Return to Sport After Nonoperative Management of Elbow Ulnar Collateral Ligament Injuries: A Systematic Review and Meta-analysis

Return to Sport After Ulnar Collateral Ligament Tears Treated with Platelet-Rich Plasma Injections is Influenced by Length of Rehabilitation and Leukocyte Content of Injections: A Systematic Review

PURPOSE

To analyze the current literature assessing return to sport (RTS) outcomes after platelet-rich plasma (PRP) injections for the nonoperative treatment of ulnar collateral ligament (UCL) injuries.

METHODS

A systematic review of PubMed, Embase, and Web of Science databases was conducted in June 2023 to identify studies assessing RTS after PRP injections for UCL injuries. Tear severity, leukocyte content of PRP, rehabilitation protocol, and RTS outcomes were collected. Heterogeneity was assessed through proportional random-effects models for RTS and return to preinjury level of play (RTLP) with subgroup analysis by rehabilitation length, leukocyte content of PRP, and tear severity.

RESULTS

Eight studies with 278 partial-thickness and 44 full-thickness tears were identified. The mean age of patients ranged from 17.3 to 26 years. The mean RTS time after injection ranged from 5.2 to 25.4 weeks. High heterogeneity was observed among studies, with RTS rates ranging from 46% to 100% (I2 = 83%) and RTLP rates ranging from 34% to 100% (I2 = 83%). Studies with the longest rehabilitation programs (12-14 weeks) had RTS rates of 87% to 100% (I2 = 0%). RTS rates among athletes treated with leukocyte-poor and leukocyte-rich PRP ranged from 73% to 100% (I2 = 30%) and 52% to 88% (I2 = 84%), respectively. Subanalysis of RTS by tear severity demonstrated high variability, with partial-thickness rates ranging from 59% to 100% (I2 = 55%) and full-thickness rates ranging from 27% to 100% (I2 = 63.2%).

CONCLUSIONS

Studies assessing RTS after PRP injections are highly heterogeneous; however, current data suggest nonoperative RTS and RTLP rates ranging from 46% to 100% and 34% to 100%, respectively. Studies with at least 12 weeks of rehabilitation and studies using leukocyte-poor PRP demonstrated low heterogeneity and greater RTS rates. Alternatively, high heterogeneity was observed among both partial- and full-thickness tears.

LEVEL OF EVIDENCE

Level IV, systematic review of Level III-IV studies.

Clinical Outcomes of Ulnar Collateral Ligament Repair With Internal Brace Versus Ulnar Collateral Ligament Reconstruction in Competitive Athletes

BACKGROUND

The increasing prevalence of ulnar collateral ligament (UCL) injuries, particularly in young athletes, necessitates optimization of treatment options. The introduction of UCL repair with internal bracing offers an exciting alternative to traditional UCL reconstruction.

PURPOSE

To compare midterm outcomes between UCL repair with internal bracing and UCL reconstruction in competitive athletes.

STUDY DESIGN

Cohort study; Level of evidence, 3.

METHODS

The authors identified competitive athletes who underwent primary UCL repair with internal bracing or UCL reconstruction between 2013 and 2021 and were at least 2 years postsurgery. To have qualified for repair, patients must have shown complete or partial UCL avulsion from the sublime tubercle or medial epicondyle. Relevant patient, injury, operative, and revision surgery data were collected via chart review. Preoperative American Shoulder and Elbow Surgeons Elbow assessment form (ASES-E), Kerlan-Jobe Orthopaedic Clinic Shoulder and Elbow (KJOC), and Andrews-Carson scores were obtained from an ongoing data repository. ASES-E, KJOC, and Andrews-Carson scores, and return-to-sport (RTS) data were collected at follow-up. Linear regression modeling controlling for relevant covariates was utilized to compare patient-reported outcome (PRO) scores between groups. Proportions of athletes who successfully returned to sport and proportions of subsequent revision procedures between groups were compared using chi-square tests. Lastly, for those with baseline questionnaire data, the authors compared magnitude of change between preoperative and postoperative scores between groups using linear regression modeling with baseline scores and follow-up time as the covariates, and follow-up scores as the dependent variable.

RESULTS

A total of 461 athletes were eligible for inclusion with complete clinical and outcome data available (mean age at surgery, 19.1 years; 92% male). The UCL repair group had a significantly shorter follow-up time than the UCL reconstruction group (4.4 vs 6.3 years; P < .01). When controlling for follow-up time, the groups did not differ in ASES-E, KJOC, or Andrews-Carson scores at follow-up. There was no significant difference in proportion of revisions between UCL repair (9%) and UCL reconstruction (8%) (P = .77). Of the 268 athletes with complete follow-up in the repair group, 247 attempted to return to their preinjury sport, and 241 (98%) were able to RTS. Six athletes reported that they were unable to RTS due to limitations from their surgery. Of the 155 athletes with follow-up in the reconstruction group, 147 attempted to return to their preinjury sport; 145 (99%) were able to successfully RTS, and 2 were unable to return due to limitations from their surgery. The 2 groups, repair with internal brace versus reconstruction, did not statistically differ in the proportions that returned to preinjury sport (P = .20) but did differ regarding time in months to return to practice (6.7 ± 3.5 vs 10.2 ± 11.7) (P < .01) and time in months to return to competition (9.2 ± 4.6 vs 13.4 ± 13.3) (P < .01).

CONCLUSION

Athletes who underwent UCL repair with internal brace reported excellent midterm PROs statistically similar to those after UCL reconstruction, including proportion successfully returning to preinjury sport. There was no significant difference in revision rates between procedures. However, athletes who underwent UCL repair had a statistically significantly shorter time to RTS.

Ulnar Collateral Ligament Injuries in Overhead Athletes: Diagnosis, Management, and Clinical Outcomes

Ulnar collateral ligament (UCL) injuries are a common source of pain and disability in overhead and throwing athletes. The prolonged nature of healing often results in notable time lost from competitive sports regardless of the definitive management strategy. A thorough history and physical examination are critical in the diagnosis of UCL injury and understanding patient goals and expectations. In carefully selected patients, nonsurgical management, including rest and slow progression back to activities, can result in successful return to sport. Recent literature has suggested that administration of platelet-rich plasma may be effective in aiding in the healing process, particularly in proximal and partial-thickness tears; however, additional study is warranted. UCL reconstruction has been the benchmark for tears not amendable to nonsurgical treatment, with flexor-pronator complex preservation being important. UCL repair has historically been most commonly used in partial avulsions, but indications have yet to be completely well defined. Knowledge regarding appropriate UCL treatment continues to evolve with patient-specific treatment being essential.

Early Surgery for Partial Tears of the Ulnar Collateral Ligament May Be More Cost-Effective and Result in Longer Playing Careers Than Nonoperative Management for High-Level Baseball Pitchers: A Decision-Analytic Markov Model-Based Analysis

BACKGROUND

Nonoperative management versus early reconstruction for partial tears of the medial ulnar collateral ligament (MUCL) remains controversial, with the most common treatment options for partial tears consisting of rest, rehabilitation, platelet-rich plasma (PRP), and/or surgical intervention. However, whether the improved outcomes reported for treatments such as MUCL reconstruction (UCLR) or nonoperative management with a series of PRP injections justifies their increased upfront costs remains unknown.

PURPOSE

To compare the cost-effectiveness of an initial trial of physical therapy alone, an initial trial of physical therapy plus a series of PRP injections, and early UCLR to determine the preferred cost-effective treatment strategy for young, high-level baseball pitchers with partial tears of the MUCL and with aspirations to continue play at the next level (ie, collegiate and/or professional).

STUDY DESIGN

Economic and decision analysis; Level of evidence, 2.

METHODS

A Markov chain Monte Carlo probabilistic model was developed to evaluate the outcomes and costs of 1000 young, high-level, simulated pitchers undergoing nonoperative management with and without PRP versus early UCLR for partial MUCL tears. Utility values, return to play rates, and transition probabilities were derived from the published literature. Costs were determined based on the typical patient undergoing each treatment strategy at the authors' institution. Outcome measures included costs, acquired playing years (PYs), and the incremental cost-effectiveness ratio (ICER).

RESULTS

The mean total costs resulting from nonoperative management without PRP, nonoperative management with PRP, and early UCLR were $22,520, $24,800, and $43,992, respectively. On average, early UCLR produced an additional 4.0 PYs over the 10-year time horizon relative to nonoperative management, resulting in an ICER of $5395/PY, which falls well below the $50,000 willingness-to-pay threshold. Overall, early UCLR was determined to be the preferred cost-effective strategy in 77.5% of pitchers included in the microsimulation model, with nonoperative management with PRP determined to be the preferred strategy in 15% of pitchers and nonoperative management alone in 7.5% of pitchers.

CONCLUSION

Despite increased upfront costs, UCLR is a more cost-effective treatment option for partial tears of the MUCL than an initial trial of nonoperative management for most high-level baseball pitchers.

Avulsion and Soft Tissue Injuries of the Ulnar Collateral Ligament in Children and Adolescents

BACKGROUND

Although pediatric medial epicondylar fractures and apophysitis are well studied, patterns of subapophyseal avulsion and ligamentous injuries of the medial elbow in this population merit investigation to inform optimal treatment strategies.

PURPOSE

To describe the occurrence and demographic correlates of ulnar collateral ligament (UCL) avulsion and soft tissue injuries of the pediatric and adolescent elbow.

STUDY DESIGN

Cross-sectional study; Level of evidence, 3.

METHODS

An institutional review board-approved review was conducted to identify consecutive patients with medial elbow injuries treated in a tertiary pediatric sports medicine practice between 2016 and 2021. Radiographs were obtained during injury evaluation, and patients with nondisplaced medial epicondylar apophysitis and complete epicondylar fracture were excluded, resulting in 150 patients with soft tissue injuries occurring distal to the medial epicondyle apophysis (subapophyseal) for study. Radiographs were evaluated for bony avulsion of the UCL from either the medial epicondyle proximally or the ulnar sublime tubercle distally. Injuries without radiographic evidence of bony avulsion, but with clinical examination findings consistent with ligamentous injury, were classified as radiographically negative UCL injuries, and magnetic resonance imaging (MRI) was performed to further evaluate these injuries if moderate to severe medial swelling of the elbow or significant concern for medial structural injury was present on examination. These MRI scans were evaluated to classify the UCL injury and assess for periosteal or cartilaginous avulsions.

RESULTS

A total of 150 patients (mean age, 12.5 ± 3.4 years; 70 female), 55% (150/274) of the entire medial elbow injury population, had a subapophyseal injury. Of these patients, 62 had a bony avulsion detected on radiograph, and 88 had a radiographically negative injury. In addition to the 62 radiographic avulsions, the 61 MRI scans obtained on those radiographically negative injuries revealed 33 complete UCL disruptions, resulting in 63.3% (95/150) of patients sustaining a complete ligamentous disruption. With the MRI scans, 37 (61%) cases of cartilaginous or periosteal avulsion of the UCL were diagnosed. Overall, 66% of all 150 subapophyseal injuries had a bony, cartilaginous, or periosteal UCL avulsion. Patients with cartilaginous (mean age, 10.3 years) and bony (mean age, 10.6 years) avulsions were younger than those with central ligament injury (mean age, 14.2 years) or periosteal (mean age, 14.2 years) avulsions (P = .005). There was a significant association between the mechanism of injury and the location of UCL tear identified on MRI scans: traumatic falls were associated with distal tears, and throwing injuries were associated with proximal tears (P < .001).

CONCLUSION

UCL central ligament and avulsion lesions may be frequently diagnosed after injury to the pediatric medial elbow, the majority of which are complete injuries, and may require MRI for diagnosis. The mechanism of injury may predict the location of ligamentous injury, and osteocartilaginous avulsions are more likely to present at younger ages than injuries to the soft tissue of the UCL or periosteum. The prevalence of these injuries merits further investigation into best protocols of nonoperative treatment or surgical repair techniques and outcomes.

A systematic review of the outcomes of partial ulnar collateral ligament tears of the elbow in athletes treated non-operatively with platelet-rich plasma injection

Background

This study aimed to analyze the effects of platelet-rich plasma (PRP) for partial ulnar collateral ligament (UCL) tears in athletes and predicted positive outcomes.

Methods

The researchers systematically reviewed the PubMed, Cochrane CENTRAL, MEDLINE, Scopus, and Google Scholar databases to identify studies with clinical outcomes of PRP for partial UCL tears. They excluded studies that did not stratify data by tear type or included surgical management.

Results

Five studies with 156 patients were included. The timing, amount, platelet concentration, type, and number of PRP injections were highly variable among the studies. However, 75% (n = 97/127) of athletes returned to sport (RTS) at a weighted average of 82.1 days (37-84) after PRP injection. One study showed significant improvements in patient-reported outcomes. Two studies showed positive outcomes in the modified Conway scale, complete reconstitution of the UCL in 87% of patients on MRI, and significant improvement in the humeral-ulnar joint space after PRP injection via ultrasound. The Coleman methodology score (CMS) averaged 48/100, indicating an overall poor quality of evidence.

Conclusion

This review demonstrates favorable RTS, clinical, and radiographic outcomes in patients receiving PRP for partial UCL tears, but the literature remains heterogeneous and of low quality.

Level of Evidence

III.

High variability among surgeons in evaluation, treatment, and rehabilitation of medial ulnar collateral ligament injuries

Hypothesis and/or Background

The incidence of elbow medial ulnar collateral ligament (MUCL) injuries has been increasing, leading to advances in surgical treatments. However, it is not clear that there is consensus among surgeons regarding diagnostic imaging, the indications for acute surgery and postoperative rehabilitation. The purpose of this study is evaluate surgeon variability in the presurgical, surgical, and postsurgical treatment of MUCL injuries regarding the imaging modalities used for diagnosis, indications for acute surgical treatment, and postoperative treatment recommendations for rehabilitation and return to play (RTP). Our hypothesis is that indications for acute surgical treatment will be highly variable based on MUCL tear patterns and that agreement on the time to RTP will be consistent for throwing athletes and inconsistent for nonthrowing athletes.

Methods

A survey developed by 6 orthopedic surgeons with expertise in throwing athlete elbow injuries was distributed to 31 orthopedic surgeons who routinely treat MUCL injuries. The survey evaluated diagnostic and treatment topics related to MUCL injuries, and responses reaching 75% agreement were considered as high-level agreement.

Results

Twenty-four surgeons responded to the survey, resulting in a 77% response rate. There is 75% or better agreement among surveyed surgeons regarding acute surgical treatment for distal full thickness tears, ulnar nerve transposition in symptomatic patients or with ulnar nerve subluxation, postoperative splinting for 1-2 weeks with initiation of rehabilitation within 2 weeks, the use of bracing after surgery and the initiation of a throwing program at 3 months after MUCL repair with internal brace by surgeons performing 20 or more MUCL surgeries per year. There were a considerable number of survey topics without high-level agreement, particularly regarding the indications for acute surgical treatment, the time to return to throwing and time RTP in both throwing and nonthrowing athletes.

Discussion and/or Conclusion

The study reveals that there is agreement for the indication of acute surgical treatment of distal MUCL tears, duration of bracing after surgery, and the time to initiate physical therapy after surgery. There is not clear agreement on indications for surgical treatment for every MUCL tear pattern, RTP time for throwing, hitting and participation in nonthrowing sports.