scholarly journals Schatzker II tibial plateau fractures: Anatomically precontoured 3.5 mm locking compression plates allow for improved patient outcome

2018 ◽  
Vol 6 (4_suppl2) ◽  
pp. 2325967118S0002
Author(s):  
Wolf Christian Prall ◽  
Thomas Kusmenkov ◽  
Julian Fürmetz ◽  
Hermann O. Mayr ◽  
Wolfgang Böcker
Keyword(s):  
Patient Outcome ◽  
Internal Fixation ◽  
Tibial Plateau ◽  
Joint Surface ◽  
Lateral Tibial Plateau ◽  
Locking Compression Plates ◽  
Bone Graft Substitutes ◽  
The Mean ◽  
Group B

In the operative treatment of split depression factures to the lateral tibial plateau, the reconstruction of the depressed joint surface is eagerly sought after. The subchondral bony defect often requires bone grafting or bone graft substitutes. At least equally important is the achievement of an internal fixation that provides the greatest possible support for the fragile joint surface fragments. The design of the anatomically precontoured locking compression plates features a higher number of locking screws underneath the joint surface and permits the screw placement closer to the subchondral zone compared to conventional plates. Whether the altered design results in better patient outcome is analysed in this study. Our databank was searched for Schatzker II fractures from 2012 until 2015. Patients that underwent open reduction and internal fixation with anatomically precontoured 3.5 mm locking compression plates (A) or conventional 4,5 mm L-shaped locking compression plates and screws (B) were included and retrospectively evaluated. CT-scans, radiographs in two planes and in full length standing mode, if available, were analysed. Details of the operative procedures and secondary events were determined. Objective outcome parameters were collected from the patient records, subjective outcome parameters were assessed in a survey and WOMAC as well as Rasmussen functional knee scores were calculated. A total of 36 patients were included (A=20, B=16). The mean patient age, the ratio male to female and the mean follow up were comparable. CT-scans revealed an equal mean size of the depressed joint surface (A: 23.7 x 25.3 mm; B: 23.9 x 24.0 mm) and maximal depression depth (11.2 and 11.8 mm). The duration of the operation, the frequency of utilizing bone grafts or bone graft substitutes and of lateral meniscus repair as well as the rate of subsequent implant removal were also comparable. In the early postoperative controls, the radiological assessment according to Rasmussen revealed a mean score of 9.1 (A) and of 8.5 (B). During follow up, the mean score decreased to 8.1 and 6.7 for A and B, respectively. This difference was statistically significant (p<0.05). A valgus deviation was more often observed in group B. Both, the WOMAC and the Rasmussen functional knee score revealed lower mean values for group B in the final evaluation. The progressive decrease of the Rasmussen radiological score for the conventional 4,5 mm L-shaped locking compression plates and screws was predominantly due to a secondary loss of reduction and an increasing valgus deviation. The altered design of the anatomically precontoured 3.5 mm locking compression plate seems to prevent more sufficiently the reduced joint surface fragments from sintering over time. The anatomically precontoured 3.5 mm locking compression plate allows for improved patient outcome and should closely be considered for internal fixation of split depression fractures to the lateral tibial plateau.

scholarly journals Comparison of outcomes of ORIF versus bidirectional tractor and arthroscopically assisted CRIF in the treatment of lateral tibial plateau fractures: a retrospective cohort study

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Xiangtian Deng ◽  
Hongzhi Hu ◽  
Yiran Zhang ◽  
Weijian Liu ◽  
Qingcheng Song ◽  
...  
Keyword(s):  
Cohort Study ◽  
Internal Fixation ◽  
Clinical Outcomes ◽  
Retrospective Cohort Study ◽  
Retrospective Cohort ◽  
Tibial Plateau ◽  
Clinical Score ◽  
Lateral Tibial Plateau ◽  
Significant Difference

Abstract Background Lateral tibial plateau fractures (TPFs) are often treated with conventional open reduction and internal fixation (ORIF) through standard anterolateral sub-meniscal arthrotomy. There has been increasing support for “bidirectional rapid redactor” device-assisted closed reduction and internal fixation (CRIF) for treating TPFs. The aim of the present study is to compare the clinical and radiological outcomes between CRIF and ORIF procedures. Methods We performed a retrospective cohort study of 55 lateral TPF patients (Schatzker types I–III) who accepted surgical treatment at our trauma level 1 center between January 2016 and January 2018. They were divided into the CRIF group (32 patients) and the ORIF group (23 patients) based upon the different surgical protocols. The patients’ clinical outcome analysis was evaluated by using the Knee Society Score (KSS) and Rasmussen’s clinical score. For radiological assessment, changes in tibial plateau width (TPW), articular depression depth (ADD), medial proximal tibial angle (MPTA), and posterior tibial slope angle (PTSA) were evaluated using radiographs and computed tomography (CT) scan. Results The CRIF group had a mean follow-up of 28.9 months, and the ORIF group had a mean follow-up of 30.7 months (p>0.05). Furthermore, there was no statistically significant difference in terms of age, gender, injury mechanism, follow-up time, time interval from injury to surgery, and Schatzker classification in the two groups. With respect to the clinical outcomes including the KSS score and Rasmussen’s clinical score, there was also no significant difference (p>0.05). Nevertheless, the CRIF group had lower intra-operative blood loss, shorter hospitalization days, and better range of movement of the knee joint than the ORIF group (p<0.05). Furthermore, CRIF had better radiological results when compared to the ORIF group using Rasmussen’s radiological score (p<0.05), although no significant difference was observed in TPW, ADD, MPTA, and PTSA between the two groups (p>0.05). Conclusion The present study showed that CRIF could achieve comparable clinical outcomes and better radiological results for treating lateral TPFs as compared with conventional ORIF.

scholarly journals Radiological Outcome Measures Indicate Advantages of Precontoured Locking Compression Plates in Elderly Patients With Split-Depression Fractures to the Lateral Tibial Plateau (AO41B3)

2021 ◽  
Vol 12 ◽  
pp. 215145932110439
Author(s):  
Wolf C. Prall ◽  
Thomas Kusmenkov ◽  
Maximilian Rieger ◽  
Florian Haasters ◽  
Hermann O. Mayr ◽  
...  
Keyword(s):  
Elderly Patients ◽  
Outcome Measures ◽  
Tibial Plateau ◽  
Young Patients ◽  
Joint Surface ◽  
Secondary Outcome ◽  
Radiological Outcome ◽  
Lateral Tibial Plateau ◽  
Significant Deterioration ◽  
Locking Compression Plates

Background Split-depression fractures to the lateral tibial plateau (AO41B3) often feature severe joint surface destructions. Precontoured locking compression plates (LCPs) are designed for optimum support of the reduced joint surface and have especially been emphasized in reduced bone quality. A lack of evidence still inhibits their broad utilization in elderly patients. Thus, aim of the present study was to investigate the implant-specific radiological outcomes of AO41B3-fractures in young versus elderly patients. Methods The hospital’s database was screened for isolated AO41B3-factures, open reduction and internal fixation (ORIF), and radiological follow-up ≥12 months. CT-scans, radiographs, and patients’ records were analyzed. Patients were attributed as young (18–49) or elderly (≥50 years). Additional subgrouping was carried out into precontoured LCP and conventional implants. The Rasmussen Radiological Score (RRS) after 12 months was set as primary outcome parameter. The RRS postoperatively and the medial proximal tibial angle (MPTA) postoperatively and after 12 months were secondary outcome parameters. Results Fifty nine consecutive patients were included (26 young, 38.2 ± 7.8 years; 33 elderly, 61.3 ± 9.4 years). There were no significant differences regarding mean size and depression depth of the lateral joint surface fragments. Prior to implant-specific subgrouping, the radiological outcome measures revealed no significant differences between young (RRS = 7.7 ± 1.7; MPTA = 90.3 ± 2.3°) and elderly (RRS = 7.2 ± 1.7; MPTA = 90.5 ± 3.3°). After implant-specific subgrouping, the radiological outcome revealed significantly impaired results in young patients with conventional implants (RRS(C) = 6.9 ± 1.6, RRS(LCP) = 8.5 ± 1.5, P = .015; MPTA(C) = 91.5 ± 1.9°, MPTA(LCP) = 89.1 ± 2.1°, P = .01). The effect was even more pronounced in elderly patients, with highly significant deterioration of the radiological outcome measures for conventional implants compared to precontoured LCP (RRS(C) = 5.7 ± 1.6, RRS(LCP) = 8.2 ± .8, P < .001; MPTA(C) = 92.6 ± 4.2°, MPTA(LCP) = 89.2 ± 1.4°, P = .002). Conclusion Utilizing precontoured LCP in the treatment of AO41B3-fractures is associated with improved radiological outcomes. This effect is significant in young but even more pronounced in elderly patients. Consequently, precontoured LCP should closely be considered in any AO41B3-fracture, but especially in elderly patients.

scholarly journals Arthroscopic-Guided Balloon Tibioplasty in Schatzker III Tibial Plateau Fracture

Joints ◽  
2018 ◽  
Vol 06 (04) ◽  
pp. 220-227 ◽  
Author(s):  
Fabrizio Cuzzocrea ◽  
Eugenio Jannelli ◽  
Alessandro Ivone ◽  
Simone Perelli ◽  
Alberto Fioruzzi ◽  
...  
Keyword(s):  
Ct Scan ◽  
Tibial Plateau ◽  
Case Series ◽  
Clinical Score ◽  
Joint Surface ◽  
X Rays ◽  
Level Of Evidence ◽  
Significant Difference ◽  
The Mean

Abstract Purpose The study aims to present the results at a mean 28-months follow-up of arthroscopic-guided balloon tibioplasty and to spot some technical tricks and some practice using tools and materials. Methods The study relates to six patients with tibial plateau fractures type Schatzker III with tibial plateau depression more than 4 mm at preoperative computed tomography scan (CT-scan). The follow-up period ranged from 22 to 33 months, with a mean of 28 months. No patients were lost to follow-up. The patients were evaluated clinically using the Rasmussen score system and Lysholm score systems at 6 to 12 and 24 months, postoperatively. Radiographic evaluations (standard X-rays) were done preoperatively at 1, 3, and 12 months postoperatively while a CT-scan with 3D reconstruction was performed preoperatively, at the first day and 6 months, postoperatively. Results The mean Rasmussen clinical score at 6 months postoperatively was 26.3 while at 1-year postoperatively the mean Rasmussen clinical score was 28.33. At 2-year postoperatively the mean Rasmussen clinical score was 28.83. Statistically significant difference was found in 6-months and 2-years results (p < 0.05). CT-scan achieved the first postoperative day showed the recovery of approximately 70% of the area of the interested tibial plateau, restoring of the joint surface without articular bone free fragments. Conclusion The described surgical procedure, if correctly performed with proper indications (Schatzker III), respect the principles mentioned above and the clinical and radiological results confirm our purpose. Level of Evidence This is a therapeutic case series, level IV study.

scholarly journals Functional outcome of Schatzker type V and VI tibial plateau fractures managed with open reduction internal fixation using dual plates

2017 ◽  
Vol 3 (5) ◽  
pp. 961
Author(s):  
Saranjeet Singh Jagdev ◽  
Subodh Kumar Pathak ◽  
Abhijeet Salunke ◽  
Pritam Maheshwari ◽  
Prahlad Ughareja ◽  
...  
Keyword(s):  
Internal Fixation ◽  
Functional Outcome ◽  
Open Reduction ◽  
Tibial Plateau ◽  
Oxford Knee Score ◽  
Tibial Plateau Fractures ◽  
Schatzker Type ◽  
The Mean ◽  
Type V

<p class="abstract"><strong>Background:</strong> <span lang="EN-IN">Complex tibial plateau fractures remain a challenge to even the most experienced surgeons. These injuries usually affect the young population in their productive years thereby causing socioeconomic impact. We performed a retrospective study to evaluate the functional outcome of of Schatzker type V and VI managed through open reduction and internal fixation.</span></p><p class="abstract"><strong>Methods:</strong> <span lang="EN-IN">26 patients with Schatzker type V and type VI tibial plateau fractures treated with open reduction and internal fixation using plates were included in the study. Three patients were lost to follow up, 23 patients were evaluated in the final analysis. The preoperative, intraoperative data was noted from the indoor files.The final evaluation was done using Oxford knee score and VAS score</span>.<strong></strong></p><p class="abstract"><strong>Results:</strong> <span lang="EN-IN">There were nine Schatzker type V fractures and 14 patients with Schatzker type VI fractures. The mean duration of follow-up was 68.32 months ranging from 41 months to 126 months. The mean Oxford knee score was 39.78. Patients with Schatzker type VI had mean OKS of 37.7.The mean MPTA and mean PPTA were 88.75 degrees and 7.35 degrees respectively. Average VAS Score was 2.8 ranging from 1 to 3.9. All patients returned to their pre-injury level of activity and employment. There were no patients of deep infection. </span></p><p class="abstract"><strong>Conclusions:</strong> <span lang="EN-IN">We conclude that open reduction and internal fixation of high-energy tibial plateau fractures gives excellent to good functional outcome with minimal soft tissue complications. The complications can be minimized with proper patient selection and soft tissue dissection.</span></p>

Staged Management of Severely Displaced Calcaneal Fractures With Transarticular Pinning: A Damage Control Strategy

2021 ◽  
pp. 107110072110130
Author(s):  
Kyeong-Hyeon Park ◽  
Chang-Wug Oh ◽  
Joon-Woo Kim ◽  
Hee-June Kim ◽  
Dong-Hyun Kim ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Internal Fixation ◽  
Kirschner Wire ◽  
Wound Complications ◽  
Calcaneal Fractures ◽  
Simple Method ◽  
Wire Fixation ◽  
The Mean ◽  
Radiographic Union

Background: Severely displaced calcaneal fractures can result in considerable morphology derangement and may be accompanied by soft tissue compromise. Delayed operative restoration of the calcaneal morphology may result in acute retensioning of the damaged soft tissue with associated wound-related complications. In this study, we describe a staged treatment of displaced intra-articular calcaneal fractures that uses temporary transarticular Kirschner wire (K-wire) fixation and staged conversion to definite fixation. Methods: We identified all of the patients who were treated at our institution for calcaneal fractures between 2015 and 2019. A total of 17 patients with 20 calcaneal fractures were selectively treated with 2-stage management. Temporary transarticular K-wire fixation was performed 24 hours after the injury to restore calcaneal morphology and the surrounding soft tissue. After the soft tissue was considered safe, delayed open reduction and internal fixation was performed. The time to definite surgery, radiographic alignment, wound complications, time to radiographic union, and hindfoot American Orthopaedic Foot & Ankle Society (AOFAS) scores were recorded. Results: The average follow-up period was 17 months (range, 12-43). The average Böhler angle increased from a mean of −22 degrees (range, −109 to 25) to 25 degrees (range, 0 to 47) after temporary transarticular K-wire fixation. The mean time from temporary pinning to conversion to definite internal fixation was 20 (range, 10-32) days. There were no immediate postoperative complications. The average time to radiographic union was 13.7 (range, 10-16) weeks. The mean AOFAS score was 87 (range, 55-100). No infections or wound complications were reported during the follow-up period. Conclusion: Temporary transarticular pinning for staged calcaneal fracture treatment is safe and effective in restoring the calcaneal morphology. This novel and relatively simple method may facilitate delayed operation and decrease wound-related complications. Level of Evidence: Level IV, retrospective case series.

Reply to comment by Pan et al.: “Lateral tibial plateau fractures- functional outcomes and complications after open reduction and internal fixation”

2021 ◽  
Author(s):  
Sasa Milenkovic ◽  
Milan Mitkovic ◽  
Milorad Mitkovic ◽  
Predrag Stojiljkovic ◽  
Mladen Stojanovic
Keyword(s):  
Internal Fixation ◽  
Functional Outcomes ◽  
Open Reduction ◽  
Tibial Plateau ◽  
Tibial Plateau Fractures ◽  
Lateral Tibial Plateau

scholarly journals Modified Percutaneous Achilles Tendon Lengthening by Triple Hemisection for Achilles Tendon Contracture

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Yangjing Lin ◽  
Jin Cao ◽  
Changgui Zhang ◽  
Liu Yang ◽  
Xiaojun Duan
Keyword(s):  
Achilles Tendon ◽  
Recurrence Rate ◽  
Operative Time ◽  
Achilles Tendon Rupture ◽  
Tendon Lengthening ◽  
Group A ◽  
Achilles Tendon Lengthening ◽  
The Mean ◽  
Group B

Background. Both percutaneous Achilles tendon lengthening by triple hemisection and the traditional open Z-lengthening are effective methods for Achilles tendon contracture. This study aims to evaluate the efficacy and safety of this new therapeutic method, which is based on the percutaneous sliding technique with three hemi-cuts in the tendon, as compared with the traditional open Z-lengthening. Methods. Retrospective analysis of the Achilles tendon contracture cases in our hospital between January 2010 and September 2016 was conducted. Twenty-five cases received percutaneous Achilles tendon lengthening (group A), and 30 patients who underwent open Z-lengthening during the same period were in the control group (group B). Operative time and hospital stay were statistically analyzed. Incision complication, equinus recurrence rate and Achilles tendon rupture morbidity were recorded. The function was assessed by American Orthopaedic Foot & Ankle Society (AOFAS) score. All cases in group A received Magnetic Resonance Imaging (MRI) of ankle preoperatively and in the follow-ups. Results. The mean follow-up period was 42.04 months in group A and 61.7 months in group B. The entire operative time and the mean hospitalization days were lower in group A than in group B. No incision and infection complication occurred in group A. The infection rate in group B was 3.3%. Equinus recurrence rate was 4% in group A and the equinus recurrence rate in group B was 21.4%. In group A, the mean AOFAS score increased from 64 ± 10.16 points preoperatively to 96.08 ± 3.17 at final follow-up, while the score in group B increased from 63.48 ± 6.2 points to 85.4 ± 10.3. MRI showed continuity of the Achilles tendon and homogeneous signal in group A. Conclusion. Modified surgery can significantly reduce the risk of Achilles tendon rupture, provide better balance in soft tissue strength between ankle dorsiflexion and ankle plantarflexion, helping to avoid recurrence of the deformity.

Internal Fixation of Lateral Trochlear Groove Osteochondritis Dissecans With Simultaneous Lateral Retinacular Lengthening in Adolescent Athletes

2021 ◽  
pp. 036354652110478
Author(s):  
Dhong Won Lee ◽  
Joon Kyu Lee ◽  
Young Chang Cho ◽  
Sang Jin Yang ◽  
Seung Ik Cho ◽  
...  
Keyword(s):  
Internal Fixation ◽  
Vertical Jump ◽  
Lysholm Score ◽  
Trochlear Groove ◽  
Adolescent Athletes ◽  
Isokinetic Muscle Strength ◽  
Subjective Score ◽  
The Mean ◽  
Tegner Activity Scale

Background: The goals of operative treatment for the adolescent athlete with unstable osteochondritis dissecans (OCD) lesion are rigid fixation and prevention of recurrence. Purpose: To evaluate clinical and radiological outcomes of internal fixation of lateral trochlear groove OCD with simultaneous lateral retinacular lengthening. Study Design: Case series; Level of evidence, 4. Methods: Adolescent athletes who had undergone internal fixation and simultaneous lateral retinacular lengthening for an unstable OCD lesion of the lateral trochlear groove were retrospectively reviewed. Subjective assessments included the Lysholm score, International Knee Documentation Committee (IKDC) subjective score, Tegner activity scale, and an athletic questionnaire. Functional tests included isokinetic muscle strength, single-leg hop for distance, single-leg vertical jump, and Y-balance. Pre- and postoperative radiographs and magnetic resonance images were reviewed. Results: The mean ± SD age of the 17 patients included in this study was 15.9 ± 0.9 years; last clinical follow-up duration was 37.7 ± 8.1 months. At the last follow-up, the Lysholm score improved from 68.7 ± 15.3 to 93.4 ± 12.4 and the IKDC subjective score from 60.2 ± 14.7 to 88.7 ± 12.7 ( P < .001). The mean Tegner activity scale score was 9.4 ± 0.5 before injury and 8.9 ± 1.2 at the last follow-up ( P = .059). The limb symmetry indices of isokinetic muscle strength, single-leg hop for distance, single-leg vertical jump, and Y-balance improved at the last follow-up; the mean limb symmetry index was ≥85% in each functional test. Regarding the athletic questionnaire, 16 (94.1%) patients were satisfied with the surgery. At the last follow-up, 2 patients had higher ability after returning to sports, 11 had the same ability, and 3 had lower ability than the preinjury level. Postoperative magnetic resonance imaging at 12-month follow-up showed that the OCD lesion appeared healed in 7 (41.2%) patients and partially healed in 9 (52.9%). Conclusion: Internal fixation of lateral trochlear groove OCD with simultaneous lateral retinacular lengthening in adolescent athletes achieved satisfactory clinical and radiological outcomes. Therefore, this combined surgical technique could be considered an effective treatment for lateral trochlear groove OCD, with a high rate of return to sport.

scholarly journals Comparison Between With Kirschner-wires Only And Combined Screw Fixation in Proximal Reverse Chevron osteotomy(PCMO) For Hallux Valgus Deformity

2017 ◽  
Vol 2 (3) ◽  
pp. 2473011417S0002
Author(s):  
Hwa Jun Kang ◽  
Hong-Geun Jung ◽  
Jong-Soo Lee ◽  
Sungwook Kim ◽  
Mao Yuan Sun
Keyword(s):  
Hallux Valgus ◽  
Screw Fixation ◽  
Fixation Method ◽  
Kirschner Wires ◽  
Significant Difference ◽  
Group A ◽  
The Mean ◽  
Group B ◽  
Severe Hallux Valgus

Category: Bunion Introduction/Purpose: Kirschner-wires fixation, sometimes we have encountered pin irritation or pull-out. This is the reason why we consider additional fixation. Moreover, there are few reports according to comparison of fixation method, and Most of them focused on comparison K-wires or screw fixation only. Purpose of study is to compare clinical and radiographic outcome between Kirschner-wires only and combined screw fixation. Methods: The study included two different groups according to fixation methods. One with Kirschner-wires fixation (KW group) included 117 feet(of 98 patients), the other with combined screw fixation (KWS group) 56 feet (of 40 patients) with moderate to severe hallux valgus. Clinically, the preoperative and final follow-up visual analog scale (VAS) pain scores, the preoperative and final follow-up American Orthopaedic Foot & Ankle Society (AOFAS) hallux metatarsophalangeal (MTP)-interphalangeal (IP) scores, and patient satisfaction after the surgery were evaluated. Radiographically, the hallux valgus angle (HVA), intermetatarsal angle (IMA), medial sesamoid position (MSP), and first to fifth metatarsal width (1-5MTW) were analyzed before and after surgery. Results: The mean AOFAS score improved preoperative 65.5 to 95.3 at final follow up in group A, while preoperative 56.5 to 88.6 at final follow up. Pain VAS decreased from 5.7 to 0.5 in group A, whereas from 6.2 to 1.6 in group B. The mean HVA all improved from preoperative 38.5 to 9.3 at final follow up in group A and 34.7 to 9.1 in group B. The mean IMA and MSP also improved significantly at final follow up. In comparative analysis, the IMA did not show significant difference between postoperative and final state in group A, while showed significant increase in group B. Conclusion: We achieved favorable clinical and radiographic outcomes with minimal complications in patient with moderate to severe hallux valgus in both groups. However, this study shows no statistically significant difference in IMA during follow-up period and lower recurrence rate. Therefore we need to consider combined fixation method to provide better stability and can expect lower recurrence rate.

scholarly journals Influence of Ulnar Bow Sign on Surgical Treatment of Missed Bado Type I Monteggia Fracture in Children

2020 ◽  
Author(s):  
Shijie Liao ◽  
Tiantian Wang ◽  
Qian Huang ◽  
Yun Liu ◽  
Rongbin Lu ◽  
...  
Keyword(s):  
Surgical Treatment ◽  
Radial Head ◽  
Monteggia Fracture ◽  
Type I ◽  
Ulnar Osteotomy ◽  
Group A ◽  
The Mean ◽  
Group B ◽  
Stable Reduction

Abstract PurposeThe present study aimed to explore the influence of ulnar bow on the surgical treatment of Bado type I missed Monteggia fracture in children.MethodsThis study is a retrospective review of 24 patients between November 2010 and March 2019. All patients were treated with open reduction of the radial head and ulnar opening wedge osteotomy without annular ligament reconstruction. The mean interval between injury onset and surgery was five months (range: 2–12 months). The average age of participants at the time of surgery was 6.4 years (range: 3–10 years). We evaluated the maximum ulnar bow (MUB) and MUB position (P-MUB) via radiography. The patients were divided into middle group (group A: 14 cases, MUB located at 40% to 60% of the distal ulna) and distal group (group B: 10 cases, MUB located at 20% to 40% from the distal end of the ulna) based on P-MUB. The mean period of follow-up was 37 months (range: 6–102 months).ResultsAt the last follow-up, all the children showed stable reduction of the radial head, and the flexion function of elbow joint improved after operation (P<0.05). Group A presented a larger the ratio of maximum ulnar bow(R-MUB) and angle of ulnar osteotomy(OA) than group B (P<0.05). There was statistically significant difference between group A and Group B in the P-MUB (P < 0.05). The osteotomy angle was positively correlated with the R-MUB (R2 =0.497,P=0.013), The osteotomy angle was positively correlated with the P-MUB (R2=0.731,P=0.000), The R-MUB is proportional to the P-MUB (R2 =0.597,P=0.002). The regression equation of P-MUB and osteotomy angle: Angle=7.064+33.227* P-MUB (R2=0.459, P =0.000).ConclusionWhen the ulnar bow is positioned at the middle ulna, a stable reduction of radial head need to be achieved through a larger angle in the ulnar osteotomy. If the position of maximum ulnar bow (P-MUB) is closer to the middle of the ulna or the ratio of maximum ulnar bow (R-MUB) is larger, the osteotomy angle is larger.

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