Influence of Subchondral Cysts on the Outcomes of Surgical Treatment for Osteochondral Lesions of the Talus: A Systematic Review and Meta-analysis

Concomitant Chronic Lateral Ankle Instability Affects Postoperative Functional Outcomes in Patients With Osteochondral Lesions of the Talus but Does Not Affect Cartilage Repair After Restoration of Ankle Stability

PURPOSE

To investigate the effect of concomitant chronic lateral ankle instability (CLAI) on postoperative clinical outcomes in patients with osteochondral lesions of the talus (OLTs).

METHODS

Patients who underwent surgery for OLTs between January 2018 and May 2022 were retrospectively evaluated. OLT patients underwent debridement, microfracture, or bone grafting, whereas patients with concomitant CLAI underwent lateral ligament repair or reconstruction. Functional assessments included the visual analog scale score, American Orthopaedic Foot & Ankle Society (AOFAS) score, Foot and Ankle Outcome Score (FAOS), and Tegner score, with a minimum follow-up of 24 months. Cartilage repair was evaluated using Magnetic Resonance Observation of Cartilage Repair Tissue (MOCART) 1 and MOCART 2.0 scores based on postoperative magnetic resonance imaging. Additionally, multiple linear regression analysis was performed to explore the effects of potential factors, and Spearman correlation coefficients (rs) were calculated to assess the relationship between these factors and outcome scores.

RESULTS

A total of 85 patients were included, with 39 in the OLT group and 46 in the OLT-CLAI group. The mean follow-up times were 46.95 ± 17.00 months (range, 24-76 months) and 41.80 ± 15.10 months (range, 24-76 months), respectively (P = .347). Compared with the OLT group, the OLT-CLAI group showed lower postoperative AOFAS and FAOS scores, with a significantly smaller overall improvement in the AOFAS score (P < .05). There was no significant difference in the number of patients achieving the minimal clinically important difference in functional scores between the groups. Multiple linear regression analysis showed that CLAI surgery negatively affected postoperative AOFAS (standardized β = -0.344, P = .001) and FAOS (standardized β = -0.332, P = .001) scores, with Spearman analysis indicating a moderate correlation (rs = -0.442 [P < .001] and rs = -0.339 [P = .002], respectively). No significant differences were observed between the groups in terms of MOCART 1 (61.52 ± 12.38 vs 65.89 ± 14.47) or MOCART 2.0 (68.70 ± 16.53 vs 73.75 ± 14.76) scores (P > .05), and multiple linear regression as well as Spearman analysis did not yield positive results.

CONCLUSIONS

OLT patients with concomitant CLAI had lower postoperative functional outcomes than those without CLAI. However, after surgical treatment of CLAI, cartilage repair in OLT patients was not affected.

LEVEL OF EVIDENCE

Level III, retrospective comparative study.

Autologous osteoperiosteal transplantation is effective in the treatment of single cystic osteochondral lesions of the talus and the prognostic impact of age should be emphasized

PURPOSE

To investigate the clinical efficacy and prognostic factors associated with autologous osteoperiosteal transplantation for the treatment of single cystic osteochondral lesions of the talus (OLT).

METHODS

The clinical data of patients with single cystic OLT undergoing autologous osteoperiosteal transplantation at the Department of Foot and Ankle Surgery of our hospital between 2018 and 2022, including complete follow-up, were retrospectively analyzed. Imaging data from each patient were imported into Mimics software to measure the surface area, volume and depth of the lesions. Then, the talus nine-compartment partitioning method was used to partition the injury site. Preoperative and final follow-up assessments were performed using the American Orthopaedic Foot and Ankle Society (AOFAS) score, visual analogue scale (VAS) for pain and 36-item Short-Form Health Survey (SF-36) to evaluate treatment efficacy and analyze prognostic factors.

RESULTS

Of the 31 patients with single cystic OLT with a complete set of follow-up data, there were 17 males and 14 females, with a mean age of 43.3 ± 13.6 years, a mean follow-up time of 30.1 ± 14.0 months and a mean illness duration of 30.4 ± 20.0 months. The postoperative final follow-up AOFAS score was 90.7 ± 5.5; this represented significant improvement when compared to the preoperative score of 57.0 ± 8.5 (P < 0.001). The final postoperative follow-up VAS score was 18.5 ± 8.3; this was significantly better than the preoperative score of 57.8 ± 8.7 (P < 0.001). The physical component summary (PCS) score and mental component summary (MCS) score on the SF-36 scale showed significant improvement at the final postoperative follow-up when compared to preoperative scores (p < 0.001). No other complications were observed during follow-up, such as wound infection or pain at the donor site. One of the patients showed less improvement, which may be related to premature weight-bearing or re-sprained ankle after surgery. There was no significant correlation between the duration of illness, gender and the location, depth, surface area and volume of the OLT and the postoperative scores. However, patient age showed a significant negative correlation with the postoperative SF-36 PCS and MCS scores.

CONCLUSION

Autologous osteoperiosteal transplantation for single cystic OLT demonstrated good clinical efficacy with a low incidence of complications. Furthermore, age represents an important factor influencing prognosis.

LEVEL OF EVIDENCE

Level II.