Flexor Tendon Tenolysis: Indications, Anatomy, and Outcomes Post-Repair
Key Takeaway
Flexor tendon tenolysis is a secondary surgical procedure performed after primary flexor tendon repair to release restricting peritendinous adhesions. These adhesions limit tendon gliding, causing stiffness and reduced range of motion. Tenolysis aims to surgically restore tendon excursion and improve digital movement when non-operative hand therapy fails.
You are presented with a 32-year-old patient who underwent a primary Zone II flexor tendon repair 5 months ago. They have completed formal hand therapy but have plateaued in their recovery. They present with a 45-degree lag at the PIP joint and limited active flexion, despite full passive range of motion. Examination reveals a mature, quiescent scar. What is your management plan?
Candidate: I would suspect peritendinous adhesions. I would discuss the option of a formal tenolysis with the patient. Given the patient has good passive ROM and a mature scar at 5 months, they are a good candidate. I would consent them for the risk of rupture, infection, CRPS, and the high chance of re-adhesion. Post-operatively, they would require immediate, intensive hand therapy.
Candidates often jump straight to surgery without emphasizing the necessity of confirming tendon integrity or failing to explicitly mention that the goal is to restore active motion, assuming the reader knows why the surgery is needed. They may also neglect to mention the importance of the patient's psychological state and compliance.
A structured response is essential: 1. Confirmation: Confirm tendon continuity (via exam/imaging if needed) and verify PROM matches the joint capacity, confirming adhesion is the limiting factor. 2. Patient Factors: Ensure scar maturity (>3-6 months), absence of active infection, and evaluate patient motivation/compliance. 3. Surgical Goal: Explain the aim is to release extrinsic adhesions to restore tendon excursion while protecting the pulley system (A2/A4) and neurovascular bundles. 4. Rehabilitation: Emphasize that surgery is only 50% of the solution; success depends on immediate, aggressive post-operative therapy to prevent secondary scarring.
During your tenolysis, you encounter significant scarring in "No Man's Land." You are worried about the integrity of the A2 pulley. How do you assess and manage this intra-operatively?
Candidate: I would prioritize the preservation of the A2 and A4 pulleys as they are the primary mechanical anchors preventing bowstringing. I would perform a gentle circumferential lysis using fine instruments like a Mühldorfer knife under magnification. If the pulley is severely scarred, I might perform a partial longitudinal release, but I would avoid full transection unless absolutely necessary for tendon excursion.
Candidates often fail to describe the dynamic assessment. Simply releasing scar tissue is not enough; you must test the tendon excursion before and after releasing each adhesion to ensure you aren't releasing pulleys that are actually functional, which would lead to iatrogenic bowstringing.
A high-scoring answer focuses on the "Preservation vs. Excursion" trade-off. Mention: 1. Magnification: Use loupes/microscope. 2. Incremental Release: Perform limited longitudinal pulley release only if the tendon is physically constrained. 3. Dynamic Testing: Assess for bowstringing by checking the tendon trajectory during passive digit flexion. 4. Reconstruction threshold: If significant pulley function is lost, acknowledge the need for potential secondary reconstruction using a free tendon graft (e.g., palmaris longus), though this is a last resort.
