Overview
Research Article Title: Impact of Branched-Chain Amino Acid Supplementation on Postoperative Serum Albumin Recovery in Older Adults with Hip Fracture: A Propensity Score-Matched Study
Authors: Kang SY, Loh LL, Kim HS, and Yoo JJ.
Published in: Journal of Clinical Medicine
Date of Publication: November 28, 2025
Link to Article →
Summary
Older adults with hip fractures commonly experience poor nutritional status, including low serum albumin levels, which are associated with increased postoperative complications and suboptimal recovery. Branched-chain amino acids, or BCAAs, are essential nutrients that may help stimulate protein synthesis and support the recovery of albumin levels. However, their effect in the context of hip fracture recovery has not been well established.
This study aimed to evaluate whether postoperative BCAA supplementation influenced serum albumin recovery in older adults following hip fracture surgery.
Key Findings
- Serum albumin levels increased significantly more in the BCAA group than in the matched control group at six weeks after surgery, suggesting enhanced albumin recovery with BCAA supplementation.
- There were no significant differences between the groups in length of hospital stay, blood transfusion rates, or incidence of postoperative delirium.
Methodology
This retrospective study was conducted at a tertiary referral center and included patients who sustained hip fractures between January 2022 and November 2023.
After propensity score matching was used to balance clinical and demographic characteristics, 106 patients were analyzed. This included 53 patients who received BCAA supplementation and 53 matched controls who received standard care without BCAA supplementation.
BCAAs were administered three times daily for six weeks following surgery. Serum albumin levels were measured before surgery and again six weeks after surgery.
BCAA Supplement Breakdown
Each packet contained 4 grams of BCAAs:
- L-leucine: 1,904 mg
- L-isoleucine: 952 mg
- L-valine: 1,144 mg
Why It Matters
Practical guidelines for geriatric care recommend routine nutrition screening, individualized nutrition care plans, and adequate protein intake for older hospitalized patients. These guidelines also emphasize delirium prevention and continuity of rehabilitation.
Major trauma and hip fracture surgery can trigger a hypercatabolic and pro-inflammatory state in older adults that may continue for weeks or months. This can contribute to anabolic resistance and delay the recovery of visceral and muscle proteins.
One-year mortality following a hip fracture has been reported to be as high as 20% to 30%, and long-term disability is common.
Primary outcome: Change in serum albumin levels from before surgery to six weeks after surgery.
Secondary outcomes: Length of hospital stay, need for blood transfusion, and incidence of delirium during hospitalization.
Limitations
The findings of this study should be interpreted with caution, as long-term outcomes are likely influenced by multiple concurrent factors rather than adjunctive nutritional support alone.
- The lack of randomization means that residual selection bias may still exist.
- The retrospective dataset relied on serum albumin as the sole biochemical nutrition marker.
- Prealbumin levels and results from a validated nutrition screening tool were not collected or analyzed, limiting the detail of the baseline nutritional assessment.
- Vitamin D deficiency frequently accompanies sarcopenia and may impair both muscle and bone health, but vitamin D status was not included among the biochemical nutrition markers evaluated.
Final Thoughts
The results of this study suggest that targeted nutritional support, particularly BCAA supplementation, may contribute to improved serum albumin recovery in older adults following hip fracture surgery.
These findings highlight the potential role of targeted nutritional support in this vulnerable population. However, larger prospective studies are needed to confirm the clinical benefits and determine whether BCAA supplementation meaningfully affects broader recovery outcomes.
The study also reinforces the need for standardized nutritional assessment and individualized nutrition interventions following orthopedic trauma.
This article was written by Katie Frushour, MS, RD, CSSD, a dietitian at Mend.
