to third we ek de fect he a ling (H= 5.065, p= 0.167), on the ot her hand the re was a sig ni fi cant dif fe ren - ce bet we en gro ups ac cor ding to sixth we ek de fect he a ling (H= 12.675, p= 0.005). Pa i red com pa ri son of the gro ups with res pect to ra di o logy was sum ma ri zed as fol lows; The re we re a sig ni fi cant dif fe ren ce bet we en Gro up I and II (p= 0.026, p< 0.05), Gro up I and III (p= 0.017, p< 0.05), Gro up I and IV (p= 0.001, p< 0.05). Ho we ver the re we re no dif fe ren ces bet we - en Gro up II, II I, and IV (p> 0.05). EVA LU A TI ON OF HIS TO LO GI CAL CHAN GES AND THE COM PA RI SON OF THE GRO UPS AC COR DING TO HIS TO PAT HO LO GI CAL EVA LU A TI ON The col lec ted da ta was used for in tra- and in tergro up com pa ri sons using the One-way ANO VA with Bon fer ro ni mul tip le com pa ri son test and the sta tis ti cal analy sis was per for med using the Graph- Pad Ins tat 3.05 soft wa re (Graph Pad Soft wa re Inc., San Di e go, CA, USA). His to pat ho lo gi cal analy sis of de fect are as we - re per for med at the 6 th we ek of the ex pe ri ment af - ter sac ri fi cing the rab bits. Samp les we re ob ta i ned and tre a ted as des cri bed in material met hods sec ti - on. All samp les from each gro up we re analy zed and the me ans of gro ups was used for com pa ri son. Cancel lo us bo ne vo lu me ra ti os we re fo und as 21.40%, 50.80%, 50.40% and 50; 20% in con trol gro up, elec tri cal sti mu la ti on gro up, bo ne mar row in jec ti - on gro up and elec tri cal sti mu la ti on plus bo ne marrow in jec ti on gro up, res pec ti vely. Tra be cu lar thick nes ses we re fo und as 84.25 mm, 128.80 mm, 127.3 mm and 130.8 mm in con trol gro up, elec tri - cal sti mu la ti on gro up, bo ne mar row in jec ti on gro - up and elec tri cal sti mu la ti on plus bo ne mar row in jec ti on gro up, res pec ti vely. Tra be cu le num bers in he a ling are as we re fo und as 2.75, 5.25, 5.0, and TABLE 2a: Group I: Radiological evaluation of the group I with only defect induction. Control 1 Control 2 Control 3 Control 4 Control 5 Control 6 Control 7 Third week 4 1 1 1 5 3 3 Sixth week 5 1 1 7 6 4 3 626 Turkiye Klinikleri J Med Sci 2010;30(2)
Orthopedics and Traumatology Gürbüz et al the ot her hand, the re we re no dif fe ren ces bet we en Gro ups II, III and IV (p> 0.05). FIGURE 1a: Radiological controls of Group I on the surgery day, third and sixth week. 5.0 in con trol gro up, elec tri cal sti mu la ti on gro up, bo ne mar row in jec ti on gro up and elec tri cal sti mu - la ti on plus bo ne mar row in jec ti on gro up, res pec ti - vely. Tra be cu lar spa ces we re me a su red as 71.50 mm, 122.0 mm, 122.5 mm and 125.3 mm in control gro up, elec tri cal sti mu la ti on gro up, bo ne marrow in jec ti on gro up and elec tri cal sti mu la ti on plus bo ne mar row in jec ti on gro up, res pec ti vely (Tab le 3). When can cel lo us bo ne vo lu me (BV/TV= Tb.Ar/Tt.Ar, %), tra be cu lar thick ness [Tb.Th= (BV/TV)/0.5 BS, µm)], tra be cu le num ber [Tb.N= (BV/TV)/Tb.Th, mm -1 ] and tra be cu lar spa ce va lu - es we re com pa red in all gro ups, the re sults we re sum ma ri zed as fol lows and il lus tra ted in Figures 2a-d. The re we re sig ni fi cant dif fe ren ces bet we en Gro ups I and II, I and II I, I and IV (p< 0.001). On DIS CUS SI ON Seg men tal bo ne de fect is one of the ort ho pe dic prob lems that cons tra in the cli ni ci an. Au tog raf ting or al log raf ting, as the most com monly uti li zed tre - at ment met hod re cently, ha ve cre a ted so me problems. The re fo re, the re ha ve be en tre men do us ef forts to de ve lop new met hods. Al lo ge ne ic or auto lo go us stem cells in jec ti on, mus cu lar elec tri cal sti mu la ti ons are in no va ti ve examp les of the se inter ven ti ons. Fri e dens te in et al. de mons tra ted that alt ho ugh he ma to po i e tic cells di e in in-vit ro con di - ti ons in bo ne mar row as pi ra tes, fib rob last pre cur - sors sur vi ve and con ti nu e to ge ne ra te bo ne tis su e which ref lec ted the os te o ge nic po ten ti al of bo ne mar row. 1 Bo ne mar row as pi ra tes may be ea sily ino cu la ted to the de fect are a by using a 14-ga u ge Jam-Shi di ne ed le. In this ea sily har ves ted and practi cally app li ed met hod, os te o ge nic ac ti vity of bo ne mar row co uld be ma in ta i ned wit ho ut des truc ti on un li ke bo ne grafts. 15 It has be en shown that, in 1 ml of each 4 ml bo ne as pi ra tes, the re were ade qu - a te pre cur sor cells with high os te o ge nic po ten ti al. 16 The ir use in cli ni cal tre at ment of non-uni ons be - gan with Con nolly et al. who tre a ted 10 ti bi al fractu res with non-uni on by bo ne mar row in jec ti ons. 3 TABLE 2b: Group II: Radiological evaluation of the group with only electrical current (EC) application after defect induction. EC1 EC2 EC3 EC4 EC5 EC6 EC7 Third week 3 5 3 4 6 5 7 Sixth week 5 7 5 7 7 7 7 TABLE 2c: Group III: Radiological evaluation of the group with only bone marrow (BM) injection after defect induction. BM 1 BM 2 BM 3 BM 4 BM 5 BM 6 BM 7 Third week 7 7 6 4 1 2 3 Sixth week 8 8 8 6 3 8 7 TABLE 2d: Group IV: Radiological evaluation of the group with both electrical current and bone marrow application after defect induction. EC+BM1 EC+BM2 EC+BM3 EC+BM4 EC+BM5 EC+BM6 EC+BM7 Third week 4 3 5 5 3 4 4 Sixth week 7 8 9 8 7 7 7 Turkiye Klinikleri J Med Sci 2010;30(2) 627
Gürbüz ve ark. Ortopedi ve Travmatoloji FIGURE 1b: Radiological controls of Group II on the surgery day, third and sixth week. FIGURE 1c: Radiological controls of Group III on the surgery day, third and sixth week. The re are many stu di es de mons tra ting that bo ne mar row may al so be used suc cess fully in ac ce le ra ting frac tu re he a ling be si des non-uni on tre at ment. It is al so be li e ved that im me di a te app li - ca ti on of bo ne mar row ac ce le ra tes bo ne he a ling with os te o ge nic pre cur sor cells and the growth factors it inc lu des. 17-20 Be si des, as it is easy to apply and has no comp li ca ti ons, it is a suc cess ful al ter na ti ve tre at ment met hod in non-uni on of long bo nes. The re is not much in for ma ti on abo ut the app - li ca ti on of bo ne mar row in com bi na ti on with anot - her met hod for seg men tal de fects. In the pre sent study, de fects in the bo ne mar row-app li ed gro up im pro ved fas ter and cal lus for ma ti on was of hig her deg re e than in the con trol gro up. This is con sis tent with the li te ra tu re. Bo ne mar row in cre a sed he a ling at a hig her deg re e than the con trol gro up, even in lar ge de fects. In the li te ra tu re re vi ew, the re are app li ca ti ons such as cell imp lan ta ti on fol lo wing bo - ne mar row cen tri fu ga ti on. Anot her ad van ta ge of who le bo ne mar row trans plan ta ti on in our study is that this met hod supp li es ad di ti o nally so me stromal growth fac tors, in cre a sing the os te o ge nic effect. FIGURE 1d: Radiological controls of Group IV on the surgery day, third and sixth week. The use of elec tri cal cur rent for frac tu re and de fect he a ling be gan with Fri e den berg and Brigh - ton (1960), de mons tra ting that bi o e lec tric po ten ti - als of cells in the bo ne de pend on cel lu lar che mi cal gra di ent and that they im pro ved he a ling cli ni - cally. 21,22 In the li te ra tu re re vi ew, we co uld not find any ot her re ports on the ef fects of ne u ro mus cu lar elec tri cal sti mu la ti on in bo ne he a ling. Ne u ro mus cu lar elec tri cal sti mu la ti on app li ed on ex pe ri men tal sub jects is cli ni cally used for dec - re a sing ede ma, in cre a sing musc le strength and protec ting musc le to ne in pa ti ents im mo bi li zed af ter in jury or ope ra ti on. In di rect and di rect mec ha nisms TABLE 3: Histomorphometry results for each group; mean and standard deviation values of cancellous bone surface (BS= Tb.Pm, µm), cancellous bone volume (BV/TV=Tb.Ar/Tt.Ar, %), trabecular thickness [Tb.Th= (BV/TV)/0.5 BS, µm)], trabecule number [Tb.N=(BV/TV)/Tb.Th, mm -1 ], trabecular space [Tb.Sp= (1/TbN)-Tb.Th. µm] were illustrated. Control Electrical Stimulation Bone Marrow EC and BM BV/TV (%) 21.40 ± 1.69* 50.80 ± 1.16* 50.40 ± 1.86* 50.20 ± 0.58* Tb.Th (µm) 84.25 ± 5.76** 128.80 ± 2.53** 127.3 ± 2.06** 130.8 ± 1.25** Tb.N (mm -1 ) 2.75 ± 0.75** 5.25 ± 0.48** 5.0 ± 0.58** 5.0 ± 0.41** Tb.Sp (µm) 71.50 ± 3.80** 122.0 ± 3.98** 122.5 ± 4.50** 125.3 ± 3.77** All values were given as mean ± SD.* P< 0.05, **P< 0.01. 628 Turkiye Klinikleri J Med Sci 2010;30(2)
Orthopedics and Traumatology Gürbüz et al FIGURE 2a: Comparison of cancellous bone volume (BV/TV= Tb.Ar/ Tt.Ar, %) between groups. FIGURE 2b: Comparison of trabecular thickness [Tb.Th= (BV/TV)/0.5 BS, µm)] between groups. FIGURE 2c: Comparison of trabecular number [Tb.N= (BV/TV)/Tb.Th, mm -1 ] between groups. FIGURE 2d: Comparison of trabecular space [Tb.Sp = (1/TbN)-Tb. Th. µm] between groups. are con si de red in cli ni cal ef fects of ne u ro mus cu lar elec tri cal sti mu la ti on. As a di rect ef fect, con se cu ti - ve musc le con trac ti ons are tho ught to in cre a se blo - od fil ling in the vas cu lar bed, in cre a se vas cu lar per me a bi lity, ac ce le ra te ve no us re turn, and in cre a - se ne o vas cu la ri za ti on. Be si des the se ef fects of the elec tri cal cur rent, it is al so known that it in cre a ses os te ob last for ma ti on from me sench ymal stem cells di rectly, which pro mo tes os te o ge ne sis. 9,11,23-29 Alt - ho ugh this ef fect is tho ught to be li mi ted in ne u ro - mus cu lar elec tri cal sti mu la ti on, a 1 cm in ter val bet we en elec tro des and bo ne frag ments may ca u se a mag ne tic ef fect. As an in di rect ef fect, it was tho - ught that it en han ced vas cu lar flow and in cre a sed me ta bo lic ac ti vity, and im pro ved bo ne den sity by mi ni mal mo ve ments on frac tu re li nes. In the li te - ra tu re, ne u ro mus cu lar elec tri cal sti mu la ti on app li - ed on a 3 mm ti bi al de fect im pro ved frac tu re he a ling. In our study, it is ob ser ved that ne u ro mus - cu lar elec tri cal cur rent in cre a sed frac tu re he a ling even in lar ger de fects. Ho we ver, it sho wed no advan ta ge when com pa red with Gro up II I, which was the bo ne mar row-in jec ted gro up. In his to lo gi cal inves ti ga ti ons, a hig her ra te of vas cu la ri za ti on than in ot her gro ups sug ges ted that the ac ce le ra ti ve ef fect of ne u ro mus cu lar elec tri cal sti mu la ti on on de fect he a ling de pended on in cre a sed lo cal blo od flow and ve no us re turn, rat her than pre ci pi ta ting stem cell dif fe ren ti a ti on (da ta not shown). Alt ho ugh the re are many ex pe ri men tal and cli ni cal stu di es re la ted with the use of au to lo go us bo ne mar row and elec tri cal cur rent on frac tu re and de fect he a ling se pa ra tely, to our know led ge, the re are no re ports using the se met hods in com bi na ti - on. In the gro up in which elec tri cal cur rent and bo ne mar row injection we re com bi ned, he a ling Turkiye Klinikleri J Med Sci 2010;30(2) 629
Gürbüz ve ark. Ortopedi ve Travmatoloji star ted ear li er than in the con trol gro up and his to - lo gi cally the re was mo re cal lus tis su e; ho we ver, the dif fe ren ce was not sig ni fi cant. The shor test fol lowup for de fect he a ling is eight we eks in the li te ra tu - re. In the light of this in for ma ti on; we draw a conc lu si on that stu di es with com bi ned mar ked cell cul tu re and elec tri cal cur rent, and a fol low-up peri od lon ger than six we eks are ne e ded. Use of ne u - ro mus cu lar elec tri cal cur rent and bo ne mar row are pro mi sing for cli ni cal ef fects on non-uni on, fractu re and ac ce le ra ting he a ling. Fu tu re stem cell stu - di es com bi ned with elec tri cal cur rent may be used to de mons tra te and to con firm that elec tri cal current en han ces in vi vo cel lu lar dif fe ren ti a ti on. 1. Fri e dens te in AJ, Pet ra ko va KV, Ku ro le so va AI, Fro lo va GP. He te ro to pic of bo ne mar row. 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