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Purpose To systematize the surgical outcomes of anatomic and non-anatomic reconstruction in patients with chronic acromio-clavicular joint (ACJ) instability and determine which technique is superior. Methods This review was conducted according to the PRISMA guidelines. PubMed and Cochrane Library databases were searched up to April 30th, 2018 for original articles that assessed the outcomes of one or more surgical techniques of anatomic and non-anatomic reconstruction in patients with chronic ACJ instability. The Methodological Index for Non-randomized Studies (MINORS) was used to assess study quality. Pre-to-post meta-analysis was performed for both anatomic and non-anatomic reconstructions. Results Twenty-eight studies were included comprising 799 patients (mean age of 36.6 years old and 84% males) with a mean follow-up of 34.6 months (range 13 to 74). Surgical techniques included anatomic (tendinous or synthetic grafts/constructs) and non-anatomic reconstruction (Weaver–Dunn or Modified Weaver–Dunn, conjoined tendon transfer, or temporary hook plate). There were significant pre-to-post improvements on the constant score with an average improvement ranging from 11.1 to 50.7 ( p  < 0.01). Average failure rate was 7.6% (7.5% for anatomic and 8.5% for non-anatomic reconstruction). Non-comparative studies had a mean MINORS score of 9 points (out of 16) and comparative studies 17 (out of 24) with excellent interrater agreement ( k  = 0.910). Conclusion Both anatomic and non-anatomic ACJ reconstructions provide significant post-operative improvements, but definitive conclusions on optimal technique remain elusive. Notwithstanding, comparative studies support the use of anatomic ACJ reconstruction which should be preferably used. However, until superiority is demonstrated by robust studies, surgeons should supplement their decision-making with experience and patient preference. Level of evidence IV.

Imaging plays a central role in the postoperative management of acromioclavicular (AC) joint separations. There are more than 150 described techniques for the surgical management of AC joint injuries. These procedures can be categorized as varying combinations of the following basic techniques: a) soft-tissue repair, b) trans-articular AC joint fixation, c) coracoclavicular (CC) fixation, d) non-anatomic reconstruction of the CC ligaments, e) anatomic reconstruction of the CC ligaments, f) distal clavicle resection, and g) dynamic muscle transfer. The goals of this article are to describe the basic techniques for the surgical management of AC joint separations with an emphasis on technique-specific complications and postoperative imaging assessment.

Successful total shoulder arthroplasty is, in part, dependent on anatomic reconstruction of the glenohumeral joint. The purpose of this study was to evaluate the post-operative anatomy of total shoulder arthroplasty with an anatomic implant design in patients with primary glenohumeral osteoarthritis and compare it to published normative anatomic measurements. Fifty-one patients (56 shoulders) with primary glenohumeral osteoarthritis were treated with a press-fit humeral component as part of a total shoulder arthroplasty (Aequalis, Tornier, Edina, Minnesota). Analysis of postoperative true anterior posterior radiographs was performed with use of a custom software algorithm. The mean humeral inclination (head-shaft angle), mean humeral implant anatomical humeral axis, mean greater tuberosity height, and mean humeral head center offset (medial offset) were 135.4±5.1°, 1.73±1.7°, 6.9±2.4 mm, and 3.8±1.8 mm, respectively. All parameters were within the ranges reported in the literature for normal shoulders except the mean humeral head center offset, which was less than reported in the literature. Anatomic parameters of a total shoulder arthroplasty can be achieved with an anatomically designed, modular adaptable press-fit design. Reduced medial humeral head center offset was likely dependent upon implant specific design parameters.

Purpose Chronic grade 3 tears of the medial collateral ligament and posterior oblique ligament may result in valgus laxity and anteromedial rotational instability after an isolated or multiligament injury. The purpose of this study was to prospectively analyze the restoration of physiologic medial laxity as assessed on stress radiography and patient reported subjective functional outcomes in patients who undergo an anatomic medial knee reconstruction. Methods This was a prospective study which included patients with chronic (> 6 weeks old) posteromedial corner injury with or without other ligament and meniscus lesions. Pre- and post-operative valgus stress radiographs were performed in 20° knee flexion and functional outcome was recorded as per the International Knee Documentation Committee (IKDC) and Lysholm scores. All patients underwent anatomic medial reconstruction with two femoral and two tibial sockets using ipsilateral hamstring tendon autograft. Simultaneous ligament and meniscus surgery was performed as per the associated injury pattern. All patients were followed up for a minimum of 24 months post-surgery. Results Thirty-four patients (23 males, 11 females) were enrolled in the study and all were available till final follow-up of mean 49.7 ± 14.9 months. The mean age was 30.6 ± 7.9 (18–52 years). Two patients had isolated medial sided lesions and 23 had associated ligament injuries. The mean follow up was 49.7 (24–72) months. The mean IKDC score improved from 58 ± 8.3 to 78.2 ± 9.5 ( p  < 0.001). Post-operatively there were 15 excellent, 11 good and 8 fair outcomes on Lysholm score. The mean pre-operative valgus side-to-side opening improved from 7.5 ± 2.5 mm to 1.2 ± 0.7 mm on stress radiography ( p  < 0.001). Conclusion Anatomic reconstruction of the superficial medial collateral and posterior oblique ligaments restore stability in a consistent manner cases of chronic grade 3 instability. The objective functional results, subjective outcomes and measures of static medial stability are satisfactory in the short term. Level of Evidence IV

Purpose The primary objective was to compare the functional outcomes after an isolated MPFL reconstruction using either a quasi-anatomical technique (group A) or an anatomical MPFL reconstruction (group B). The secondary objectives were to compare the rates of redislocation, range-of-motion and subjective patellar instability (Smillie test). Methods A multicenter longitudinal prospective comparative study was performed. Group A had 29 patients and 28 were included in Group B. Patients with trochlear dysplasia types C and D and patients who had undergone a trochleoplasty, a distal realignment or patella distalization concurrently with MPFL reconstruction were excluded. The main evaluation criterion was the Kujala functional score. Results The mean postoperative Kujala was 90.4 (89.4 in group A and 92.1 in group B). Upon comparing the mean difference between pre- and post-operative values, no differences were detected between the two groups (n.s). Conclusions Isolated quasi-anatomical MPFL reconstruction using a gracilis tendon autograft for recurrent patellar dislocation provides outcomes as good as the isolated anatomical MPFL reconstruction in patients with no trochlear dysplasia up to those with trochlear dysplasia type A and B at the 2–5 years follow-up. Level of evidence Level IV.

Purpose The purpose of this study was to investigate if the calcaneofibular ligament (CFL) presents morphologic variants and measure the morphometrics of the ligament and its footprints Methods An anatomical study of 47 fresh-frozen below-the-knee ankle specimens was performed. Lateral ankle structures were dissected to expose the CFL. Overdissection was avoided to not modify the native morphology. The morphology (number and orientation of CFL bundles) and measurements of CFL insertions were recorded with ankle secured in neutral position. Results Four distinct morphological-oriented shapes of the CFL were observed. These included single bundle, Y-shape double bundle, V-shape double bundle, and associated with the lateral talocalcaneal ligament. The most frequent CFL morphology observed was the single bundle and the Y-shape double bundle, present in 21 (44.7%) and 13 (27.7%) ankles. The V-shape double bundle and the CFL double bundle associated with the lateral talocalcaneal ligaments were less common, appearing only in eight (17.0%) and five (10.6%) ankles. The CFL length was higher in single bundle and Y-shaped double bundle CFL variants, about 30 mm each. Footprint morphometrics were heterogenous amongst the different CFL variants. Conclusion The CFL presents four distinct morphological-oriented shapes. The double bundle, V-shaped and Y-shaped CFL variants are uncommon and poorly reported in the literature. Their relation to the lateral talocalcaneal ligament and the inferior fascicle of the anterior talofibular ligament requires further research. The CFL morphology provides detailed knowledge of CFL anatomy that can improve diagnostic procedures. Furthermore, this information can fine-tune graft selection and sizing and allow a more precise anatomic placement during surgical reconstruction.

Background Accurate femoral tunnel placement is essential for successful anatomical intra-articular reconstruction of the cranial cruciate ligament (CrCL), a standard treatment for anterior cruciate ligament disease in humans. Surgical outcomes are influenced by multiple factors related to tunnel placement, including ligament footprint restoration, tunnel length, and graft bending angle (GBA), among others. However, no consensus has been reached regarding the optimal placement of the femoral tunnel for CrCL reconstruction in dogs. This study aimed to investigate the effects of various femoral tunnel entry (FTE) points on these key parameters to determine favourable tunnel locations for canine CrCL reconstruction. Methods The influences of various FTE points were evaluated based on six parameters: footprint coverage, footprint overhang, footprint similarity, tunnel length, tunnel‐face angle, and GBA. Three‐dimensional femoral models reconstructed from CT scans of 25 canine cadaveric hindlimbs were used to simulate tunnel placement. In addition, tibiofemoral kinematic data from 13 client-owned dogs during treadmill gait were analysed to quantify the GBA associated with each simulated tunnel. Results A more proximal extracapsular tunnel aperture relative to Blumensaat's line provided greater footprint coverage, improved similarity, and longer tunnel length. However, along the cranial-caudal axis, a trade-off emerged between these factors and GBA, suggesting that a mid-range position may offer the most balanced compromise. Conclusion Placing the FTE point proximally is preferable, while a mid-range cranial-caudal position may best balance key factors affecting postoperative outcomes in dogs.

Purpose To compare the mid- to long-term clinical and radiological outcomes of the confluent L-shaped tunnel technique with the Y-graft technique for anatomic lateral ankle ligament reconstruction. Methods This retrospective study involved 41 patients who underwent lateral ankle ligament reconstruction between 2013 and 2018. Based on the tunnel direction and tendon fixation method at the fibula side, patients were divided into two groups, with 17 patients in the L-shaped tunnel group and 24 patients in the Y-graft group. The American Orthopaedic Foot and Ankle Society (AOFAS) score, visual analogue scale (VAS) pain score, Tegner score, and Karlsson score were evaluated and compared preoperatively and at follow-up. Anterior talar translation and talar tilt at stress radiographs, postoperative sprain recurrence, range of motion (ROM) restriction, sensory disturbance, etc., were also collected and compared. Results The mean follow-up times were 72 and 42 months for the L-shaped group and Y-graft group, respectively. The median VAS pain score, Tegner score, AOFAS score, Karlsson score significantly improved from a preoperative level in both groups (all with p  < 0.01). No significant difference was found between the two groups regarding the changes from preoperatively to postoperatively except for the VAS pain score reduction (1.58 ± 1.58 in the L-shaped group vs. 2.53 ± 1.29 in the Y-graft group, p  = 0.035). The incidence of flexion–extension ROM restriction (≥ 5°) was significantly higher in the Y-graft group (41.2%) than in the L-shaped group (12.5%) ( p  = 0.035). Conclusions Both the confluent L-shaped tunnel technique and the Y-graft technique significantly improved symptoms, ankle function, and radiographic outcomes in patients with chronic lateral ankle instability (CLAI) at mid- to long-term follow-up. The confluent L-shaped tunnel technique resulted in lower rates of flexion–extension ROM restriction, while the Y-graft technique showed better VAS pain reduction. This result could provide further evidence for the surgical treatment of CLAI. Level of evidence III.

PurposeTreatment of chronic lateral ankle instability (CLAI) with poor remnant quality is challenging. The aim of the present study was to evaluate clinical results and complications of anatomic reconstruction of the lateral ligaments using allograft tendon and suspensory fixation in the treatment of such patients.MethodsOne hundred and eight patients with CLAI, who were treated surgically using anatomic reconstruction with allograft tendon and suspensory fixation between April 2016 and January 2018 at our hospital, were retrospectively analysed. None of the patients had sufficient ligament remnants for the modified Broström procedure during the intraoperative evaluation. Eighteen patients were excluded. Seventeen patients were lost to follow-up and 73 patients completed the study. The mean duration of instability symptoms was 39.1 months (range, 6–480 months). The mean follow-up time was 57.5 months (range, 48–69 months). Clinical results were evaluated using the Karlsson scoring scale, American Orthopaedic Foot and Ankle Society-Ankle and Hindfoot (AOFAS-AH) score, visual analogue scale (VAS), patients’ subjective satisfaction, and incidence of complications. Mechanical stability was evaluated using the varus talar tilt angle (TTA) and anterior talar displacement (ATD).ResultsThe AOFAS-AH scores significantly improved from 67.7 ± 8.5 points to 89.8 ± 9.5 (p < 0.001). The Karlsson scoring scales evolved from 58.8 ± 16.5 to 88.4 ± 11.2 (p < 0.001). VAS scores significantly decreased from 2.9 ± 1.3 to 1.1 ± 1.0 (p < 0.001). On stress radiographs, TTA decreased from 15.1 ± 2.5 degrees to 5.8 ± 2.1 degrees (p < 0.001), whereas ATD reduced from 13.4 ± 2.9 mm to 5.7 ± 1.5 mm (p < 0.001). Patients' subjective satisfaction indicated 46 excellent, 20 good, 5 fair, and 2 bad results. Postoperatively, 15 cases (20.5%) did not achieve complete relief of discomfort or swelling, 9 cases (12.3%) experienced joint stiffness or decreased range of motion, and 6 cases (8.2%) had soft tissue irritation. Residual instability and reoperation are rare. Allograft rejection or wound infection was not observed.ConclusionFor the CLAI patients with poor remnant quality, anatomic reconstruction of the lateral ligaments using allograft tendon and suspensory fixation is an effective procedure, while the top three complications in incidence were residual discomfort, joint stiffness, and soft tissue irritation.Levels of evidenceLevel IV, retrospective case series.

Objective To compare the efficacy of arthroscopic anatomic reconstruction using autologous versus allogeneic tendons in restoration of ankle function following ligament injuries. Methods We conducted a retrospective cohort study and enrolled 210 consecutive patients with ankle ligament injuries treated between June 2021 and June 2024. Participants were allocated to autograft ( n  = 106) or allograft ( n  = 104) groups based on surgical selection. Propensity score matching (1:1) yielded 55 patients per group. We analyzed clinical data, six imaging parameters (Grades 0-III), and functional scores (AOFAS, Tegner, VAS, medial compartment displacement [Mcd], medial space difference [Msd]), examining their interrelationships. Generalized estimating equations (GEE) modeled functional score changes pre-/post-operatively. Results Both groups showed improved imaging grades and functional scores postoperatively. The autograft group achieved superior outcomes: medial/lateral collateral ligament grades recovered from mean grade III to 0 ( P  < 0.05 vs. allograft); AOFAS increased from 58.96 ± 7.34 to 90.71 ± 14.78( P  < 0.05). Significant intergroup differences persisted in collateral ligament grades and functional scores (all P  < 0.05).Pre- to postoperative changes in ligament grades significantly correlated with functional score improvements ( P  < 0.05). Improvements in imaging parameters strongly correlated with functional score enhancement rates ( P  < 0.05), particularly for anterior/posterior tibiotalar ligaments. GEE modeling demonstrated significantly greater functional gains in the autograft group: AOFAS (β = 1.656, P  < 0.001), Tegner (β = 1.172, P  = 0.005), and greater reductions in VAS (β = -2.532, P  < 0.001), Mcd (β = -2.288, P  < 0.001), and Msd (β = -1.957, P  < 0.001). Conclusion Arthroscopic autologous tendon reconstruction yields superior ligament integrity and functional recovery compared with allograft reconstruction.