Abstract:[Objective] To compare the clinical outcome of core decompression with or without fibula allograft in the treatment of osteo-necrosis of the femoral head (ONFH). [Methods] A retrospective study was done on the patients who received hip preservation treatment forONFH in our hospital from June 2018 to June 2020. According to the results of doctor-patient communication, 43 cases were treated withcore decompression with fibular allograft support (supported group), while other 27 cases were treated with core decompression only (unsup-ported group). The data of perioperative period, follow-up and imaging were compared between the two groups. [Results] Although the sup-ported group was significantly inferior to the unsupported group in terms of operating time [(55.1±9.2) min vs (40.3±10.3) min, P＜0.001), to-tal length of incision [(5.5±0.6) cm vs (3.1±0.7) cm, P＜0.001], intraoperative blood loss [(33.7±5.0) ml vs (30.9±4.6) ml, P=0.022], and intra-operative fluoroscopy times [(4.2±1.0) vs (3.6±1.0), P=0.017], the former was significantly superior to the latter in terms of incision healinggrade [case, A/B/C, (30/10/3) vs (10/9/8), P=0.010], ambulation time postoperatively [(3.4±0.4) days vs (4.6±0.7) days, P＜0.001] and hospital-ization [(4.8±0.9) days vs (7.1±1.3) days, P＜0.001]. As time went in the follow-up period lasted for 24 months, the ARCO grade, bone edemaand joint effusion signs significantly improved (P＜0.05), while the Tonnis stage remained unchanged (P＞0.05) in the supported group. How-ever, there were no significant changes in the abovesaid items in the unsupported group (P＞0.05). There was no significant difference in theabove indexes before and 6 months after surgery between the two groups (P＞0.05). At 24 months after surgery, the supported group provedsignificantly superior to the unsupported group in terms of ARCO classification [case, I/II/III/IV, (29/12/2/0) vs (11/10/6/0), P= 0.030], boneedema [case, ＜15%/15%~30%/≥30%, (34/8/1) vs (14/10/3), P=0.044] and joint effusion [case, 0/1/2/3, (30/11/2/0) vs (10/14/3/0), P=0.026].[Conclusion] For hip preservation treatment of ONFH, core decompression combined with allogenic fibula support has obvious advantagesand achieves satisfactory clinical results.

Abstract:[Objective] To compare the short-term clinical outcomes of unicompartmental knee arthroplasty (UKA) versus total knee ar-throplasty (TKA) for medial compartment osteoarthritis of the knee. [Methods] A retrospective analysis was performed on 457 patients whoreceived arthroplasty for medial compartment osteoarthritis of the knee in our hospital from January 2021 to August 2023. By propensityscorematching (PSM) method, 88 patients underwent UKA and 88 received TKA were finally included in this study. The document regard-ing perioperative period, follow-up and auxiliary examinations were compared between the two groups. [Results] The UKA group proved sig-nificantly superior to the TKA group in terms of operation time [(74.6±8.1) min vs (85.4±8.7) min, P＜0.001], incision length [(7.1±0.9) cm vs(14.4 + 2.6) cm, P＜0.001], intraoperative blood loss [(174.6 ±33.5) ml vs (305.7± 68.9) ml, P＜0.001], postoperative drainage [(22.7±3.6) mlvs (43.5±6.7) ml, P＜0.001], ambulation time [(2.7±0.5) hours vs (4.7±1.1) hours, P＜0.001], as well as incision healing grade, hospital stayand treatment cost. In addition, the patients in UKA group resumed full weight-bearing activities significantly earlier than those in TKAgroup (P＜0.05). The VAS, HSS, WOMAC scores and ROM significantly improved in both groups over time (P＜0.05). The UKA was signifi-cantly better than the TKA group regarding to VAS, HSS, WOMAC score and ROM 1 month postoperatively and at the last follow-up (P＜0.05). However, there was no significant difference in the incidence of later complications between the two groups (P＞0.05). As for auxiliaryexamination, the UKA group was also significantly better than the TKA group in terms of the levels of TNF-α and TGF-β1 in synovial fluid1 month after surgery (P＜0.05). At the last follow-up, the UKA group got significantly better femorotibial angle (FTA), medial proximal tibialangle (MPTA), posterior tibial slope (PTS) and mechanical axis deviation (MAD) on images than the TKA group (P＜0.05). [Conclusion] Formedial compartment osteoarthritis of the knee, UKA is less invasive and has better short-term clinical outcomes than TKA.

Abstract:[Objective] To compare clinical outcomes of unicompartmental knee arthroplasty (UKA) versus total knee arthroplasty(TKA) for medial compartment knee osteoarthritis (MC-KOA) in the elderly. [Methods] A retrospective analysis was conducted on 109 el-derly patients who received knee arthroplasty for MC-KOA from September 2021 to September 2022. According to the preoperative doctorpatientcommunication, 59 patients underwent UKA, while other 50 patients underwent TKA. The perioperative, follow-up and imaging dataof the two groups were compared. [Results] The UKA group proved significantly superior to the TKA group in terms of operation time [(61.8±4.7) min vs (80.4±6.5) min, P＜0.001], length of incision, [(5.7±0.3) cm vs (6.9±0.4) cm, P＜0.001], intraoperative blood loss [(94.3±13.1) mlvs (147.5±19.8) ml, P＜0.001], postoperative drainage volume [(169.8±10.0) ml vs (366.7±41.1) ml, P＜0.001], time to regain active knee flex-ion of 90° [(13.8±2.2) days vs (17.1±2.4) days, P＜0.001], and hospital stay [(9.8±1.8) days vs (14.4±2.4) days, P＜0.001]. As time went on,the VAS and KSS scores, knee extension-flexion ROM, stride speed, stride frequency and stride length were significantly improved in bothgroups (P＜0.05). At the last follow-up, the UKA group was also significantly better than the TKA in terms of KSS score [(88.2±3.6) vs (82.7±3.1), P＜0.001], knee extension-flexion ROM [(123.9±5.7)° vs (116.4±5.1)°, P＜0.001], stride speed [(98.4±5.3) cm/s vs (85.1±5.9) cm/s, P＜0.001], stride length [(89.3±10.1)cm vs (80.1±11.2) cm, P＜0.001]. As for imaging, femorotibial angle (FTA), hip-knee-ankle angle (HKA),medial proximal tibial angle (MPTA) and posterior tibial slope (PTS) were significantly improved in both groups at the last follow-up com-pared with those preoperatively (P＜0.05). However, there were no significant differences in the above image indexes between the two groupsat any corresponding time points (P＞0.05). [Conclusion] Both UKA and TKA do achieve satisfactory clinical consequences for MC-KOA inelderly. In comparison, the UKA has more advantages in reducing surgical trauma, promoting functional recovery of knee joint and improvinggait over the TKA.

Abstract:[Objective] To compare clinical consequences of unilateral biportal endoscopic transforaminal lumbar interbody fusion(UBE-TLIF) versus minimal invasive transforaminal lumbar interbody fusion (MIS-TLIF) for multi-segment lumbar spinal stenosis (LSS).[Methods] A retrospective analysis was performed on 52 patients who received accurate minimal invasive surgery based on nerve block loca-tion for multi-level LSS in our hospitals from January 2022 to August 2023. According to preoperative doctor-patient communication, 28 pa-tients were treated with UBE-TLIF, while other 24 patients underwent MIS-TLIF. The perioperative, follow-up and imaging data of the twogroups were compared. [Results] All patients in both groups had operation performed successfully without serious complications, such asdeath and nerve injury. The UBE-TLIF group proved significantly superior to the MIS-TLIF group in terms of operative time [(137.7±24.6)min vs (154.8±34.5) min, P=0.042], intraoperative blood loss [(182.5±33.2) ml vs (211.7±57.4) ml, P=0.027], bed rest time [(2.4±0.5) days vs(3.3±0.4) days, P＜0.001], hospital stay [(7.3±1.4) days vs (8.4±2.1) days, P=0.042]. As time went on during follow-up period lasted for (10.6±1.9) months in a mean, the VAS, ODI and JOA scores in both groups were significantly improved (P＜0.05), whereas which were not statisti-cally significant between the two groups at any corresponding time points (P＞0.05). As for imaging, the area of internal dural sac and height of intervertebral space at the responsible level were significantly improved in both groups after surgery (P＜0.05), while which were not signifi-cantly different between the two groups at any time points accordingly (P＞0.05). At the last follow-up, the intervertebral fusion rate was of89.3% in the UBE-TLIF group, while 91.7% in the MIS-TLIF group, and the difference was not statistically significant (P＞0.05). [Conclu-sion] The accurate minimally invasive decompression and instrumented fusion in the treatment of multi-level lumbar spinal stenosis do sig-nificantly reduce surgical trauma and patients’ economic burden. In contrast, UBE-TLIF group was superior to MIS-TLIF group in terms ofoperation time, intraoperative blood loss, bed rest and hospital stay.

Abstract:[Objective] To compare the clinical outcomes of unilateral biportal endoscopy lumbar interbody fusion (UBE-LIF), versusminimally invasive surgery transforaminal lumbar interbody fusion (MIS-TLIF) for degree II~III lumbar spondylolisthesis. [Methods] FromJanuary 2019 to June 2022, a total of 249 patients who received surgical treatment for degree II~III spondylolisthesis were included in thisstudy, and were divided into two groups according to random number table method. Of them, 132 patients received UBE-LIF (the UBEgroup), while other 117 received MIS-TLIF (the MIS group). The perioperative, follow-up and imaging data of the two groups were com-pared. [Results] The operation was successfully completed in both groups without serious complications. The UBE group proved significant-ly superior to the MIS group in terms of intraoperative blood loss [(112.2±20.5) ml vs (132.9±25.8) ml, P＜0.001], intraoperative fluoroscopytimes [(3.9±1.3) time vs (4.6±1.5) times, P＜0.001] and walking time after operation [(1.6±0.5) days vs (1.9±0.3) days, P＜0.001]. The averagefollow-up time was of (15.0±3.0) months, and the UBE cohort resumed full weight-bearing activity significantly earlier than the MIS [(65.5±10.2) days vs (68.9±11.6) days, P=0.015]. The VAS, ODI and JOA scores in both groups were significantly improved with the time after sur-gery (P＜0.05). The UBE group was significantly better than the MIS group in terms of VAS [(2.4±0.4) vs (2.7±0.6), P＜0.001], ODI [(29.2±6.7) vs (33.8±5.8), P＜0.001], JOA score [(20.3±3.7) vs (18.6±4.2), P＜0.001] 3 months after surgery. Radiographically, the extent of slippage,intervertebral height, lumbar lordosis, and local Cobb angle significantly improved in both groups at the last follow-up compared with thosepreoperatively (P＜0.05), whereas which was not statistically significant between the two groups at any time points accordingly (P＞0.05).[Conclusion] UBE-LIF achieves clinical consequence similar to MIS-TLIF for degree II~III lumbar spondylolisthesis. However, the UBELIFhas obvious advantages in reducing surgical trauma and improving short-term lumbar function over the MIS-TLIF.

Abstract:[Objective] To evaluate the efficacy and safety of platelet -rich plasma (PRP) versus corticosteroid (CS) therapy for tendinop-athy by using meta-analysis. [Methods] Randomized controlled trials (RCT) on PRP versus CS in Pubmed, Cochrane Library, Embase andWeb of Science were searched. Use Jadad to evaluate the quality of the literature, the data extracted from the literature was subjected to me-ta-analysis by using Revman 5.3 software. [Results] A total of 15 studies were included into this analysis, involving 957 patients. As resultsof meta-analysis, the CS group proved significantly superior to the PRP group in term of VAS score one month after treatment [MD=0.85,95%CI 0.12~1.58, P=0.02], while which became not significantly different between the two groups 3 months after treatment (P＞0.05). How-ever, the PRP group was significantly better than CS group 6 months after treatment in term of VAS score [MD=-1.95, 95%CI 3.14~0.77, P＜0.001]. At 1 and 3 months after treatment, there was no statistical significance in AOFAS score between the two groups (P＞0.05). At 6months after treatment, AOFAS score in PRP group was significantly better than that in CS group [MD=5.25, 95%CI 2.45~8.06, P=0.0002].At 1 and 3 months after treatment, there was no significant difference in DASH scores between the two groups (P＞0.05). [Conclusion] Forpatients with tendinopathy, CS is better than PRP in short-term therapeutic effect, which become not significantly different in the mediumtermtherapeutic effect, and while the PRP is better than CS in term of long-term therapeutic effect.

Abstract:Periprosthetic joint infection (PJI) is a serious complication after joint replacement, which requires a lot of medical resourcesand brings a huge economic burden to patients and society. In recent years, with the continuous development of novel molecular diagnostictechniques, the diagnosis and treatment of PJI have made great progress. Compared with traditional culture, the next-generation sequencingcan diagnose pathogenic microorganisms quickly, accurately and comprehensively, and improve the detection rate of pathogenic microorgan-isms in PJI, so as to achieve early diagnosis and treatment of PJI. This paper reviews the principle and method of next-generation sequencingand its characteristics, advantages and limitations in identifying pathogenic microorganisms in PJI.

Abstract:Unicompartmental knee arthroplasty (UKA) is a commonly used and effective treatment for knee osteoarthritis (KOA) limitedto a single compartment. With the continuous development of traditional cemented prostheses, and emerging cementless UKA prosthetic ma-terials, both kinds of prostheses have demonstrated significant clinical efficacy. In this article, we review and compare the design differences,clinical efficacy, associated complications, and use of new technologies in UKA between cemented and cementless UKA to comprehensivelyassess their clinical efficacy.

Abstract:Intervertebral disc degeneration (IDD), a common clinical disease, brings serious economic burden to the society with the ag-gravation of population ageing. The pathogenesis of IDD is complex, involving many aspects, such as mechanical loading, inflammatory reac-tion, autoimmunity and so on. The IL-17 is a major effector of T helper cell 17(Th17), and is involved in a variety of biological processes, in-cluding inflammation and autoimmunity. At present, more and more studies have found that the IL-17 is highly correlated with IDD, whichmay accelerate the process of IDD by promoting the degradation of extracellular matrix (ECM), exacerbating the inflammatory response, regu-lating the metabolism of nucleus pulposus cells, and promoting extracellular matrix angiogenesis. In this article, we will discuss the mecha-nism of IL-17-mediated IDD, and review the current research status of IL-17-based treatment of IDD.

Abstract:Ossification of the posterior longitudinal ligament (OPLL) is an ectopic ossification of the posterior longitudinal ligament(OPLL), which is prone to occur in cervical spine. At present, the physiological and pathological understanding of OPLL remains not clear,and its occurrence and development may be related to genetic and environmental factors. The main clinical manifestations are a group ofneurological dysfunction syndromes due to compression of spinal cord and nerve roots. Imaging data combined with clinical signs and symp-toms can be used to make diagnosis. The ossified matter formed behind the vertebral body can be seen by X-ray, the compression degree ofspinal cord and nerve roots can be assessed by magnetic resonance imaging, and the ossified matter can be better evaluated and classifiedby CT. Clinically asymptomatic patients can be treated conservatively, but need to pay close attention to the progress of the disease and ac-cept reasonable clinical guidance. Patients with spinal cord compression and nerve root symptoms tend to be treated with surgery, but thechoice of surgical approach varies according to the symptoms, signs and types of patients.

Abstract:[Objective] Transcriptome sequencing and bioinformatics analysis were used to identify key genes and related pathways inosteosarcoma. [Methods] The osteosarcoma tissues and adjacent control tissues were collected to analyze the expression profiles by tran-scriptome microarray and differential expression genes (DEGs). The Gene Ontology(GO) and Kyoto Encyclopedia of Genes and Genomes(KEGG) enrichment analysis of DEGs was performed through online database. [Results] A total of 5 pairs of osteosarcoma and para-tumorcontrol tissues were included in this study. A total of 1 211 genes with significantly up-regulated expression and 810 significantly down-reg-ulated expression were screened in tumor tissues. GO analysis suggested that DEGs was mainly concentrated in biological processes such astissue development, small molecule metabolism and cell cycle, while KEGG analysis suggested that DEGs was mainly involved in adhesionplaques, extracellular matrix receptor interactions, cancer signaling pathways and cell cycle related pathways. [Conclusion] COL1A1, SPP1,POSTN, TYMS, TNC, ATP1A2, PDK4, CLIC5, ACTA1 and FABP4 may play an important role in the development of osteosarcoma.

Abstract:[Objective] To introduce the surgical technique and preliminary clinical results of combined minimally invasive surgery forthe treatment of invasive vertebral hemangioma in the thoracic spine. [Methods] The patients received spinal artery angiography before sur-gery to understand the blood supply of the lesions in the spinal canal, and the blood supply artery was embolized by spring coil. The patientwas placed in prone position with fluoroscopic positioning performed. After local anesthesia, percutaneous puncture needles were insertedalong the pedicle to reach the target location of the vertebral body, and then a working channel was established. Disposable flexible bone ce-ment filling kit was inserted, and the bone cement was slowly pushed into the entire lesion aera under repeated fluoroscopy. In addition, thetransforaminal endoscope working channel was established under local anesthesia, and a trephine was inserted to enlarge and shape the foramina. The operating cannula was pushed into the posterior margin of the involved vertebra, the occupying tissue in the spinal canal was re-moved under the endoscope until the dural pulsation was observed. Finally, a drainage tube was placed and the wound was sutured. [Results]The patients got significant pain relief with VAS score of 0 postoperatively, while had muscle strength of the right lower limb recovered tograde 4 +. Images 1 week after surgery showed about 60% of intraspinal hemangioma removed, with obvious operative area exudation. Theremnant of hemangioma shrinked gradually 4 months after surgery compared with that preoperatively, no significant recurrence or increasewas observed, the spinal cord recovered significantly under compression, and the operative area exudation was completely absorbed. [Conclusion] This combined minimally invasive surgery provides a new idea and technique of the minimally invasive treatment for invasive verte-bral hemangioma in thoracic spine, and achieves satisfactory primary clinical outcome.

Abstract:[Objective] To investigate the clinical outcomes of manual reduction under general anesthesia and percutaneous cementaugmentedpedicle screw fixation in the treatment of stage IIIa Kümmell’s disease. [Methods] A retrospective study was done on 16 patientswho received manual reduction and percutaneous cement-augmented pedicle screw fixation for stage IIIa Kümmell’s disease in our hospitalfrom January 2019 to February 2023. Clinical and imaging data were evaluated. [Results] All the 16 patients were successfully operated onwithout any serious complications such as bone cement leakage, nerve and vascular injury, with the mean operation time of (96.6±11.1) minand the mean intraoperative bleeding of (93.4±13.6) ml. During the follow-up period lasted for more than 12 months, none of the 16 patientshad any recurrence of severe low back pain or revision surgery. Compared with those preoperatively, the VAS score [(7.4±0.7), (2.7±0.6),(2.3±0.7), P＜0.001] and ODI scores [(74.5±3.1), (33.4±3.9), (29.9±2.8), P＜0.001] were significantly improved before discharge and at thelatest follow-up. As for imaging, compared with those preoperatively, the vertebral anterior height (AH) was significantly increased [(12.2±1.1) mm, (20.4±0.9) mm, (20.2±0.9) mm, P＜0.001], while the local kyphotic angle (LKA) was significantly decreased before discharge and atthe latest follow-up in the 16 patients. [Conclusion] Manual reduction and percutaneous bone cement augmented pedicle screw fixation inthe treatment of stage IIIa Kümmell’s disease trauma has the advantages of less trauma, rapid recovery, and does achieve satisfactory clinicalconsequence.

Abstract:[Objective] To investigate the short-term outcomes of core muscle training for mild adolescent idiopathic scoliosis. [Meth-ods] A retrospective study was conducted on 33 patients who were hospitalized for adolescent idiopathic scoliosis in our hospital from Decem-ber 2021 to June 2023. According to the results of doctor-patient communication, 18 patients received systematic core muscle training (CMgroup), while other 15 patients received traditional physical training (TP group). The clinical and imaging data of the two groups were com-pared. [Results] All patients in both groups successfully completed the training without serious adverse reactions. There was no significantdifference in treatment compliance VAS scores between the two groups (P＞0.05). After 10 weeks of treatment, the standing height and sittingheight were increased (P＜0.05), the main curve Cobb angle, C7-CSVL and SVA, the temperature difference between the paravertebral mus-cle and rectus abtris in infrared thermal imaging, and the plantar pressure transfer in the 2~5 metatarsal bone and the medial heel regionwere significantly improved in both groups (P＜0.05). At 10 weeks after of treatment, CM group proved significantly superior to the TP groupin terms of standing height [(156.5±4.6) cm vs (155.8±4.3) cm, P＜0.001], sitting height [(84.4±4.6) cm vs (82.6±4.4) cm, P＜0.001], Maincurve Cobb angle [(15.3±3.1)° vs (17.1±3.9)°, P＜0.001], C7PL-CSVL [(23.3±3.1) mm vs (25.3±3.2) mm, P＜0.001], and SVA [(31.5±3.9) mmvs (33.8±3.9) mm, P＜0.001]. [Conclusion] The core muscle training does strengthen the core muscles on both sides of the spine and im-prove the spinal spatial balance, which is of great significance for the prevention of spinal deformity.

Abstract:[Objective] To compare the efficiency of trephines with or without inner thread for spinal bony tissue biopsy. [Methods] Aretrospective study was conducted on 96 patients who underwent spinal bony tissue biopsy from January 2020 to August 2023. Based on pre-operative surgeon-patient discussion, 50 patients had biopsy performed by trephine with inner thread (the IT group), while the remaining 46patients were by trephine of non-IT ( the non-IT group). The perioperative items, test results and postoperative adverse reactions were com-pared between the two groups. [Results] Although there were no significant differences in biopsy segment, incision length, intraoperativeblood loss and biopsy success rate between the two groups (P＞0.05), the IT group proved significantly superior to the non-IT group in termsof operative time [(17.0±2.8) min vs (19.5±3.0) min, P＜0.001], and the positive rate of tissue harvesting (87.8% vs 64.5%, P＜0.001), in addi-tion, the former was significantly better than the latter regarding to the overall incidence of postoperative complications (20.0% vs 54.4%, P＜0.001). [Conclusion] Using the trephine with inner thread does significantly shorten the spine biopsy time, increase the positive rate of punc-ture biopsy, and reduce the incidence of postoperative complications.

Abstract:[Objective] To evaluate the clinical efficacy of discectomy under delta large channel endoscope in the treatment of lumbardisc herniation. [Methods] A retrospective study was conducted on 73 patients who received the large-channel endoscopic discectomy forlumbar disc herniation from January 2020 to October 2021. The clinical and imaging data were evaluated. [Results] All the patients weresuccessfully operated with the average operative time of (78.1±24.0) min, intraoperative fluoroscopy of (3.3±1.0) times, and followed up for(18.2±5.3) months. Compared with those preoperatively, back pain VAS [(5.6±1.8), (1.8±1.0), (1.1±0.9), P＜0.001], leg pain VAS score [(7.5±1.5), (1.3±1.0), (1.1±0.8), P＜0.001], ODI [(70.3±15.7), (15.2±10.3), (7.6±6.0), P＜0.001], JOA score [(10.3±3.3), (20.9±2.0), (23.8±3.3), P＜0.001] significantly improved 3 months postoperatively and at the last follow-up. Radiographically, the lumbar lordosis remained unchangedat the last follow-up compared with that before surgery (P＞0.05), but the intervertebral disc height index increased significantly [(26.6±4.9)%, (28.2±5.2)%, P＜0.001]. [Conclusion] The delta endoscopy achieves generally satisfactory consequences in the treatment of lumbardisc herniation, and is a minimally invasive surgical method.

Abstract:[Objective] To investigate the clinical efficacy of 3D printed guide assisted calcaneal osteotomy in the treatment of Haglundsyndrome. [Methods] A retrospective study was done on 37 patients who received surgical treatment for Haglund syndrome in our hospitalfrom January 2021 to June 2022. According to of doctor-patient communication preoperatively, 17 patients had osteotomy performed withthe 3D printed guide (the guide group), while other 20 patients was with conventional free hand technique (the free-hand group). Clinicaland imaging documents were compared between the two groups. [Results] The guide group proved significantly less than the free-handgroup in terms of operation time [(42.8±4.1) min vs (50.2±4.2) min, P＜0.001] and intraoperative fluoroscopy times [(0.6±0.6) times vs (2.2±0.9) times, P＜0.001], but there was no significant difference in incision length and intraoperative blood loss between the two groups (P＞0.05). All patients were followed up for a mean of (18.3±7.5) months. Compared with those preoperatively, the VAS score and AOFAS scorein both groups were significantly improved at the last follow-up (P＜0.05). At the last follow-up, the guide group was significantly better thanthe free-hand group regarding AOFAS score [(96.5±2.9) vs (94.4±3.3), P=0.047]. As for imaging, the posterior calcaneal angle (Fowler-Philipp angle, FPA) and X/Y ratio in both groups significantly improved at the last follow-up compared with those preoperatively (P＜0.05).Although the FPA and X/Y ratio were not significantly different between the two groups before surgery (P＞0.05), the guide group got signifi-cantly greater FPA than the free-hand group at the latest follow up [(65.6±1.9)° vs (61.8±4.9)°, P＜0.005]. [Conclusion] Compared with tra-ditional free-hands calcaneal osteotomy, 3D printied guide assisted calcaneal osteotomy has better therapeutic effect in the treatment of Ha-glund syndrome, improving surgical accuracy and reducing surgical injury.

Abstract: