Lower extremity osteotomies for limb preservation: Indications, outcomes, and risk factors

To delineate the key factors associated with treatment success or failure for patients undergoing lower extremity osteotomies to address a spectrum of lower extremity joint and limb deformities at an Integrated Limb Preservation Center (ILPC).

Design: Retrospective cohort study. Setting: Level I Academic Trauma Center. Patient selection criteria: Patients of the ILPC with at least 1-year of follow-up data regarding previous surgery to correct trauma-or developmental-related deformities between January 1, 2005, and October 1, 2022. Outcome measures and comparisons: Patients were categorized first based on etiology (developmental vs. traumatic) and then based on the nature of deformity (joint, limb, nonunion). Treatment data, demographics including age, sex, body mass index (BMI), tobacco use history, insurance status, marital status, mental health history, and history of comorbidities, concurrent procedures, and post-operative infection, revision, reoperation, and bone healing status were extracted from the medical record and compared. Treatment failure was defined as conversion of the limb preservation surgery (ies) to amputation of any type.

139 patients were included for analysis; 47 patients in the developmental-related cohort, and 92 patients in the trauma-related cohort. The treatment success rate in terms of preserving the affected limb for patients undergoing lower extremity osteotomies was 94.7 % for the developmental-related cohort and 92.4 % for the traumatic-related cohort. 57.4 % of patients in the developmental-related cohort and 59.8 % of patients in the trauma-related underwent unplanned secondary procedures Concurrent osteomyelitis debridement (p = 0.01) and postoperative infection (p = 0.049) were the only factors measured significantly associated with conversion to amputation.

Patients undergoing osteotomies at an ILPC to address developmental-related or trauma-related joint and/or limb deformities experienced high short-term success (>90 %) with respect to preserving the affected limb. However, 56 % of patients required subsequent unplanned surgeries and improvements in PROMs were only statistically significant in patients with trauma-related deformities.

III.