High tibial osteotomy with human umbilical cord blood-derived mesenchymal stem cells implantation for knee cartilage regeneration

BACKGROUND High tibial osteotomy(HTO)is a well-established method for the treatment of medial compartment osteoarthritis of the knee with varus deformity.However,HTO alone cannot adequately repair the arthritic joint,necessitating cartilage regeneration therapy.Cartilage regeneration procedures with concomitant HTO are used to improve the clinical outcome in patients with varus deformity.AIM To evaluate cartilage regeneration after implantation of allogenic human umbilical cord blood-derived mesenchymal stem cells(hUCB-MSCs)with concomitant HTO.METHODS Data for patients who underwent implantation of hUCB-MSCs with concomitant HTO were evaluated.The patients included in this study were over 40 years old,had a varus deformity of more than 5°,and a full-thickness International Cartilage Repair Society(ICRS)grade IV articular cartilage lesion of more than 4 cm2 in the medial compartment of the knee.All patients underwent second-look arthroscopy during hardware removal.Cartilage regeneration was evaluated macroscopically using the ICRS grading system in second-look arthroscopy.We also assessed the effects of patient characteristics,such as trochlear lesions,age,and lesion size,using patient medical records.RESULTS A total of 125 patients were included in the study,with an average age of 58.3±6.8 years(range:43-74 years old);95(76%)were female and 30(24%)were male.The average hip-knee-ankle(HKA)angle for measuring varus deformity was 7.6°±2.4°(range:5.0-14.2°).In second-look arthroscopy,the status of medial femoral condyle(MFC)cartilage was as follows:73(58.4%)patients with ICRS grade I,37(29.6%)with ICRS grade II,and 15(12%)with ICRS grade III.No patients were staged with ICRS grade IV.Additionally,the scores[except International Knee Documentation Committee(IKDC)at 1 year]of the ICRS grade I group improved more significantly than those of the ICRS grade II and III groups.CONCLUSION Implantation of hUCB-MSCs with concomitant HTO is an effective treatment for patients with medial compartment osteoarthritis and varus deformity.Regeneration of cartilage improves the clinical outcomes for the patients.

Impact of medial open-wedge high tibial osteotomy for medial compartment osteoarthritis of the knee

BACKGROUND Most populations worldwide,who are used to squatting and sitting cross-legged for their activities of daily living,largely comprise the lower socioeconomic strata,thus making them candidates for exclusion for total knee arthroplasty.Proximal/high tibial osteotomy(HTO)is a preferred strategy for clinically symptomatic osteoarthritis(OA)with genu varum due to painful medial compartment OA which is not amenable to conservative measures.AIM To evaluate the outcomes of medial open-wedge HTO along with autologous bone grafting and buttress plate for the treatment of genu varum due to OA of the knee in a rural population of central India.METHODS A total of 65 knees in 56 patients with a mean age of 58.22±5.63 years with genu varum due to intractable painful knee OA were treated with medial open-wedge HTO along with autologous bone grafting and buttress plate osteosynthesis from June 2015 to May 2018.The mean preoperative radiological angle of genu varum was 13.4°.Clinical outcomes were assessed by the range of movement,knee scores,pain scores,and functional scores.Radiographic studies were performed preoperatively and at regular intervals during the follow-up period.RESULTS All patients reported pain relief immediately after the osteotomy and during the long-term analysis covering between one to three years.The genu varum angle was overcorrected to approximately four degrees in all patients.There was a loss of reduction by approximately three degrees in all patients at around six weeks postoperatively.Preoperative knee movements were restored in all patients.No major perioperative complications were noted during surgery and postoperative follow-up and the clinical scores were significantly improved during the final analysis which revealed good pain relief.CONCLUSION Medial open-wedge HTO is a reliable,safe,practical,physiological,and feasible treatment for populations who are used to increased activity in their occupation and lifestyle and is associated with excellent short-term and long-term results for OA in genu varum knees.

Osteotomy combined with anterior cruciate ligament reconstruction for anterior cruciate ligament injury and biplanar deformity

BACKGROUND It has been confirmed that the increased posterior tibial slope over 12 degrees is a risk factor for anterior cruciate ligament injury,and varus deformity can aggravate the progression of medial osteoarthritis.AIM To evaluate the efficacy of modified high tibial osteotomy(HTO)and anterior cruciate ligament reconstruction(ACLR)in the treatment of anterior cruciate ligament(ACL)injuries with varus deformities and increased posterior tibial slope(PTS)based on clinical and imaging data.METHODS The patient data in this retrospective study were collected from 2019 to 2021.A total of 6 patients were diagnosed with ACL injury combined with varus deformities and increased PTS.All patients underwent modified open wedge HTO and ACLR.The degree of correction of varus deformity and the PTS was evaluated by radiography and magnetic resonance imaging.RESULTS All 6 patients(6 knee joints)were followed up for an average of 20.8±3.7 months.The average age at surgery was 29.5±3.8 years.At the last follow-up,all patients resumed competitive sports.The International Knee Documentation Committee score increased from 50.3±3.1 to 87.0±2.8,the Lysholm score increased from 43.8±4.9 to 86±3.1,and the Tegner activity level increased from 2.2±0.7 to 7.0±0.6.The average movement distance of the tibia anterior translation was 4.8±1.1 mm,medial proximal tibial angle(MPTA)was 88.9±1.3°at the last follow-up,and the PTS was 8.4±1.4°,both of which were significantly higher than those before surgery(P<0.05).CONCLUSION Modified open wedge HTO combined with ACLR can effectively treat patients with ACL ruptures with an associated increased PTS and varus deformity.The short-term effect is significant,but the long-term effect requires further follow-up.

Application of 3D printed patient-specific instrumentation in distal tibial tuberosity-high tibial osteotomy

Objective:To observe the clinical efficacy and advantages of 3D printed patient-specific instrumentation(PSI)assisted distal tibial tuberosity-high tibial osteotomy in the treatment of medial compartment knee osteoarthritis.Methods:75 patients with medial compartment knee osteoarthritis were included in the study performed DTT-HTO in our hospital from August 2017 to August 2019.The patients were divided into the PSI group(n=39)and conventional group(n=36)According to whether PSI was used in surgery.The differences of lateral cortical fracture rate,time of intraoperative X-ray exposure,intraoperative blood loss,operative time,weight bearing line(WBL),Posterior tibial slope(PTS)and Caton-Deschamps index(CDI)were compared between the two groups.Visual analogue scale(VAS)scores and Hospital for Special Surgery(HSS)scores were recorded to evaluate knee pain and function before surgery and after surgery at 3 months and 12 months.Results:All 75 patients were followed up for more than 12 months,the ranged from 12-26(18.74±6.21)months.Three lateral cortical fractures in the conventional group and no fracture in PSI group.The lateral cortical fracture rate,time of intraoperative X-ray exposure,intraoperative blood loss,operative time in PSI group were lower than those in conventional group(p敿0.05).WBL in two groups were significantly improved after surgery(p敿0.05),and PTS,CDI were no statistically improved after surgery(p>0.05).While there was no statistically significant difference with WBL,PTS and CDI between two groups(p>0.05).At 1 months,3 months and 12 months after surgery;VAS and HSS scores in both groups were significantly improved compared with that before surgery(p0.05),and were no statistically significant difference between two groups.Conclusion:3D printed patient-specific instrumentation assisted DTT-HTO has significant clinical efficacy,and effectively standardized surgical procedures,meanwhile reduced the time of intraoperative X-ray exposure,intraoperative blood loss and risk of lateral cortical fracture.

Proximal tibial osteotomy for genu varum:Radiological evaluation of deformity correction with a plate vs external fixator

BACKGROUND High tibial osteotomy(HTO)is a well-known procedure for the correction of knee varus.The purpose of this study was to compare the radiological results and accuracy of deformity correction performed using two different techniques:acute opening wedge correction using a plate and gradual correction with a monolateral external fixator.AIM To compare of the radiological results of two different techniques:acute opening wedge correction(a plate and screw)and gradual correction(external fixator).METHODS A total of 43 patients with plates and 36 patients with external fixators were included.All patients had moderate uniplanar varus deformities.We measured radiographic parameters,including the mechanical axis deviation(MAD),medial proximal tibial angle(MPTA),Caton-Deschamps Index(CDI),posterior proximal tibial angle,and joint line obliquity angle(JLOA).The accuracy of MAD correction was calculated based on a correction goal of neutral or overcorrection for medial compartment arthritis.RESULTS Demographics including age,body mass index,sex,and preoperative deformities were similar between the groups.The MAD significantly improved from 23.6 mm medial to the midline(SD=8.2 mm)to 6.9 mm lateral to the midline(SD=5.4 mm)(P<0.001).The accuracy of MAD correction did not differ between the groups and was 96.1%(SD=8.1%)in the plate group and 98.2%(SD=5.2%)in the external fixator group(P=0.18).The MPTA significantly improved from 83.9°(SD=2.9°)to 90.9°(SD=3.3°)(P<0.001),and the change was similar between the groups.Differences were noted in patella height,with a CDI change of-19.2%(SD=13.7%)and 3.1%(SD=8.0%)for the plate and external fixator groups,respectively(P<0.001).The change in JLOA was 1.6 degrees(SD=1.1 degrees)and 0.9 degrees(SD=0.9 degrees)for the plate and external fixator groups,respectively(P=0.04).CONCLUSION Reliable correction of moderate varus alignment was achieved with both the acute opening wedge technique with a plate and the gradual monolateral external fixator technique.The patellar height decreased with the open wedge plate technique.Joint line obliquity decreased to a greater degree with the open wedge plate technique,perhaps as a result of medial collateral ligament release.The appropriate technique should be selected based on surgeon and patient preferences;however,external fixation may be a better choice when the preservation of patellar height is deemed important.

Proximal fibular osteotomy:Systematic review on its outcomes

BACKGROUND The morbidity and burden of knee osteoarthritis affecting millions of lives worldwide has created a constant pursuit in finding the ideal treatment for knee osteoarthritis.There has been a paradigm shift in the surgical treatment of osteoarthritis ever since the initial description of Volkmann’s tibial osteotomy.This review focuses on one such recent procedure,the proximal fibular osteotomy(PFO)for medial compartment knee osteoarthritis.This review encompasses the history,evidence,risk factors,outcomes and technical considerations of PFO.AIM To understand the evidence and its techniques,and whether this could be an alternative solution to the problem of knee osteoarthritis in the developing world.METHODS The phrases“proximal fibular osteotomy”and“knee osteoarthritis”were searched(date of search December 20,2019)on PubMed to identify articles evaluating the biomechanical and clinical outcomes of PFO in patients with knee osteoarthritis.A total of 258 were retrieved.After reviewing the summary of the texts,22 articles written in English were marked for abstract review.Articles that were case studies or cadaver experiments were excluded.The abstracts of the remaining articles were read,and only those that focused on the history,outcomes of case studies and technical considerations of PFO were included in the review.A total of 12 articles were included in this review.RESULTS At least six studies reported improvement in the visual analogue scale(VAS)from the average preoperative VAS score[6.32,95%confidence interval(CI)=(4.05,8.59)]to average postoperative VAS score[1.23,95%CI:(-1.20,3.71)],which was statistically significant.Similarly,the American Knee Society Score(KSS)functional score improved from an average preoperative KSS functional score[43.11,95%CI:(37.83,48.38)]to postoperative KSS functional score[66.145,95%CI:(61.94,70.35)],which was statistically significant.The femorotibial angle improved by around 7º,and the hip knee ankle angle improved by around 6º.CONCLUSION With the existing data,it seems that PFO is a viable option for treating medial joint osteoarthritis in selected patients.Long term outcome studies and progression of disease pathology are some of the important parameters that need to be addressed by use of multicenter randomized controlled trials.

A long-term follow-up study of high tibial osteotomy for medial compartment osteoarthrosis

Objective: To observe the long-term outcome of high tibial osteotomy (HTO) in treating medial compartment osteoarthrosis of knees. Methods: A retrospective study was carried out on 194 patients (215 knees) treated with HTO for medial compartment osteoarthritis at the Orthopaedic Hospital of Kiel University between 1985 and 1996. Results: One hundred and sixty-one knees (144 patients) were followed up for (1.5)-12 years with an average of (7.5) years and their data were reviewed. The proportion of excellent outcome were (97.3)%, (93.6)% and (78.2)% two, five and over five years after HTO, respectively. The revision rate of total knee arthroplasty (TKA) was (11.8)% (19 knees retreated with TKA for HTO failure). The survivorship analysis of the 19 knees retreated with TKA showed an expected survival rate of (98.7%), (95.0%) and (84.1)% 2, 5 and 10 years after HTO, respectively. There were (5.6)% complications (12 /161), including five superficial wound infections, one deep infection, five delayed bone healing, and one peroneal nerve palsy. Fifty patients (54 knees) missed follow-up, among them 10 patients (11 knees) died.Conclusions: HTO is an effective method in treating medial compartment osteoarthritis with a varus knee. Appropriate overcorrection of femorotibial alignment is the key for the success of the operation. But as the long-term effect is concerned, there is a trend of deterioration and some of the patients may have a second operation of revision with TKA.

Using a Patient-Specific 3D-Printed Surgical Guide for High Tibial Osteotomy:A Technical Note

Patient-specific instrumentation(PSI)enables a more accurate alignment of the lower limbs in a high tibial osteotomy(HTO)than in traditional surgery;however,the current design of commercial PSIs is not perfect.Therefore,we designed a new patient-specific surgical guide to improve the accuracy of the osteotomy and verified its reliability through a clinical operation.Here,we describe a patient with isolated medial-compartment bilateral knee osteoarthritis,accompanied by a varus deformity of the proximal tibia.The patient was treated with HTO using a patient-specific 3D-printed surgical guide.We concluded that the patient-specific 3D-printed surgical guide improved the accuracy of the osteotomy and the alignment of the lower limb.