Long-term outcome in 44 horses with stifle lameness after arthroscopic exploration and debridement.

This study examines the long-term outcomes for 44 horses with stifle lameness, a knee joint disorder, following arthroscopic exploration and debridement, a type of surgery. Key determining factors were studied that could potentially affect the prognosis of the horses, and results indicated that the age of the horse, severity of lameness, radiographic changes and the presence of large meniscal tears were predictors of a negative postoperative outcome.

Methods and Participants

• The research studied 44 horses with lameness localized to the stifle, diagnosed with osteoarthritis, meniscal tears or other intra-articular soft tissue injuries based on an arthroscopic examination.
• Excluded from the study were horses with osteochondrosis lesions, intra-articular fractures, or osseous cyst-like lesions.
• The researchers reviewed medical records of these horses that had undergone arthroscopic exploration.
• Pertinent case information was analyzed for both short-term and long-term outcomes.

Results and Findings

• There was no significant connection found between radiographic score and surgery score.
• Diagnostic ultrasound had a sensitivity of 79% and specificity of 56% for identifying meniscal injuries.
• Follow-up data was available for 35 horses out of the total 44. Of these, 60% exhibited improvement following surgery, while 46% became sound, and 37% were able to return to their previous level of function.
• A negative association was established between the age of the horse, the severity of preoperative lameness and outcome. This means that older horses and those with more severe lameness were more likely to have poor postoperative outcomes.
• Severe changes observed on preoperative radiographs were also negatively linked with prognosis.
• It was also noted that no horses with grade 3 meniscal tears showed improvement postoperatively and increased meniscal damage was negatively associated with return to previous function.
• A weak link was observed between surgery grade and outcome. The extent of chondral damage, the location of the primary pathology, and microfracture techniques did not affect the outcome.

Conclusions

• The study concluded that a negative postoperative outcome for horses with stifle lameness is associated with factors such as the horse’s advanced age, severe lameness, evident radiographic changes, and the presence of large meniscal tears.
• The appearance of the articular surface at the surgery did not consistently indicate prognosis.
• Despite having extensive cartilage damage, some horses were able to return to athletic function after arthroscopic debridement and lavage.
• Older horses, those with severe preoperative lameness, and ones with severe radiographic changes or large meniscal tears may be given a pessimistic prognosis.