Intra-articular Reconstruction Research Articles

Incidence and management of secondary deformities after megaendoprosthetic proximal femur replacement in skeletally immature bone sarcoma patients

IntroductionMegaendoprosthetic reconstruction of bone defects in skeletally immature patients has led to the development of unique complications and secondary deformities not observed in adult patient cohorts. With an increasing number of megaendoprosthetic replacements performed, orthopedic oncologists still gain experience in the incidence and type of secondary deformities caused. In this study, we report the incidence, probable cause and management outcome of two secondary deformities after megaendoprosthetic reconstruction of the proximal femur: hip dysplasia and genu valgum.Materials and methodsRetrospective analysis of 14 patients who underwent primary and/or repeat reconstruction/surgery with a megaendoprosthetic proximal femur replacement between 2018 and 2022.ResultsMean patient age was 9.1 years (range 4–17 years). Stress shielding was observed in 71.4%. Hip dislocation was the most frequent complication (50%). While four dislocations occurred without an underlying deformity, secondary hip dysplasia was identified in 58.3% (n = 7/12) of intraarticular resections and reconstructions, leading to dislocation in 71.4% (n = 5/7). A genu valgum deformity was observed in 41.6% (n = 5/12). The incidence of secondary hip dysplasia and concomitant genu valgum was 42.9% (n = 3/7). Triple pelvic osteotomy led to rebound hip dysplasia in two cases (patients aged < 10 years), whereas acetabular socket replacement led to stable hip joints over the course of follow-up. Temporary hemiepiphyseodesis was applied to address secondary genu valgum.ConclusionsPatients aged < 10 years were prone to develop secondary hip dysplasia and genu valgum following proximal femur replacement in this study. Management of secondary deformities should depend on remaining skeletal growth. Stress shielding was observed in almost all skeletally immature patients.

Description of the Anterior Cruciate Ligament Reconstruction Technique with Mini-Lemaire Type Anterolateral Tenodesis through a Single Femoral Tunnel.

The anterior cruciate ligament (ACL) injury causes anteroposterior and rotational instability in the knee. Intra-articular reconstructions often fail to achieve satisfactory rotational control, leading to persistent complaints of instability and subjecting the neo-ligament to increased stress. Young patients with high athletic demands and grade 2 or 3 pivot-shift often have a higher risk of re-rupture after isolated ACL reconstruction. Over the years, various techniques have been developed to address such situations. Among the described techniques, one of the most commonly used is the modified or "mini-Lemaire" lateral extra-articular tenodesis. Biomechanical studies demonstrate the versatility of the technique due to its relatively isometric behavior in flexion angles of 0-60° when the graft is introduced deeply to the lateral collateral ligament. It offers the possibility of fixation at different anatomical positions on the lateral femoral condyle and at different degrees of flexion. The objective of this study is to describe an accessible, reproducible technique that relies on materials widely available in our environment.

Intercalary Resection of the Tibia for Primary Bone Tumors: Are Vascularized Fibula Autografts With or Without Allografts a Durable Reconstruction?

Intercalary Resection of the Tibia for Primary Bone Tumors: Are Vascularized Fibula Autografts With or Without Allografts a Durable Reconstruction?

A Lateral Extra-articular Procedure Reduces the Failure Rate of Revision Anterior Cruciate Ligament Reconstruction Surgery Without Increasing Complications: A Systematic Review and Meta-analysis

Background: Lateral extra-articular procedures are becoming increasingly popular in association with anterior cruciate ligament (ACL) reconstruction, especially in patients with persistent rotatory instability and in a high-risk population. However, few studies have investigated the outcomes of the lateral extra-articular procedure as an associated procedure in an ACL revision (R-ACLR) setting and its benefit with respect to isolated intra-articular reconstruction. Hypothesis: Lateral extra-articular procedures reduce the failure rate of revision ACL reconstruction (R-ACLR). Purpose: To compare subjective outcomes, knee stability, and failure and complication rates between patients who underwent ACL revision with and without an associated lateral extra-articular procedure. Study Design: Systematic review and meta-analysis; Level of evidence, 3. Methods: A systematic search of the PubMed, Cochrane, and OVID databases was performed on September 2022 in accordance with the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. Eligible studies were trials directly comparing patients who had isolated ACL revision with patients who had ACL revision associated with lateral extra-articular procedures at a minimum follow-up of 2 years. A meta-analysis was performed, and bias and the quality of the evidence were rated according to the Newcastle-Ottawa Scale. The meta-analysis was conducted according to the PRISMA guidelines. Results: Eight studies were included: a total of 334 patients were treated with isolated revision (isolated (R-ACLR)) and 342 treated with combined revision and a lateral extra-articular procedure (combined (R-ACLR)). For the failure rate, the meta-analysis showed a significantly decreased relative risk reduction of 54% (P = .004) in patients with combined (R-ACLR) with respect to isolated R-ACL, whereas no difference in complication rate was observed. The combined (R-ACLR) group demonstrated a decreased risk ratio of 50% (P = .002) for having a positive pivot-shift test result and a relative risk reduction of 68% (P = .003) for having a grade 2-3 pivot shift when compared with the isolated (R-ACLR) group. Finally, no significant differences were observed among the lateral extra-articular procedures. Conclusion: The addition of a lateral extra-articular procedure to revision ACL significantly reduced the failure rate and postoperative pivot shift without increasing the complication rate. Anterolateral ligament reconstruction and a lateral extra-articular procedure with iliotibial band were effective in improving the outcomes of revision ACL reconstruction. Further high-level studies could help to clarify which subgroup of patients could particularly benefit from an anterolateral procedure in the context of ACL revision.

Anterior Cruciate Ligament Reconstruction With Iliotibial Band Autograft in Skeletally Immature Prepubescent Children: A Physeal-Sparing Technique

Background: As there has been an increasing incidence of anterior cruciate ligament (ACL) tears in children and adolescents in the past few decades, nonoperative management is seen to result in less favorable clinical outcomes, resulting in meniscal and cartilage damage, and arthritic changes. Despite the risk of iatrogenic physeal injuries with operative approach, several reconstruction options, such as physeal-sparing techniques for skeletally immature patients, are described to restore joint stability. Indications: We bring a combined extra-articular and intra-articular ACL reconstruction technique using autogenous iliotibial band (ITB), which is indicated for prepubescent patients (Tanner stages 1 or 2) with open physes, significant growth potential (≤11 years for girls and ≤12 years for boys) and smaller knees, where an all-epiphyseal ACL reconstruction would lack epiphyseal space Technique Description: The technique consists of a modified MacIntosh intra-articular and extra-articular ITB reconstruction, described by Micheli and further characterized by Kocher. The central portion of the ITB is harvested proximally (at least 15 cm) and left attached to Gerdy's tubercle distally. The harvested graft is brought from over-the-top posteriorly and passed under the intermeniscal ligament anteriorly through an epiphyseal groove on the tibia. Results: The outcomes shown for the Kocher ITB ACL reconstruction technique are favorable at a mean follow-up of 5.3 years: from 44 patients, 41 returned to sports involving cutting or pivoting, and the revision rate was low at 4.5%. Discussion/Conclusion: The awareness of physeal injury related to the operative treatment of ACL tears in the pediatric population has resulted in several physeal-sparing and physeal-respecting techniques of reconstruction. Some of these have shown to reduce the risk of physeal damage, maintaining stability and providing excellent functional outcomes, with low revision rates in long-term follow-up and minimal risk of growth disturbance. Patient Consent Disclosure Statement: The author(s) attests that consent has been obtained from any patient(s) appearing in this publication. If the individual may be identifiable, the author(s) has included a statement of release or other written form of approval from the patient(s) with this submission for publication.

Lateral Extra-articular Tenodesis Combined with Intra-articular ACL Reconstruction in Management of Anterolateral Knee Instability

Lateral Extra-articular Tenodesis Combined with Intra-articular ACL Reconstruction in Management of Anterolateral Knee Instability

Adding a Lateral Extraarticular tenodesis to ACL Reconstruction in 2022

Lateral extra-articular tenodesis (LET) is a procedure used to control anterolateral rotatory laxity. It was first described to treat the ACL deficient knee prior to advent of intra-articular reconstruction. The aim was adding a lateral soft tissue restraint away from the central pivot of the knee to improve rotational control. The recent evidence from the STABILITY RCT has shown that the addition of LET to hamstring autograft ACLR in young patients (14-25 years ) results in clinically relevant reduction in graft rupture and persistent rotatory laxity at 2 years postoperatively. This has subsequently been verified by various authors that adding a lateral soft tissue restraint to an intraarticular ACL reconstruction reduced both primary and revision ACL graft failures. The current indication for adding an LET to ACL surgery are : in high grade knee laxity in clinic detected on physical examination, patients with joint laxity, chronic ACL injuries, athletes returning to pivot sports after surgery and in revision ACL cases.

Combined lateral extra-articular tenodesis and anterior cruciate ligament reconstruction: risk of osteoarthritis.

Lateral extra-articular tenodesis (LET) procedure, combined with an intra-articular reconstruction of the anterior cruciate ligament (ACL), is used to reduce rotational laxity and the risk of graft failure. However, concern of overtightening of the lateral compartment and subsequent osteoarthritis remains. The aim of this study is to evaluate the degenerative changes in the lateral compartment and to compare the clinical and radiographical results between two LET techniques. Eighty-three patients (86knees) were retrospectively reviewed at a mean of 67.7months (range 49-85months). Forty-two knees had an ACL reconstruction combined with a LET procedure according to the modified Lemaire technique and 44 knees according to the modified Coker-Arnold technique. IKDC, Lysholm, Tegner and VAS scores were used. Osteoarthritis was radiographically evaluated by the Kellgren-Lawrence classification. There were 12 patients (28.6%) in the modified Lemaire subgroup and 13 patients (29.5%) in the modified Coker-Arnold subgroup that had doubtful or mild radiologic signs of osteoarthritis. No patients had moderate or severe signs at final follow-up. There was no significant difference in radiological signs of osteoarthritis. In the modified Lemaire subgroup, we report a mean IKDC of 86.31 (± 13.794), a mean Lysholm of 87.83 (± 12.802) and a mean Tegner of 5.38 (± 2.556). In the modified Coker-Arnold subgroup, a mean IKDC of 87.27 (± 11.653), a mean Lysholm of 91.89 (± 8.035) and a mean Tegner of 5.16 (± 2.420) were reported. There were no statistical significant differences between both techniques. In eight patients, a complication was identified, 3 of which had a failure of the ACL reconstruction. The chosen LET-technique seems to have minimal effect on both the clinical and the radiographic results. The LET is a safe procedure, and it does not increase the risk of osteoarthritis in the lateral compartment.

One-Stage ACL Revision Using a Bone Allograft Plug for a Semianatomic Tibial Tunnel That Is Too Anterior

Revision of an anterior cruciate ligament (ACL) reconstruction can be performed as a one-stage or two-stage surgery. Several factors must be taken into consideration when making this choice, especially the size and position of the existing tunnels. When the tibial tunnel is semianatomic, it is difficult to make a new tunnel in the correct position without overlapping the existing tunnel. For this reason, we have developed a one-stage ACL revision surgery that uses a bone allograft plug. When it comes to choosing a reconstruction technique, we believe that combined intra-articular and extra-articular reconstruction with the iliotibial band is suitable when the hamstring tendons are not available, combined with clinical findings of translational and rotational instability. Because the existing tunnels require reorientation, a new femoral tunnel can be created by outside-in drilling to eliminate the risk of overlap, while an allograft bone plug can be used to fill the overly anterior tibial tunnel and allow us to drill the correct tibial tunnel right away. In our hands, this is a safe and effective technique, but longer follow-up is needed to validate its indications.

Biomechanical cyclic loading test of a synthetic ligament fixation system used for intra-articular stabilization of deficient canine stifles.

Background:Cranial cruciate ligament rupture (CCLr) is the most common cause of hind limb lameness in dogs. Currently, surgical management of CCLr is mostly performed using tibial osteotomy techniques to modify the biomechanical conformation of the affected stifle. These surgical techniques have a significant complication rate, associated with persistent instability of the stifle which may lead to chronic postoperative pain. Over the last decade, studies have been published on various techniques of anatomical caudal cruciate ligament reconstruction in veterinary practice, using physiological autografts or woven synthetic implants.Aim:The aim of this ex vivo biomechanical study is to investigate the ex vivo dynamic biomechanical behavior of a synthetic implant [ultrahigh molecular weight polyethylene (UHMWPE) implant] fixed with interference screws for the treatment of CCLr in dogs, according to a fatigue protocol (48 hours per test).Methods:Seven stifles from four skeletally mature canine cadavers were implanted with the synthetic implant. It was fixed with four interference screws inserted in transversal and oblique tunnels in both the distal femur and the proximal tibia. For each case, 100,000 cycles were performed at 0.58 Hz, with traction loads ranging from 100 to 210 N.Results:Neither screw-bone assembly rupture nor a pull-out issue was observed during the dynamic tests. Linear stiffness of the implants associated with a fixation system with four interference screws increased over time. The final displacement did not exceed 3 mm for five of the seven specimens. Five of the seven synthetic implants yielded to a lengthening in functional range (0–3 mm). Linear stiffness was homogeneous among samples, showing a strong dynamic strength of the interference screw-based fixations of the UHMWPE implant in the femoral and tibial bones.Conclusion:This study completes the existing literature on the biomechanical evaluation of passive stifle stabilization techniques with a testing protocol focused on cyclic loading at a given force level instead of driven by displacement. These biomechanical results should revive interest in intra-articular reconstruction after rupture of the CCLr in dogs.

A Comparative Study on Functional Outcomes of Fixed Versus Adjustable Length-Loop Device for Femoral Fixation of Graft in Anterior Cruciate Ligament Reconstruction

A Comparative Study on Functional Outcomes of Fixed Versus Adjustable Length-Loop Device for Femoral Fixation of Graft in Anterior Cruciate Ligament Reconstruction

Application of Suspension Fixation with Button Plates for Patients with Distal Radioulnar Joint Dislocation: A Case Series.

ObjectiveThe aim of the present study was to assess the effect of suspension fixation with button plates on the reconstruction of the distal radioulnar joint dislocation (DRUJ).MethodsThis was a case series of six patients (two men and four women) who underwent suspension fixation with button plates for DRUJ dislocation between January 2015 and May 2017. Physical examination, radiography, MRI, functional activity of the wrist joint, grip strength of the wrist joint, Garland–Werley wrist score, Mayo wrist score, and visual analog scale (VAS) score were used to evaluate the effect of this procedure. All patients were followed up every 3 months. The evaluation time point was 12 months after the operation. Comparisons of the functional indexes of wrist function before and after the operation were performed using paired statistical tests.ResultsThe mean range of motion of the affected limb was 70° at forearm pronation and 75° at forearm supination. The subjective assessments and tests of the motor function of the wrist showed improvement after surgery. The Garland–Werley wrist score was 13.50 ± 2.66 preoperatively, the Mayo wrist score was 56.67 ± 18.35, and the VAS score was 4.83 ± 1.17. The Garland–Werley wrist score was 2.83 ± 1.33 postoperatively at 12 months, the Mayo wrist score was 87.5 ± 6.89, and the VAS score was 0.50 ± 0.55. At 12 months, the Garland–Werley wrist score, the Mayo wrist score, and the VAS score showed significant improvements when compared with those before surgery (P = 0.000, P = 0.003, and P = 0.000, respectively). Radiographic examination revealed that the internal fixation device was in place, and no dislocation of the DRUJ could be observed. None of the patients had internal fixation device removal or re‐dislocation of the DRUJ. None of the patients had re‐dislocation of the DRUJ. No secondary ulnar or radial fractures and nerve injury were reported during and after surgery. No tumor recurrence was observed in patients with giant cell tumors of the tendon sheath. No loosening and displacement of screws were reported.ConclusionThe new method of suspension fixation with button plates for the surgical reconstruction of a DRUJ dislocation is simple, with minimal trauma, and maintains the stability of the DRUJ without the need for intra‐articular or extra‐articular reconstruction of the ligament. Furthermore, it allows early functional exercise and achieves satisfactory postoperative functional recovery.

Resurfaced allograft-prosthetic composite for distal femur reconstruction in children with bone tumor.

Reconstruction of the distal femur in children following resection of bone sarcoma is challenging. The main problem in children is the small size of bone and a possible limb-length discrepancy at the end of skeletal growth secondary to the loss of the physes. We reported the results of a new surgical technique for distal femur reconstruction after bone tumor resection in children. We analyzed 5 patients with distal femoral sarcomas who underwent intra-articular resection and reconstruction with resurfaced allograft-prosthetic composite at a mean follow-up of 70 months. There were 2 males and 3 females, with a mean age of 10 years (range 8-12) at the time of the diagnosis. All patients were affected by high-grade osteosarcoma. The patients' medical records were reviewed for clinical and functional outcomes as well as post-operative complications. The functional evaluation of the patients was done at the end of the follow-up using Musculoskeletal Tumor Society scoring system. The minimal follow-up was 24 months. At the last follow-up, 4 patients were continuously disease-free. We excluded one patient who died of disease secondary to lung metastases 16 months after the surgery. Complications occurred in 2 of 4 patients at 17 months and 24 months, respectively. One patient developed deep infection who required the removal of the original reconstruction and, once the infection was treated, the patient underwent reconstruction with an expandable prosthesis. An allograft fracture occurred in another of the 4 patients at 24 months after the first surgery, thus the original reconstruction was removed and the patient underwent reconstruction with modular prosthesis. In the two patients who retained the original reconstruction at the time of their latest follow-up, the mean implant survival time was 70 months. These patients had an excellent MSTS score (29.5 points) and walked without support or limitations with an active knee range of motion of > 90° and complete active extension of the knee. No degenerative changes of the articular surface of the proximal tibia and the patella were observed at the time of the last follow-up. Growth of the physis of the proximal tibia was observed in all the patients during follow-up and no angular deformity of the joint was observed. The limb discrepancy was 4 cm and 2 cm, respectively. Resurfaced allograft-prosthetic composite may represent an alternative surgical technique for distal femur reconstruction in children with bone sarcomas. Although its success is limited by high risk of complications, resurfaced allograft-prosthetic composite seems to be a viable option to preserve the bone stock and the physis of the proximal tibia in selected young patients, minimizing a potential limb-length discrepancy at the end of the skeletal growth.

Clinical assessment and comparison of ACL reconstruction using synthetic graft (Neoligaments versus FiberTape).

Due to the low potential for primary biological healing of the anterior cruciate ligament (ACL), the most popular approach is currently reconstruction using a graft. Recent research indicates that the technique of strengthening a damaged ligament with synthetic tapes (internal bracing) may be an alternative to reconstructive treatment, especially in cases of partial ACL damage. To compare and evaluate the possibility of using a synthetic graft (Neoligaments or FiberTape) to treat partial lesions of the ACL. This was a retrospective cohort study. Selected from a pool of 128 patients undergoing primary unilateral intra-articular ACL reconstruction due to partial lesion of the ACL, group I (Neoligaments) and group II (FiberTape) each included 30 patients. Range of motion (ROM), the Lachman test, the anterior drawer test and the pivot-shift test, the Lysholm Knee Scoring Scale, and International Knee Documentation Committee (IKDC) 2000 scale were used for assessment. Follow-up was carried out after 2 years. The knee joint regained anterior stability in both the subjective and objective assessments in all patients in both groups. The subjective results were respectively: in group I, 97.2 ±3.2 points on the Lysholm scale and 93.9 ±6.1 points on the IKDC 2000 scale; in group II, 96.1 ±4.9 points on the Lysholm scale and 93.2 ±6.8 points on the IKDC 2000 scale. Group comparison of the results of the IKDC 2000 scale, Lysholm Scale and ROM obtained postoperatively showed no statistically significant differences between groups. Reconstruction of partial ACL lesions using a synthetic graft allows regained stability of the knee joint. The results of subjective assessment are comparable with the functional assessment results. The comparison between Neoligaments and FiberTape shows the same functional and objective results, although FiberTape is preferable from an economical perspective.

Combined Anterior and Anterolateral Stabilization of the Knee With the Hamstring Tendons

Anterior cruciate ligament reconstruction allows good control of sagittal laxity but insufficient rotary laxity control. Our objective is to describe an original lateral extra-articular tenodesis using gracilis in addition to an intra-articular reconstruction using the semitendinosus in a short 4-strand graft. The principles are as follows: The femoral tunnel for intra-articular and extra-articular reconstruction is unique, the femoral attachment is posterior and proximal to the lateral epicondyle, the graft is under the lateral collateral ligament, and the tibial insertion is isometric from 0° to 60° between the Gerdy tubercle and the fibular head.

Capsulo-osseous Layer Retensioning and Distal Kaplan Fiber Surgical Reconstruction: A Proposed Anatomical Lateral Extra-articular Tenodesis Approach

Anterior cruciate ligament intra-articular reconstruction may require extra-articular reinforcement in certain situations. As knee lateral region anatomical and biomechanical knowledge has increased with new research, it has been reported that the iliotibial band is important in the anterolateral stabilization of the knee. Possible indications for a “more anatomical” extra-articular tenodesis focusing on capsulo-osseous layer tensioning and distal Kaplan fibers reconstruction are reported, surgical approach details are described, and scientific data that gives support for this procedure are discussed.

The deep lateral femoral notch sign: a reliable diagnostic tool in identifying a concomitant anterior cruciate and anterolateral ligament injury.

The aim of the present study was to investigate the validity and reliability of the deep lateral femoral notch sign (DLFNS) in identifying a concomitant anterior cruciate ligament (ACL)/anterolateral ligament (ALL) rupture and predicting the clinical outcomes following an anatomical single-bundle ACL reconstruction. It was hypothesized that patients with a concomitant ACL/ALL rupture would have an increased DLFNS compared to patients without a concomitant ACL/ALL rupture. The lateral preoperative radiographs and MRI images of 100 patients with an ACL rupture and 100 control subjects were evaluated for the presence of a DLFNS and ACL/ALL rupture, respectively. The patients were evaluated clinically preoperatively and at a minimum 1 year following the ACL reconstruction. A receiver operator curve (ROC) analysis was performed to define the optimal cut-off value of the DLFNS for identifying a concomitant ACL/ALL injury. The relative risk (RR) was also calculated to determine whether the presence of the DLFNS was a risk factor for residual instability or ACL graft rupture following an ACL reconstruction. The prevalence of DLFNS was 52% in the ACL-ruptured patients and 15% in the control group. At a minimum 1-year follow-up, 35% (6/17) of the patients with DLFNS > 1.8mm complained of persistent instability, and an MRI evaluation demonstrated a graft re-rupture rate of 12% (2/17). In patients with a DLFNS < 1.8mm, 8% (7/83) reported a residual instability, and the graft rupture rate was 2.4% (2/83). A DLFNS > 1.8mm demonstrated a sensitivity of 89%, a specificity of 95%, a negative predictive value of 98%, and a positive predictive value of 89% in identifying a concomitant ACL/ALL rupture. Patients with a DLFNS > 1.8mm had 4.2 times increased risk for residual instability and graft rupture compared to patients with a DLFNS ≤ 1.8mm. A DLFNS > 1.8mm could be a clinically relevant diagnostic tool for identifying a concomitant ACL/ALL rupture with high sensitivity and PPV. Patients with a DLFNS > 1.8mm should be carefully evaluated for clinical and radiological signs of a concomitant ACL/ALL rupture and treated when needed with a combined intra-articular ACL reconstruction and extra-articular tenodesis to avoid a residual rotational instability and ACL graft rupture. III.

Clinical and functional evaluation of primary anterior crucial ligament reconstruction by using allograft

The reconstruction of the anterior cruciate ligament (ACL) of the knee joint is the gold standard in complete ACL rupture treatment. One of the central discussion topics is choice of graft. To assess the outcome of treatment after primary ACL reconstruction using allograft. The study was a retrospective cohort study. Out of 372 male patients who had undergone primary unilateral intra-articular ACL reconstruction using strict inclusion and exclusion criteria, 61 patients who qualified for the study took part. Group I was made up of 31 patients with allograft, while Group II consisted of 30 patients involved with autograft. The Lachman test, Pivot-Shift test, Lysholm Knee Scoring scale, and 2000 International Knee Documentation Committee (IKDC) were used to evaluate the results. Follow-up time was 18 months. The knee joint regained anterior stability in subjective and objective assessments in all the patients in both groups. The subjective results were the following: in Group I, 96.6 ±3.08 points on the Lysholm scale and 94.79 ±6.53 points on the IKDC 2000 scale, while in Group II, 98.00 ±1.9 points on the Lysholm scale and 94.81 ±5.6 points on the IKDC 2000 scale. The group comparison of the results of the IKDC 2000 and Lysholm Scale obtained postoperatively showed no statistically significant differences between the 2 groups. Primary ACL reconstruction using an allograft is an effective procedure to counteract instability of the anterior knee joint. Comparative analysis of the results of primary ACL reconstruction in the treatment of anterior knee instability using autograft or allograft gives grounds for the possibility of individual selection of graft depending on what the patient's expectations are.

Posterior Glenoid Augmentation With Extra-articular Iliac Crest Autograft for Recurrent Posterior Shoulder Instability

Several techniques have been described for bone block augmentation as a treatment for posterior shoulder instability, including intra-articular distal tibial allograft and extra-articular iliac crest autograft. Although indications are not yet well defined, these bone augmentation procedures are considered in patients with glenoid bone loss, increased glenoid retroversion, previous failed posterior soft-tissue repair, and insufficient posterior capsulolabral tissue. In patients with posterior glenoid bone loss, the senior author (P.J.M.) recommends intra-articular glenoid reconstruction with a fresh distal tibial osteoarticular allograft. In patients with insufficient posterior capsulolabral tissue, the senior author prefers an extra-articular iliac crest autograft to buttress the posterior soft-tissue restraints. This technique guide outlines extra-articular iliac crest autograft treatment for recurrent posterior shoulder instability in patients with insufficient posterior soft tissues due to prior failed surgery. After an open capsulolabral repair is performed using suture anchors, the bone block is placed extra-articularly on the posterior glenoid neck.

Biomechanical and Histopathological Analysis on Different Approaches for Anterior Cruciate Ligament Reconstruction

Anterior cruciate ligament (ACL) injury is one of the common injuries in sports and vehicle accidents. ACL decreases joint stability, leading to increased incidence of osteoarthritis. Although there are various approaches for the reconstruction of ACL, no consensus has been reached on the safest and most effective method to achieve joint stability. Here we have compared the biomechanical and histopathological outcomes of three different approaches: intra-articular ACL reconstruction, remnant-preserving and re-tensioning and non-remnant-preservation technique, using finite element analysis, histopathologic observation as well as qPCR and western blot analysis. Results of the current study showed no significant differences among the three methods concerning biomechanical, histopathological analysis and mRNA and protein levels of chondrocyte apoptotic markers such as JNK, MMP-1 and SIRT1 (P &gt; 0 05). Those results indicated that remnant preservation techniques such as intra-articular ACL reconstruction and remnant-preserving and re-tensioning are similar in their ability to achieve joint stabilization and prevent chondrocyte regeneration to non-remnantpreservation technique.