Benefits of Meniscal Repair in Selected Patients Aged 60 Years and Older

Abstract

Background:

Little is known about the benefits and outcomes of meniscal repair in patients older than 60 years.

Purpose:

To (1) report the clinical and radiographic outcomes of meniscal repair in patients aged ≥60 years and compare them with matched patients who underwent meniscectomy and (2) identify procedural failures.

Study Design:

Cohort study; Level of evidence, 2.

Methods:

We included 32 knees in 32 patients aged ≥60 years (20 female, 12 male; mean age, 64.5 ± 4.6 years) who underwent meniscal repair surgery at a single medical institution between 2010 and 2020. Patients were matched according to age, sex, body mass index, and meniscal tear type with a comparison cohort who underwent meniscectomy (n = 49 patients [49 knees]; 32 female, 17 male). For all patients, demographic information, clinical history, physical examination findings, treatment details, and radiographic images were reviewed and analyzed. At final follow-up (mean, 42.2 months; range, 13-128 months), patients completed the 2000 International Knee Documentation Committee (IKDC) Subjective Knee Evaluation Form, Knee injury and Osteoarthritis Outcome Score (KOOS), and Lysholm score. Clinical failure was defined as revision surgery and/or progression to total knee arthroplasty (TKA). A matched-pairs t test was used to analyze differences between the 2 treatment groups, and Kaplan-Meier analysis was used to determine the rates of knee osteoarthritis and progression to TKA.

Results:

The majority of patients had a medial meniscal tear (72.8%), whereas the lateral meniscus was torn in 27.2% of cases. Most tears were located in the meniscal root (56.8%), followed by the posterior horn (34.6%) and midbody (8.6%). At final follow-up, all outcome scores were higher in the repair group compared with the meniscectomy group (IKDC, 78.9 ± 13.4 vs 56.0 ± 15.4; KOOS, 86.6 ± 11.9 vs 61.7 ± 16.2; Lysholm, 88.3 ± 13.3 vs 68.7 ± 15.2, respectively; P < .001 for all). Clinical failure was observed in 22% of patients in the repair group.

Conclusion:

All clinical outcome scores were higher in the meniscal repair group compared with the matched meniscectomy group at final follow-up. The clinical failure rate of the repair group was 22%. These findings support meniscal repair in selected patients aged ≥60 years.

The menisci of the knee are crucial for maintaining the biological and biomechanical integrity of the joint. They absorb and transmit compressive loads, estimated to amount to 50% of the load carried during walking and 70% to 99% during other compressive moments. ^33,35 Correlating with the high relevance of the meniscal structure to joint homeostasis, meniscal surgery is the most common type of orthopaedic surgery performed in the United States, with more than 500,000 meniscal tears treated annually. ¹³

Isolated meniscal tears are increasingly recognized as a cause of knee pain and early onset of knee osteoarthritis in young patients and are often addressed with surgical repair. ¹² The success rates for meniscal repairs in the adult and athletic population have been well-documented and are generally favorable. ^28,31 In older patients, however, surgeons were historically reluctant to repair these lesions because of concerns about healing potential or the presence of preexisting degenerative changes. ⁴ A proposed limiting factor of the success of the procedure is the sparse vasculature of the meniscus and therefore its limited healing potential. ² In the course of aging, blood supply to the meniscus decreases even further, and degenerative changes in the knee joint increase. ³² Because of this biological degradation, meniscal repairs in older patients might be associated with higher failure rates, which have been documented in multiple studies. ^3,30

Given these concerns, partial meniscectomy and nonoperative measures have traditionally been first-line treatment for older (usually >40 years) patients with meniscal pathology. However, because the average life expectancy continues to increase, and several studies revealed that total and partial meniscectomy significantly altered tibiofemoral biomechanics leading to deleterious effects on the knee, meniscal repair has gained popularity. ^6,11,20,10 Meniscal repair has become the preferred technique when indicated because of its ability to preserve knee biomechanics and prevent or delay the progression of chondral degeneration associated with meniscal pathology. ^16,22 Due to inherent benefits of meniscal repair and the notable downside to meniscectomy, there has been a significant increase in the number of meniscal repairs in relation to meniscectomies in the United States for all age groups. ¹

Although the definition of “older patients” is usually ≥40 years, outcome data for meniscal repair surgery on patients aged ≥60 years are limited. ¹⁰ Studies describing patient-reported outcome measures (PROMs) in particular are scarce, despite their value as a metric of patient satisfaction and quality of life after a surgical intervention. To our knowledge, no data are readily available regarding outcomes of meniscal repair in a population aged ≥60 years. Therefore, the purpose was to (1) report the clinical and radiographic outcomes of meniscal repair procedures in this population and compare them with matched patients who were treated with meniscectomy and (2) identify procedural failures.

Methods

Study Population and Design

The study protocol was approved by our institutional review board. The study was retrospective in nature. We reviewed the records of all patients aged ≥60 years who underwent arthroscopic meniscal repair and meniscectomy at our institution between November 2010 and January 2020. Procedures were identified based on Current Procedural Terminology codes 29880, 29881, 29882, and 29883. The former 2 codes comprised the meniscectomy cohort, and the latter 2 comprised the meniscal repair cohort.

A total of 74 repaired meniscal tears in 64 patients were identified. A total of 36 consecutive isolated meniscal repairs (in 36 patients) remained after we applied exclusion criteria, which were concomitant anterior cruciate ligament tear and reconstruction, grade 2 or 3 posterior cruciate ligament (PCL) injury, medial collateral or lateral collateral ligament injury, full-thickness (grade 4) osteochondral lesion (as determined at the time of arthroscopy), periarticular fracture, combination injuries of both menisci in the same knee, and <1 year of follow-up. PROMs (2000 International Knee Documentation Committee [IKDC] Subjective Knee Evaluation Form, Knee injury and Osteoarthritis Outcome Score [KOOS], and Lysholm score) were exclusively collected for this study during routine visits to the clinic or by telephone interview at the time of final follow-up. Despite attempts to contact all patients, 4 patients did not have clinical follow-up (14%). Therefore, the repair group consisted of 32 meniscal repairs that were performed by 4 different surgeons in 32 patients, who were evaluated for at least 1 year or until known failure (Figure 1).

Figure 1.

Flowchart showing patient movement through the study for (A) the repair group and (B) the meniscectomy group. ACL, anterior cruciate ligament; PCL, posterior cruciate ligament.

The same exclusion criteria were applied to patients treated with partial meniscectomy (meniscectomy group). A total of 160 patients aged ≥60 years who underwent consecutive partial meniscectomy were identified. After exclusion criteria were applied, 121 patients with at least 1 year of follow-up remained. After matching to the patients in the repair group was performed based on age (±2.5 years), sex (male or female), body mass index (BMI) (±2.5 kg/m²), location of lesion (medial meniscus or lateral meniscus), and zone of lesion (body, posterior horn, or root), 49 meniscectomy patients remained and were included in the study. All patients in the meniscectomy group completed the same PROMs as those in the repair group. Meniscal repairs were matched in a 1:2 ratio where possible by a blinded statistician.

Surgical Indications

Our criteria for meniscal repair were the ability to technically stabilize and coaptate an unstable, full-thickness tear >1 cm in length and within 6 mm of the meniscosynovial junction. Indications for partial meniscectomy included but were not limited to degenerated, macerated tears and tears that could not be technically stabilized. The final decision regarding treatment type was at the discretion of the surgeon and was based on a patient’s chronological age, biological age, general health, comorbidities, athletic ambition, and preference. Contraindications for meniscal repair included stable tears <10 mm in length, partial-thickness tears (<50%), and radial tears (<3 mm). Patients were assessed, and all surgeries were performed, at a single institution. Treatment decisions were made by the surgeon, taking into account tear type and location, overall status of the knee, patient age and activity level, and patient preference.

The majority of repaired tears in our study cohort represented injuries of the meniscus root, which constitutes a special subsection of meniscal tears. They are generally classified into 2 clinical categories: (1) traumatic tears, which typically occur in younger patients and are often lateral and associated with concomitant ligamentous injury; and (2) degenerative tears, which are often found in older patients, affect the medial meniscus, and result from chronic, often low-energy attritional mechanisms. ²⁶ Risk factors for posterior root tears are well-documented and include varus malalignment, older age, increased BMI, female sex, and increased Kellgren-Lawrence (K-L) grade. ¹⁹

Root tears result in total loss of meniscal function and have a biomechanical effect similar to a total meniscectomy if left untreated. Therefore, thorough understanding of diagnostic and therapeutic details is important to achieve the best possible clinical outcomes. In pursuit of this, the surgeon must discriminate between injuries that are approachable with a repair procedure and injuries that are best treated nonoperatively or with meniscectomy. Magnetic resonance imaging (MRI) has been considered the gold standard in preoperative diagnosis of meniscus root tears. MRI is used to assess 5 findings, crucial for diagnosis and treatment decision, which can best be analyzed using T2-weighted sequences: (1) meniscal extrusion; (2) missing meniscus near the PCL (commonly known as ghost sign); (3) a gap in the meniscus root, termed cleft sign; (4) a linear signal found at the fracture site, and (5) a bone marrow edema found due to contusion under the tear. ¹⁷

Meniscal extrusion is defined as a substantial (≥3 mm for medial tears) outward radial displacement of the meniscus from the tibial articular cartilage and has been reported to be strongly associated with meniscus root pathology and joint degeneration. ²⁷ MRI evaluation of the meniscus roots must be viewed in light of certain limitations and should always be augmented by physical examination and patient history. ⁷ Krych et al ²⁶ demonstrated that the rate of preoperatively identified posterior root tears on MRI scans read by fellowship-trained musculoskeletal radiologists was only 33%, with only 50% of missed tears clearly evident when retrospectively reviewing known tears.

In the presence of mechanical symptoms, such as catching or locking, nonoperative treatment of root tears is not advised. Contraindications for meniscus root repair include subchondral bone collapse, substantial malalignment (≥5°), unaddressed instability of the knee joint, chondral defects (grade ≥3; >2 cm²), and notable degenerative pathology of the affected knee (K-L grade >2). In addition, increased BMI (ie, >30 kg/m²) and milder forms of malalignment (<5°) serve as relative contraindications given the increased stress of the repair construct. ⁵ In these cases, meniscectomy poses a viable treatment option in order to eliminate mechanical symptoms. Clinical outcome, however, is not significantly improved by meniscectomy. Krych ²⁴ demonstrated that patients undergoing partial meniscectomy for symptomatic medial meniscus posterior root tears demonstrated no substantial benefit in PROMs, and furthermore, 52% of meniscectomy patients progressed to arthroplasty at a mean of 4.5 years.

Surgical Technique

Medial or lateral meniscal tears were repaired using a routine arthroscopic setup for diagnostic purposes. Standard arthroscopic portals were used, and all tears underwent preparation, including rasping and anatomic reduction before fixation. The majority of meniscal repairs were performed in the setting of a root tear (n = 15; 52%) using a previously described transtibial suture technique. ^18,40 All repairs were performed with the patient in the supine position. Standard anterolateral and anteromedial portals were established adjacent to the patellar tendon and proximal to the meniscus to allow for instrument passage to the posteromedial and posterolateral compartments. Diagnostic arthroscopy was completed, and the root tear was identified. A transtibial drill guide (Arthrex) was inserted through the anterior portal. The guide tip was positioned at the center of the posterior horn root footprint. A 3.5-mm wire was inserted through the tibia and then exchanged with a 6 mm–diameter Flip Cutter (Arthrex). The Flip Cutter was used to create a 5 mm–deep socket with exposed bleeding bone.

Three No. 0 Fiberlink (Arthrex), simple cinch (luggage tag) sutures were placed in the meniscus root using a self-retrieving device (Knee Scorpion; Arthrex). These sutures were then pulled through the tibia using a shuttling technique. The sutures were tensioned, and slack was removed by cycling the knee. The sutures were then fixed to the tibia with a knotless suture anchor (4.75-mm Swivelock anchor; Arthrex).

The remaining suture repairs were carried out with an all-inside technique using the FasT-Fix 360 device (Smith & Nephew Endoscopy), deploying a needle-insertion device in a vertical mattress configuration on the superior surface of the meniscus, 3 mm inside the meniscal cut. This device has 2 arrow-shaped polyether ether ketone anchors connected by a No. 2-0 braided, ultra-high-molecular-weight polyethylene suture with a pretied sliding locking knot (Smith & Nephew Endoscopy).

Rehabilitation

The postoperative rehabilitation after isolated meniscal repair included protected weightbearing (touch-down weightbearing) with crutches and range of motion limited to <90° for 3 to 4 weeks. Activities were slowly increased, but no squatting or pivoting was allowed for 4 months. Sports were permitted 4 to 6 months after surgery based on clinical progress.

Patients who underwent partial meniscectomy had no limitation in weightbearing and range of motion exercise when tolerable. In addition, continuous and progressive muscle-strengthening exercises were recommended within the tolerable range for each patient.

Evaluation Methods

All patients underwent routine preoperative and postoperative clinical evaluation as part of standard clinical care. During these visits, demographic data, patient-specific health data, and radiographic data were collected. A review of the extensive and detailed electronic medical records was performed to analyze historical data. Meniscal tears and concomitant injuries were described at the time of arthroscopy. Further, the articular cartilage condition was graded at the time of arthroscopy using the Outerbridge classification, distinguishing patellar chondral surface, femoral chondral surface, and tibial chondral surface. ³⁶ Normal chondral joint surface is graded as 0, whereas grade 4 includes erosion of the articular cartilage that exposes subchondral bone.

Outcome Measures

Objective outcome parameters included reoperation of the repaired meniscus, progression to total knee arthroplasty (TKA), and K-L grade. Postoperative Lysholm, KOOS, and IKDC scores were used for the subjective knee evaluation. These evaluation forms were scored in the standard manner at final follow-up, which was completed for all study patients between May 3 and June 18, 2021.

Patients were considered to have a clinically successful repair if they had no mechanical signs or symptoms, including locking, catching, giving way, or significant swelling, and had no subsequent surgical procedures on the repaired meniscus. Progression to TKA in the period of follow-up was considered failure.

Radiographic assessment of knee arthritis was determined using the K-L grading system. ²¹ Weightbearing anteroposterior knee radiographs were evaluated, and arthritis was graded as none (grade 0), doubtful (grade 1), minimal (grade 2), moderate (grade 3), or severe (grade 4). All postoperative radiographs were obtained for clinical follow-up as part of standard clinical care and were reevaluated by a fellowship-trained orthopaedic surgeon (M.H.) for the purpose of this study.

Statistical Analysis

Rates of failure were estimated at specific follow-up times using the Kaplan-Meier method and were compared between groups using log-rank tests. The effect of continuous variables on risk of failure was assessed using Cox proportional hazards regression. Kaplan-Meier rates were reported with 95% CIs. Analysis was performed using SPSS software (Version 18.0 for Windows; IBM) and JMP Pro (Version 14.1.0; SAS Institute). Statistical significance was set at 5% (P < .05). The independent t test was used to compare continuous variables distributed normally between the groups as well as other numerical values. The Mann-Whitney test was used to compare nonnormally distributed variables between groups and other nonparametric values. The chi-square test was used to compare categorical data, and if >20% of the expected frequencies were >5, the Fisher exact test was used.

Results

The mean follow-up after surgery was 42.2 months (range, 13-128 months). The mean age at surgery was 64.5 years (range, 60-77 years). There were 29 men and 52 women in the total cohort. In total, 59 medial and 22 lateral menisci were treated. There were 45 right and 36 left knees involved. A total of 4 patients were lost to follow-up and were not included in the study. We found no significant difference in demographic characteristics, tear type, or tear location between the groups at baseline. The preoperative K-L grade was not significantly different between the groups (P = .52).

Demographic Characteristics

Baseline demographic characteristics are displayed in Table 1. Radiographical characteristics per study group can be found in Table 2. We found no statistically significant difference between the groups preoperatively and postoperatively regarding the K-L grade. Table 3 displays the meniscal tear characteristics of the groups, and Table 4 provides the mean Outerbridge scores at time of surgery.

Table 1

Demographic Characteristics of the Groups ^a

Characteristic	Repair Group(n = 32)	Meniscectomy Group(n = 49)	P
Sex, male/female, n	12/20	17/32	.82 b
Age, y	64.5 ± 4.6	64.7 ± 4.3	.71 c
Follow-up, mo	39.4 ± 27.9	45 ± 19.2	.52 d
Body mass index, kg/m2	28.9 ± 6.4	29.6 ± 6.6	.65 c

^a Data are presented as mean ± SD unless otherwise indicated.

^b Fisher exact test.

^c Independent t test.

^d Mann-Whitney test.

Table 2

Radiographic Characteristics of the Groups ^a

Kellgren-Lawrence Grade	Repair Group(n = 32)	Meniscectomy Group(n = 49)	P
Grades 0/1/2/3/4, preoperative	2/12/12/6/0	5/24/12/7/0	.52 b
Grade 0/1/2/3/4, postoperative	2/4/6/8/2	1/4/15/11/2	.63 b

^a Data are presented as No. of patients.

^b Fisher exact test.

Table 3

Meniscal Tear Characteristics of the Groups ^a

Characteristic	Repair Group(n = 32)	Meniscectomy Group(n = 49)	P
Tear laterality			>.99 b
Medial	23	36
Lateral	9	13
Tear location			.89 b
Middle body	2	5
Posterior horn	11	17
Root	19	27

^a Data are presented as No. of patients.

^b Fisher exact test.

Table 4

Mean Outerbridge Grades of Chondral Surfaces at the Time of Arthroscopy

	Repair Group(n = 32)	Meniscectomy Group(n = 49)	P
Patella	1.7	1.9	0.2 a
Femoral condyle	1.9	2.0	0.3 a
Tibial plateau	1.3	1.5	0.2 a
Treated compartment	1.5	1.7	0.3 a

^a Fisher exact test.

Clinical Success Rate

The clinical success rate of meniscal repair was 78% overall, with 100% in the patients with meniscal body tears, 82% in the patients with meniscus root tears, and 69% in the patients with posterior horn lesions. Of the 32 patients in the repair group, 7 patients (22%) had repaired menisci that failed after an average time of 19 months (range, 8-46 months). In total, 3 (9%) of the menisci that failed were treated with partial meniscectomy, and 4 (12.5%) progressed to TKA. One patient was reoperated with a partial meniscectomy and progressed to TKA 20 months afterward. Time point of failure was defined as the date of partial meniscectomy. Two of the failed initial repairs occurred in the first 12 months after repair. In the meniscectomy cohort, 9 patients (18%) progressed to TKA and were therefore considered to have experienced failure. A Kaplan-Meier plot with 95% CIs is presented in Figure 2.

Figure 2.

Kaplan-Meier survival analysis from failure of initial operative management resulting in either meniscectomy (repair cohort only) or total knee arthroplasty (repair and meniscectomy cohort).

Outcomes Based on Outerbridge Grade at Arthroscopy

We found no statistical outcome differences regarding clinical success rate between patients with Outerbridge grade 0 or 1 and those with Outerbridge grade 2 or 3 of the whole joint.

In a compartment-specific analysis including only the Outerbridge grade of the treated knee compartment, there were 2 clinical failures in patients of the repair group (n = 12) with an Outerbridge grade 0 or 1 at the time of index arthroscopy. Of the meniscectomy group (n = 9), 1 patient progressed to TKA. In patients of the repair group with Outerbridge grade 2 or 3 (n = 20), 4 clinical failures were recorded, whereas 3 of 40 patients of the meniscectomy group with Outerbridge grade 2 or 3 progressed to TKA.

Patient-Reported Outcomes

PROMs are displayed in Table 5 and Figure 3. At final follow-up, patients in the repair group reported significantly better outcomes with regard to IKDC, KOOS, and Lysholm scores (P < .001 for all). The most significant difference was observed in the KOOS, with a mean ± SD of 86.6 ± 11.9 for the repair group and 61.7 ± 16.2 for the meniscectomy group (P < .001). Of those menisci that clinically failed, PROM scores were 66.8 for IKDC, 74 for KOOS, and 76 for Lysholm. Spearman correlation coefficients were calculated to assess for correlation between PROMs, BMI, and age at procedure (Table 6). The only statistically significant correlation found was a negative correlation between BMI and Lysholm score (Figure 4).

Table 5

Injury Traits and Patient-Reported Outcomes Postoperatively ^a

Characteristic	Repair Group(n = 32)	Meniscectomy Group(n = 49)	P
Tear laterality			>.99 b
Medial	23	36
Lateral	9	13
Tear location			.89 b
Middle body	2	5
Posterior horn	11	17
Root	19	27
IKDC score	78.9 ± 13.4	56.0 ± 15.4	<.001
KOOS	86.6 ± 11.9	61.7 ± 16.2	<.001
Lysholm score	88.3 ± 13.3	68.7 ± 15.2	<.001

^a Data are presented as No. of patients or mean ± SD. Boldface P values indicate statistically significant difference between groups (P < .05). IKDC, International Knee Documentation Committee; KOOS, Knee injury and Osteoarthritis Outcome Score.

^b Fisher exact test.

Figure 3.

Postoperative patient-reported outcome scores. IKDC, International Knee Documentation Committee; KOOS, Knee injury and Osteoarthritis Outcome Score.

Table 6

Spearman Rank Correlation Coefficient of Various Patient-Reported Scores and BMI or Age at Time of Procedure ^a

	BMI		Age at Procedure
Outcome Measure	r S	P	r S	P
IKDC	–0.344	.054	.066	.719
KOOS	–0.268	.139	.124	.500
Lysholm	–0.402	.026	.079	.667

^a Boldface P value indicates statistical significance (P < .05). BMI, body mass index; IKDC, International Knee Documentation Committee; KOOS, Knee injury and Osteoarthritis Outcome Score.

Figure 4.

Scatter matrix of postoperative Lysholm score and body mass index (BMI).

Radiographic Outcomes

Knee radiographs at final follow-up were available in 55 patients and are displayed in Table 2. We found no statistical difference in preoperative rate of osteoarthritis between the groups. The follow-up radiographs showed no significant differences between the repair and meniscectomy groups. Two knees in the repair group progressed from K-L grade 2 preoperatively to grade 4 postoperatively and were treated with TKA.

Discussion

Prior studies have reported good results with meniscal repairs in patients aged ≥40 years. ^8,10 However, no study has specifically addressed the outcome of isolated arthroscopic repairs in the age group of ≥60 years. In this study, we review our clinical experience of arthroscopic repair of isolated meniscal tears in patients ≥60 years and report an overall clinical success rate of 78% for the repair group and 82% for the meniscectomy group. In this context, the most important finding of this study was that the patient-reported outcomes in meniscal repair and meniscectomy cohorts at an average of 42.2 months of follow-up postoperatively differed significantly in favor of the repair group.

The literature provides sparse data regarding PROMs for an older patient cohort with meniscal pathology undergoing meniscal repair. Engler et al ¹⁰ compared IKDC scores between meniscal repair and partial meniscectomy in a cohort of patients aged ≥40 years with meniscal pathology. Those investigators reported no significant differences in IKDC scores between the 2 groups. Further, they found that the average IKDC score of their repair cohort was 78. These average IKDC scores were comparable with average IKDC scores of our meniscal repair cohort (78.9). However, our meniscectomy group reported notably worse outcomes. The Patient Acceptable Symptom State of the IKDC score for patients treated with meniscectomy (57.9) was well-exceeded by patients of the repair group (78.9) but not by patients of the meniscectomy group (56.0). ¹⁴ The difference in IKDC score for the meniscectomy patients might result from age difference and patient selection. Although Engler and coworkers reported a mean age of 52.8 years, our meniscectomy cohort had a mean age of 64.7 years and is more likely to have a lower IKDC score even without any form of treatment.

The Outerbridge grade of the knee joint at time of arthroscopy seemed to be not significantly correlated with the clinical success rate in this study. However, the sample size of our study was not large enough to eliminate confounders and bias in order to reach a statistically significant conclusion. Although less favorable outcomes are often seen with Outerbridge grade 4, these patients were not included in our study. ³⁴ It can be assumed that a meniscal repair procedure is less likely to be performed in the presence of a full-thickness cartilage lesion with the exposure of subchondral bone.

The main biomechanical function of the menisci is to decrease contact pressure by distributing axial load and absorbing shock within the knee. To fulfill this function, the meniscus roots need to be intact and stable to prevent extrusion during compression. ^11,26,39 Meniscus root tears drastically alter native tibiofemoral biomechanics and have similar biomechanical effects to meniscus-deficient knees. Similarly, partial meniscectomy for degenerative root tears significantly alters biomechanics and is associated with a high risk of TKA conversion. ²⁵ Therefore, repair of the meniscus root pathology (n = 46 in the present study) with an aim to reestablish its biomechanical properties is integral to preservation of the native joint biomechanics and longevity of tibiofemoral joint function. ^19,23 The present study demonstrated a significant improvement of clinical joint function in PROMs and a relatively low rate of progression to TKA (12.5% in the repair group and 18% in the meniscectomy group). The conversion rate in the present study was lower than most reported in the literature. However, this study’s follow-up time of 45 months for the meniscectomy group was relatively short.

We report a clinical success rate of 78% after initial arthroscopic repair, with most of the decline in the median survival occurring during the first 22 months (Figure 2). It should be noted, however, that the minimum time of follow-up was 12 months and that the mean time of follow-up was 39.4 months. This time frame is relatively short, and considering that the repair group was subject to postoperative weightbearing and activity limitations whereas the meniscectomy group was released to full activity postoperatively, there is a risk of bias due to different rehabilitation protocols between the groups. Previous studies that analyzed meniscal repair in ligament-stable knees reported a variable clinical success rate between 33% and 76%. ^9,15,29,38 Although previous authors have used patient-reported outcomes to compare meniscectomy and meniscal repair, the current study is the first to our knowledge that specifically examined a patient population of ≥60 years. Xu and Zhao ⁴¹ conducted a meta-analysis comparing both treatments and found improved IKDC score, Lysholm score, and Tegner activity score. However, those investigators excluded publications with patients ≥45 years old, and the reported mean age of the included studies was 22 to 33 years. Dragoo et al ⁸ investigated the outcomes of arthroscopic all-inside repair versus observation in older patients with meniscus root tears. The study size was 48 patients (30 treated, 18 observed) with a mean age of 59.7 years, and the investigators reported improved functional outcomes compared with nonoperative treatment. This is consistent with our study, in which the KOOS for the repair group (86.6) was significantly higher compared with the meniscectomy group (61.7).

Limitations

We note the following limitations. First, this retrospective cohort contains a relatively small group of patients with mixed locations of the meniscal tears. Although the majority of patients in both groups were treated for root tears, the remaining patients were treated for more conventional tears of the meniscal body or posterior horn. However, the procedure of meniscal repair in patients ≥60 years of age remains relatively uncommon, and to our knowledge, this is one of the largest series of isolated tears in the older population to be reported in the literature. Second, no MRI or second-look arthroscopy was performed on asymptomatic patients to assess for clinically silent failures; thus, the failure rate in both groups may have been higher. Previous studies showed that half of asymptomatic patients can have failed repairs at the time of second-look arthroscopy. ³⁷ Third, multiple surgeons performed the meniscal repairs and meniscectomies during a 10-year time period. Fourth, patients were matched by tear location but not by exact tear type, possibly resulting in a mismatch of patients and potentially reducing the comparability of matched pairs. Fifth, the minimum follow-up time in this study was 12 months, which is short compared with other clinical outcome studies. Due to this time frame, final follow-up was conducted in some patients of the repair group only 6 months after full release to activity, whereas it was 12 months after release for the matched patients of the meniscectomy group.

Conclusion

Meniscal repair led to significantly higher patient-reported outcome scores compared with partial meniscectomy in a cohort matched based on patient characteristics. Further studies are needed to help define the ideal treatment for patients with a meniscal tear based on their clinical, demographic, and radiographic characteristics.