A quantitative histologic comparison: ACL degeneration in the osteoarthritic knee

Fred D Cushner¹, David F La Rosa, Vincent J Vigorita

¹Insall Scott Kelly Institute for Orthopaedics and Sports Medicine, Beth Israel Medical Center-Singer Division, New York, New York, USA.

|September 27, 2003

Summary

Osteoarthritis significantly degenerates the anterior cruciate ligament (ACL), impacting knee replacement outcomes. Histological analysis revealed moderate to marked ACL degeneration in 47% of osteoarthritis patients, unlike healthy controls.

Area of Science:

Orthopedic Surgery
Histopathology
Biomaterials Science

Background:

Newer total knee arthroplasty (TKA) designs and unicondylar TKAs preserve the anterior cruciate ligament (ACL).
Successful ACL-sparing knee replacements depend on near-normal ACL function.
The histological characteristics of the arthritic ACL are not well-documented.

Purpose of the Study:

To histologically evaluate the ACL for microscopic evidence of degeneration in patients with severe osteoarthritis.
To compare the histological features of ACLs from osteoarthritic knees with those from control groups.

Main Methods:

Nineteen ACLs were harvested from patients undergoing TKA for severe osteoarthritis.
Control ACLs were obtained from bone bank donors, amputations, and cadavers.
ACLs were histologically scored for degenerative parameters like fibrous connective tissue, myxoid changes, cystic occurrences, chondroid metaplasia, and calcium phosphate crystals.

Main Results:

47% of the osteoarthritic ACL group showed moderate to marked degeneration, compared to 0% in controls.
72% of control ACLs were normal, versus only 26% in the osteoarthritic group (P<.001).
Younger osteoarthritic patients (<65 years) exhibited higher rates of degeneration (70%) than older patients (22%, P<.05).

Conclusions:

Severe osteoarthritis is associated with significant histological degeneration of the ACL.
ACL degeneration is more prevalent and severe in younger osteoarthritic patients.
These findings highlight the compromised state of the ACL in osteoarthritis, potentially affecting outcomes of ACL-sparing TKA.

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Related Experiment Videos

A quantitative histologic comparison: ACL degeneration in the osteoarthritic knee

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

Related Concept Videos

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