Hallucination Rates and Reference Accuracy of ChatGPT and Bard for Systematic Reviews: Comparative Analysis.

BACKGROUND: Large language models (LLMs) have raised both interest and concern in the academic community. They offer the potential for automating literature search and synthesis for systematic reviews but raise concerns regarding their reliability, as the tendency to generate unsupported (hallucinated) content persist. OBJECTIVE: The aim of the study is to assess the performance of LLMs such as ChatGPT and Bard (subsequently rebranded Gemini) to produce references in the context of scientific writing. METHODS: The performance of ChatGPT and Bard in replicating the results of human-conducted systematic reviews was assessed. Using systematic reviews pertaining to shoulder rotator cuff pathology, these LLMs were tested by providing the same inclusion criteria and comparing the results with original systematic review references, serving as gold standards. The study used 3 key performance metrics: recall, precision, and F1-score, alongside the hallucination rate. Papers were considered "hallucinated" if any 2 of the following information were wrong: title, first author, or year of publication. RESULTS: In total, 11 systematic reviews across 4 fields yielded 33 prompts to LLMs (3 LLMs×11 reviews), with 471 references analyzed. Precision rates for GPT-3.5, GPT-4, and Bard were 9.4% (13/139), 13.4% (16/119), and 0% (0/104) respectively (P<.001). Recall rates were 11.9% (13/109) for GPT-3.5 and 13.7% (15/109) for GPT-4, with Bard failing to retrieve any relevant papers (P<.001). Hallucination rates stood at 39.6% (55/139) for GPT-3.5, 28.6% (34/119) for GPT-4, and 91.4% (95/104) for Bard (P<.001). Further analysis of nonhallucinated papers retrieved by GPT models revealed significant differences in identifying various criteria, such as randomized studies, participant criteria, and intervention criteria. The study also noted the geographical and open-access biases in the papers retrieved by the LLMs. CONCLUSIONS: Given their current performance, it is not recommended for LLMs to be deployed as the primary or exclusive tool for conducting systematic reviews. Any references generated by such models warrant thorough validation by researchers. The high occurrence of hallucinations in LLMs highlights the necessity for refining their training and functionality before confidently using them for rigorous academic purposes.

The Arthroscopic Trillat Procedure Is a Valuable and Durable Treatment Option for Recurrent Anterior Instability Associated With Massive Irreparable Cuff Tears.

PURPOSE: The purpose of the present study is to report the mid- and long-term clinical and radiologic outcomes of the arthroscopic Trillat for the treatment of recurrent anterior instability in patients with chronic massive irreparable rotator cuff tears (MIRCTs) and maintained active shoulder motion where reverse shoulder arthroplasty (RSA) is not indicated. METHODS: Twenty-one consecutive patients (mean age 61 years) were identified and retrospectively reviewed. All patients had recurrent anterior dislocations and conserved active forward elevation and active external rotation. The MIRCTs included a retracted (stage 3) supraspinatus tear in 14%, a supra- and infraspinatus tear in 76.5%, and a 3-tendon tear in 14%. A closed-wedge osteotomy of the coracoid was performed, and the coracoid was fixed above the subscapularis with a cannulated screw (10 cases) or suture buttons (11 cases). We followed patients with x-rays and computed tomography scan at 6 months, along with Subjective Shoulder Value, visual analog scale, Walch, Constant, and Rowe scores. The mean clinical and radiographic follow-up was 58 months (24-145 months). RESULTS: Overall, 96% (20/21) of the patients had a stable and functional shoulder and were satisfied with the procedure; no patient lost active shoulder motion. The Subjective Shoulder Value increased from 44% (10%-75%) to 94% (80%-100%), P < .001. The Constant and Rowe scores improved from 60 (25-81) to 81 (66-96) and from 54 (35 to 65) to 92 (70-100), respectively (P < .001). Among the 13 patients practicing sports before surgery, 10 (77%) went back to sports. At last follow-up, only 1 patient was revised to RSA. CONCLUSIONS: The arthroscopic Trillat procedure is a valuable and durable option for the treatment of recurrent anterior dislocations in older patients with chronic MIRCTs and conserved active shoulder motion. LEVEL OF EVIDENCE: Level IV, therapeutic case series.

The Arthroscopic Trillat Procedure Is a Valuable Treatment Option for Recurrent Anterior Instability in Young Athletes With Shoulder Hyperlaxity.

PURPOSE: The purpose of this study is to report the outcomes of the all-arthroscopic Trillat procedure, combined with capsular plication, for the treatment of recurrent anterior instability in young athletes with shoulder hyperlaxity (external rotation >90°). METHODS: We performed a retrospective evaluation of patients with recurrent anterior instability and shoulder hyperlaxity who underwent an arthroscopic Trillat between 2009 and 2019. Patients with concomitant rotator cuff lesions or voluntary or multidirectional instability were excluded. The osteotomized coracoid was fixed above the subscapularis with a cannulated screw or a suture button; a capsular plication was systematically associated. We followed patients with x-rays, computed tomography scans, and Subjective Shoulder Value, visual analog scale, Walch, Constant, and Rowe scores. Mean follow-up was 56 months (24-145). RESULTS: Twenty-eight consecutive patients (30 shoulders) with a mean age of 25 years were identified, and all met criteria. The main finding under arthroscopy was a "loose shoulder" with anteroinferior capsular redundancy and no or few (10%) labrum tears, glenoid erosion (13%), or Hill-Sachs lesions (10%). At last follow-up, 90% of the shoulders (27/30) were stable, and 79% (19/24) of the patients practicing sports returned to their preinjury activity level. The Walch-Duplay and Rowe scores improved from 54 (38-68) to 81 (4-100) and 55 (30-71) to 84 (45-100), respectively, P < .001. CONCLUSIONS: The arthroscopic Trillat is an effective procedure for the treatment of recurrent anterior instability in young athletes with shoulder hyperlaxity but no substantial humeral or glenoid bone loss, allowing return to overhead/contact sports. LEVEL OF EVIDENCE: Level IV, retrospective study.

The Bristow-Latarjet procedure for revision of failed arthroscopic Bankart: a retrospective case series of 59 consecutive patients.

BACKGROUND: Recurrence of anterior instability after arthroscopic Bankart prevents return to sports and remains a surgical challenge. We aim to assess clinical and radiologic outcomes after coracoid bone-block performed either open or under arthroscopy, for the management of failed arthroscopic Bankart PATIENTS AND METHODS: Fifty-nine consecutive patients with anterior instability recurrence after arthroscopic Bankart were revised with a Bristow or Latarjet procedure performed either open (25 cases) or under arthroscopy (34 cases). Patients were reviewed for clinical and radiologic examination at a minimum 2-year follow-up. Glenohumeral bony lesions were evaluated preoperatively with computed tomographic scans. Postoperative bone-block position, union, and postinstability arthritis were also evaluated. RESULTS: The mean follow-up was 89 months (24-193). The epidemiologic analysis showed that patients with failed arthroscopic Bankart were young (age <23 years), 58 (98%) were practicing sports, with contact/forced overhead sports (53%), often in competition (53%), had hyperlaxity (71%), and for the most part of them glenohumeral bone loss (88%). Their mean preoperative Instability Severity Index Score was 5.4 ± 2.2 points. After revision with Bristow-Latarjet procedure, 53 patients (91%) returned to sports, 37 (70%) to their previous sports activity, and 17 (46%) to their previous level. No patient suffered recurrent dislocation. Four patients (7%) had recurrent subluxations, all after open procedure; 8 patients (14.5%) had persistent anterior apprehension. A large and deep Hill-Sachs lesion was a risk factor for persistent anterior apprehension (P = .002) and lower level when returned to sports (P = .04). Ninety-two percent of bone-blocks were positioned flush with the glenoid anterior rim, with 84% of bone union. At last follow-up, 5% of patients had severe postinstability osteoarthritis (Samilson 4). CONCLUSION: The Bristow-Latarjet, performed either open or under arthroscopy, is an efficient procedure to restore shoulder stability and allow returning to sports in patients with failed arthroscopic Bankart and glenoid bone loss. Patients with a large and deep Hill-Sachs lesion had more persistent anterior apprehension and a lower sports level.

SECEC Grammont Award 2017: the prejudicial effect of greater tuberosity osteotomy or excision in reverse shoulder arthroplasty for fracture sequelae.

HYPOTHESIS: The aim was to evaluate risk factors for complications, revision, and mid- to long-term outcomes after reverse shoulder arthroplasty (RSA) implanted for proximal humeral fracture sequelae (PHFS). METHODS: The radiographs of 98 patients (mean age, 68 years) who underwent RSA for the treatment of PHFS were reviewed at a minimum 5-year follow-up. PHFS were divided into 4 types according to the Boileau classification: type 1 (46 cases), type 2 (6 cases), type 3 (12 cases), and type 4 (34 cases). The tuberosities underwent osteotomy in 28 cases and excision in 12 (all type 3 or 4 PHFS). The mean follow-up period was 8.4 years (range, 5-14 years). RESULTS: The functional results and rate of RSA survival without revision (85% vs. 100% at 10 years, P = .007) were significantly lower for types 3 and 4 vs. types 1 and 2. Overall, our findings showed that RSA for PHFS is not the panacea that surgeons once believed: At a mean follow-up of 8.5 years (range, 5-14 years), 59% of the patients in our series had fair or poor results. Patients who underwent tuberosity osteotomy or excision had lower functional results (adjusted Constant score, 69% vs. 88%; P < .001), more postoperative complications (32% vs. 9%, P = .003), and a higher revision rate (15% vs. 2%, P = .017). Patients who underwent tuberosity osteotomy or excision at the time of RSA were at risk of postoperative prosthetic instability and humeral stem loosening. The absence of the greater tuberosity at last radiographic follow-up was predictive of higher rates of complications and revisions, as well as a poorer final outcome. Previous fracture fixation was associated with a higher rate of complete tuberosity resorption (56% vs. 33%, P = .026) and with higher rates of postoperative complications (27% vs. 13%, P = .099) and reinterventions (17% vs. 2%, P = .018). CONCLUSION: The functional results and rates of complications and revision depend on the type of fracture sequelae and tuberosity management. Patients with more severe (type 3 and 4) fracture sequelae who undergo tuberosity osteotomy or excision are at risk of having a poorer functional result and higher rates of complications and revision with lower survival. Previous fracture fixation is also a prejudicial factor.

Clinical outcome and failure analysis of medial meniscus bucket-handle tear repair: a series of 96 patients with a minimum 2 year follow-up.

INTRODUCTION: The failure rate of meniscal repair remains significant, especially for bucket-handle tears. This study aimed to evaluate the clinical outcomes, failure rate and risk factors for failure of bucket-handle medial meniscal tear repairs performed during ACL reconstruction. MATERIALS AND METHODS: A retrospective analysis of prospectively collected data was performed on a consecutive series of 96 ACL reconstructions with meniscal arthroscopic suture of a bucket-handle tear of the medial meniscus with a minimum 2 year follow-up. Preoperative and postoperative evaluation at last follow-up included objective IKDC rating, instrumented differential laxity and Tegner activity level. Functional outcome was evaluated with Lysholm score at last follow-up. Failure rate, survival curves and risk factor analysis using Cox proportional hazard ratio models were performed to analyze suture repair failure. RESULTS: At IKDC rating, all patients were C or D preoperatively, whereas they where all A or B at last follow-up. Instrumented differential laxity improved from 6.77 mm (1.57) to 1.02 mm (1.15) mm at last follow-up (p = 1.9 E-18). The mean Tegner score before injury was 6.79 (± 1.47) and 6.11 (± 1.75) at last follow-up (p = 0.0011). Mean Lyholm score at last follow-up was 91.53 (± 11.6). The average entire cohort failure rate was 19% at final follow-up of 35.2 ± 9.8 months. Kaplan-Meier survival analysis demonstrated that the probability of the absence of failure decreased constantly over time. No significant difference in the objective IKDC, Lysholm or Tegner scores was observed between the failure group and the success group. Multivariate analysis revealed that younger patients and a procedure of ACL revision are more at risk for suture repair failure. In the majority of cases, the meniscal lesion observed at revision was equivalent or less extensive than the initial lesion. CONCLUSION: Despite the fact that failure rate remains high for medial meniscus bucket-handle tears, suture repair of bucket-handle tears should be encouraged taking into account the long-term consequences of menisectomy.

The reverse shoulder arthroplasty angle: a new measurement of glenoid inclination for reverse shoulder arthroplasty.

BACKGROUND: Avoiding superior inclination of the glenoid component in reverse shoulder arthroplasty (RSA) is crucial. We hypothesized that superior inclination was underestimated in RSA. Our purpose was to describe and assess a new measurement of inclination for the inferior portion of the glenoid (where the baseplate rests). METHODS: The study included 47 shoulders with rotator cuff tear arthropathy (mean age, 76 years). The reverse shoulder arthroplasty angle (RSA angle), defined as the angle between the inferior part of the glenoid fossa and the perpendicular to the floor of the supraspinatus, was compared with the global glenoid inclination (ß angle or total shoulder arthroplasty [TSA] angle). Measurements were made on plain anteroposterior radiographs and reformatted 2-dimensional (2D) computed tomography (CT) scans by 3 independent observers and compared with 3-dimensional (3D) software (Glenosys) measurements. RESULTS: The mean RSA angle was 25° ± 8° on plain radiographs, 20° ± 6° on reformatted 2D CT scans, and 21° ± 5° via 3D reconstruction software. The mean TSA angle was on average 10° ± 5° lower than the mean RSA angle (P < .001); this difference was observed regardless of the method of measurement (radiographs, 2D CT, or 3D CT) and type of glenoid erosion according to Favard. In Favard type E1 glenoids with central concentric erosion, the difference between the 2 angles was 12° ± 4° (P < .001). CONCLUSION: The same angle cannot be used to measure glenoid inclination in anatomic and reverse prostheses. The TSA (or ß) angle underestimates the superior orientation of the reverse baseplate in RSA. The RSA angle (20° ± 5°) needs to be corrected to achieve neutral inclination of the baseplate (RSA angle = 0°). Surgeons should be aware that E1 glenoids (with central erosion) are at risk for baseplate superior tilt if the RSA angle is not corrected.

Influence of Muscle Fatty Degeneration on Functional Outcomes After Endoscopic Gluteus Medius Repair.

PURPOSE: To report the early outcomes of endoscopic repair of tears of the gluteus medius tendon and to determine whether the fatty degeneration had an influence on clinical results. METHODS: Between October 2012 and June 2014, data were prospectively collected and retrospectively reviewed for all patients who underwent endoscopic gluteus medius repair. Patients were assessed pre- and postoperatively using the modified Harris hip score, the nonarthritic hip score, and visual analog scale for pain. The gluteus minimus and the 3 distinct parts of the gluteus medius (anterior, middle, and posterior) were assigned a grade of fatty degeneration on preoperative magnetic resonance imaging scans. RESULTS: Twenty-two hips (in 20 patients) were assessed with the mean follow-up of 31.7 months (range: 24 to 47 months). There were 15 partial-thickness and 7 full-thickness tears. No patient was lost to follow-up. The mean age at the time of surgery was 66 years (range: 45 to 82 years). Of the 20 magnetic resonance imaging-assessed hips included in the study, 14 had fatty degeneration of the gluteus medius (partial-thickness tears: n = 8, full-thickness tears: n = 6). The mean gluteus medius fatty degeneration index was 1.57 (range: 0.33 to 3.33). Postoperative improvement was seen in modified Harris hip score (33.7 points vs 80.2 points, P = .0001), nonarthritic hip score (47.7 points vs 76.8 points, P = .0001), and in the visual analog scale for pain (7.2 vs 3.2, P < .05). Increasing preoperative fatty degeneration index of the gluteus medius correlated with decreased postoperative functional hip score values (regression coefficient, 0.5839; P < .0001). Tear characteristics (partial or full-thickness) did not correlate with fatty degeneration or muscular atrophy and did not affect postoperative outcomes. CONCLUSIONS: Endoscopic surgical repair can be an effective treatment of gluteus medius tears in the short term. Fatty degeneration of the gluteus medius and minimus has a negative impact on clinical outcomes of endoscopic gluteus medius repair. LEVEL OF EVIDENCE: Level IV, therapeutic case series (no control group).

Intramedullary nailing for humeral shaft fractures: Is distal locking necessary?

INTRODUCTION: Intramedullary (IM) nailing of humeral shaft fractures is a reliable means to achieve bone union while allowing early motion. The hypothesis was that distal locking is unnecessary due to good primary stability of the impacted nail in the distal, truncated cone portion of the medullary canal. The primary objective of this study was to confirm the success of the procedure without distal locking by identifying failure criteria. The secondary objectives were to compare the outcomes of IM nailing with and without distal locking. MATERIAL AND METHODS: This was a retrospective, single-center, non-randomized study of 128 patients with a humeral shaft fracture between 2012 and 2020 treated surgically with a long IM nail. Proximal locking was done in every case, then the rotational stability of the nail was tested. Stable nails were not locked distally (group A), while unstable nails were locked distally through an anterior approach (group B). All patients were reviewed with at least 12 months' follow-up. RESULTS: Distal locking was performed in 30 patients (mean age 63, 17-91) while the fracture in 98 patients (mean age 65, 20-93) did not require distal locking. The average time to union was 4 months (2-6). The average operative time in group B was 87min (35-185) with 90s fluoroscopy time (33-158) versus 52min (20-127) with 44 s fluoroscopy time (12-143) in group A (p<0.05). Four patients in group B suffered postoperative radial nerve palsy and two others had another fracture at the level of the distal locking screws. The union rate did not differ between groups (Group A 94.6%, group B 86.2%, p=0.217) nor did the functional recovery - SSV of 79.5 (10-100) in group A versus 76 (40-100) in group B (p=0.271) - or the range of motion (p>0.05). There were no instances of rotational malunion. DISCUSSION: Except for certain distal third fractures, distal locking is not necessary to achieve bone union when the nail is impacted into the medullary canal. This reduces the operative time, fluoroscopy time and risk of neurological damage. LEVEL OF EVIDENCE: IV.

Femoroacetabular impingement treatment using the arthroscopic extracapsular outside-in approach: Does capsular suture affect functional outcome?

BACKGROUND: Over the last decades, the arthroscopic treatment of hip pathology has highly grown thanks to the evolution of surgical techniques and instrumentation development. An alternative approach consisting in making a first outside-in longitudinal capsulotomy was described by Laude at the end of the 2000s and is experiencing significant development in France. The clinical results of this technique have rarely been reported and in particular the influence of the repair of the capsule is unknown. Therefore we performed a retrospective case control study aiming to asses: (1) the clinical outcomes and complication rates of the outside-in extracapsular approach for the treatment of FemoroAcetabular Impingement (FAI) and (2) the effect of capsular closure on the functional outcome. HYPOTHESIS: We hypothesize that the outside-in extracapsular approach is a safe and efficient technique and the capsular closure at the end of the procedure positively affects the functional outcome. METHODS: A retrospective study was conducted on prospectively collected data of a consecutive series of hip arthroscopies performed for surgical treatment of FAI using the outside-in extracapsular approach. Any complications during follow-up were identified and recorded. Linear regression models were used to estimate the influence of capsular closure on the functional outcome. Functional outcome was assessed using modified Harris Hip Score (mHHS) and Non-arthritic Hip Score (NAHS). RESULTS: Sixty-four hips in 57 patients operated by a single surgeon between October 2013 and December 2016 were analyzed at the time of final follow-up of 34.17 months (range 24 to 53). As the surgical technique evolved over time, a side-to-side capsular closure was performed at the end of the procedure for 25 hips and the capsule was left open for the remaining 39 patients. Functional outcome measurements showed an improvement from the preoperative to the last follow-up: 63.5±11.0 to 88.1±11.2 for mHHS, 63.1±13.8 to 86.4±13.4 for NAHS. Capsular closure leads to a significantly improved clinical outcome: gain in mHHS: 25.8±2.3 vs. 20.6±1.9 (p≤0.044), gain in NAHS: 26.1±2.5 vs. 19.6±2.1, (p=0.023). No major complications occurred. One case of postoperative tensor fascia latae atrophy was documented in the group "capsule left open". CONCLUSION: Hip arthroscopy in the management of FAI with an extraarticular starting point (outside-in) is a safe technique with functional results and postoperative morbidity comparable to previously reported techniques. Side-to-side capsular closure at the end of the procedure might positively affect the final functional outcome. LEVELS OF EVIDENCE: III, case control retrospective study.

The "Auto-Constant": Can we estimate the Constant-Murley score with a self-administered questionnaire? A pilot study.

INTRODUCTION: The Constant score, allows an objective and subjective assessment of the shoulder function. It has been proven to have a poor interobserver reliability for some of its aspects and is not usable as a remote assessment tool. HYPOTHESIS: The Constant-Murley functional shoulder score can be assessed with a self-administered questionnaire. METHODS: We conducted a prospective continuous study in a shoulder-specialized service. For each patient seen in consultation or hospitalized for a shoulder pathology, a self-administered questionnaire was delivered, and a clinical examination was performed by a surgeon. The questionnaire, in French language, was composed of checkboxes only, with pictures preferred over text for most items. Correlations with surgeon examination were assessed with the intraclass correlation coefficients, differences with the paired t-test. RESULTS: One hundred consecutive patients were analyzed. Correlation between the two scores was excellent (0.87), as were the range of motion and the pain subscores (0.85 and 0.78), good for the activity (0.69) and fair for the strength (0.57). The mean total score was 3 points lower for the self-administered questionnaire (CI95 [-5; -1]; p<0.01). Activity and pain were not significantly different (-0.4/20 and -0.3/40; p>0.05) but pain and force were slightly different (+0.8/15; -3.0/25; p<0.01). CONCLUSION: The Auto-Constant questionnaire in French is an excellent estimator of the Constant score, and of its pain and mobility sub-scores. It is less accurate for the evaluation of the strength, but differences between sub-scores compensate and allow its use in daily practice. LEVEL OF PROOF: II, Prospective continuous clinical series.

Arthroscopic Identification and Management of Recurrent Iliopsoas Impingement After Total Hip Arthroplasty.

Arthroscopic release of the iliopsoas tendon for iliopsoas impingement (IPI) after total hip arthroplasty (THA) at the lesser trochanter gives good results. However, where IPI then recurs, due to adhesions between the healing iliopsoas tendon and the surrounding soft tissue, and nonoperative measures have failed, a revision THA procedure is usually considered. We propose a technique of arthroscopic visualization of the recurrent IPI and a subsequent psoas tenotomy at the level of the hip joint using an outside-in capsulotomy approach. This secondary tenotomy, located proximally directly at the level of the recurrent impingement, allows relief of the painful symptoms without compromising the muscle function of the iliopsoas and precludes the need for a complex THA revision.

Arthroscopic All-Inside Repair of Medial Meniscus Grade 2 Horizontal Cleavage Tear Using Additional Posteromedial Portal.

Management of intrasubstance horizontal cleavage meniscal lesions of microtraumatic origin remains poorly defined in young patients. For grade 2 lesions resistant to conservative measures, the standard technique is debridement of the intrasubstance tear and open suture repair via a posteromedial approach. The objective of this Technical Note is to propose an arthroscopic alternative to this open technique, using an arthroscopic additional posteromedial portal. This technique facilitates an approach to the lesion via its peripheral portion without creating an iatrogenic lesion of the free edge of the meniscus, which is located in the white zone and thus exhibits limited vascularity.

All-Inside Bicruciate Ligament Reconstruction Technique: A Focus on Graft Tensioning Sequence.

Bicruciate ligament (BCL) reconstructions are challenging procedures. One of the main operative goals is to stabilize the knee in the correct anterior-posterior position. We present an all-inside arthroscopic BCL reconstruction technique using hamstring tendon grafts. Ipsilateral semitendinosus (ST) and gracilis tendons are used for TriLink (Arthrex, Naples, FL) double-bundle posterior cruciate ligament (PCL) reconstruction and contralateral ST tendon is used for GraftLink (Arthrex) single-bundle anterior cruciate ligament (ACL) reconstruction. The use of instruments for retrograde reaming and devices for adjustable cortical suspensory fixation allows for a safe, reproducible all-inside BCL reconstruction by simplifying these difficult steps. To minimize the risk of anterior-posterior malposition, the ACL graft is first tensioned with the knee in full extension, ensuring a neutral anteroposterior positioning of the tibia under the femur. The PCL anterolateral bundle can then be independently tensioned with the knee at 90° of flexion, and the posteromedial bundle at 30° of flexion, while applying an anterior translation to the tibia to reduce the posterior drawer without any risk of overcorrection. The purpose of this Technical Note was to describe an all-inside BCL reconstruction with a specific focus on the graft tensioning sequence.

Reoperation Rates After Combined Anterior Cruciate Ligament and Anterolateral Ligament Reconstruction: A Series of 548 Patients From the SANTI Study Group With a Minimum Follow-up of 2 Years.

BACKGROUND: Early clinical results of anterolateral ligament (ALL) reconstruction are promising, but concerns exist due to high rates of complications after other types of lateral extra-articular tenodesis. The rate of surgery after combined anterior cruciate ligament (ACL) and ALL reconstruction is not known. PURPOSE: To determine the rate of reoperation after combined ACL and ALL reconstruction. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: A retrospective analysis of prospectively collected data from the Scientific ACL Network International (SANTI) Study Group database was performed to include all patients who had undergone combined ACL and ALL reconstruction between January 2012 and June 2014. At the end of the study period, all patients were contacted by telephone, and the operative notes of those who stated that they had undergone reoperation were reviewed to determine the type and rates of the subsequent procedures performed. Descriptive data were analyzed for the entire patient cohort. RESULTS: The study population comprised 548 quadruple hamstring graft (4HT)+ALL reconstructions. The mean age (±SD) was 24.3 ± 7.9 years (range, 11.9-55.7 years), and 70.3% of subjects were male. The mean duration of follow-up was 35.5 ± 8.0 months (range, 24-54 months). Seventy-two patients (13.1%) underwent ipsilateral reoperation. This comprised a total of 77 procedures. Graft revision occurred in 14 knees (2.6%) at a mean of 18.3 months (±7.4 months) after the index procedure. There were 63 reoperations for ipsilateral, non-graft rupture-related indications (meniscus, n = 30; arthrofibrosis, n = 22; removal of hardware, n = 4; deep infection, n = 3; arthroscopic lavage without infection, n = 4). The only specific complications related to the ALL procedure (n = 3) were all related to femoral hardware that required removal. In both univariate and multivariate analyses, only the presence of a medial meniscal lesion at the index procedure was significantly associated with ipsilateral reoperation (odds ratio, 2.58; 95% CI, 1.43-4.76; P = .002). CONCLUSION: The reoperation rate after combined ACL and ALL reconstruction in this series is broadly comparable to the reoperation rate after isolated ACL reconstruction as reported in previous studies. In addition, the high rates of knee stiffness and reoperation reported in historical series of nonanatomic, lateral extra-articular tenodesis were not observed in the current series.