Outcomes of the Medial Femoral Trochlea Osteochondral Free Flap for Proximal Scaphoid Reconstruction

Abstract

To describe the radiographic, functional, and patient-reported outcomes (PROs) of medial femoral trochlea (MFT) osteochondral free flap reconstruction of the proximal scaphoid at approximately 2 years follow-up. Eleven patients who underwent MFT reconstruction of the proximal scaphoid returned for clinical examination, radiographs, and completion of PROs questionnaires. For another 10 patients who were unable to return, data were gathered remotely or from the medical record. Mean radiographic follow-up was 2.0 years and mean examination follow-up ranged from 2.6 to 2.8 years. Mean follow-up for several PROs ranged from 2.8 to 2.9 years. On average, carpal collapse did not progress, and radiolunate angle was significantly improved by 9.5°. Wrist flexion (41.6°; -6%) and extension (43.8°; -7%) were only slightly changed, and dominance-corrected postoperative pinch and grip strength were 77% and 72% of the uninjured side, respectively. Mean postoperative Disabilities of the Arm, Shoulder, and Hand (DASH) score was 10.7. In patients with both pre- and postoperative scores available, DASH significantly improved by 15 points. Knee donor-site morbidity was measured on the Knee Injury and Osteoarthritis Outcome Score (KOOS)-Sports and Recreation and the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scales. The Patient-Reported Outcomes Measurement Information System (PROMIS) Global Health, Physical Function, Pain Intensity, Pain Interference, and Pain Behavior scores reflected good postoperative patient health and function and low pain levels. Higher body mass index (BMI) was found to be predictive of inferior lower extremity and global PROs. An MFT reconstruction of proximal scaphoid nonunion has the potential to restore normal functional radiocarpal anatomy, improve function, and relieve pain without causing wrist stiffness or weakness. Donor-site morbidity has been further delineated in this study. Caution is warranted when considering this procedure in patients with elevated BMI because they may be at increased risk for donor-site morbidity. Therapeutic IV.