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Routine target for posterior tibial slope recreates slope in patients undergoing UKA
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When attempting to recreate the preoperative tibial slope among patients undergoing medial or lateral unicompartmental knee arthroplasty, a routine target of 5° to 7° will produce a posterior slope less than the patient’s native anatomy in 47% of patients, researchers found.
The researchers retrospectively reviewed 2,395 CT scans, including 2,031 knees that underwent medical unicompartmental knee arthroplasty (UKA) and 364 knees that underwent lateral UKA, acquired during the design phase for a patient-specific UKA.
The researchers measured the posterior tibial slope (PTS) of the osteoarthritic compartment relative to a plane set perpendicular to the sagittal, tibial mechanical axis.
Among patients who underwent medial UKA, results showed a mean preoperative PTS of 6.8°, with 34.3% between 4° and 7°, whereas patients undergoing lateral UKA had a mean preoperative PTS of 8°, with 27.5% between 4° and 7°.
“This study demonstrates a wide variability of PTS in patients undergoing UKA, and future directions must focus on the impact of altering a patient’s native PTS on the clinical outcomes following UKA,” the researchers concluded.
Disclosure: See full study for all authors’ relevant financial disclosures.
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