Trial reportInternational orthopaedics2026
The effect of J-shaped incision versus standard midline incision on numbness and pain in primary total knee arthroplasty: a prospective randomized controlled trial.
Trial report in International orthopaedics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07514598 (J-Shaped Incision Reduces Peri-incisional Numbness and Pain After Primary Total Knee Arthroplasty), which is not on this map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
J-Shaped Incision Reduces Peri-incisional Numbness and Pain After Primary Total Knee Arthroplasty: A Prospective Randomized Controlled Trial
Who cites it
0 citing papers in PubMed.
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Corrections and comments
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionPeri-incisional numbness is a common but often underestimated complaint after primary total knee arthroplasty (TKA) and may negatively affect early postoperative patient satisfaction. This randomized controlled trial aimed to determine whether a modified J-shaped skin incision, created by lateralizing the distal limb of the standard midline incision by 3 cm at the tibial tuberosity, reduces peri-incisional numbness and pain after primary TKA. MATERIALS AND
methodsSixty-two patients undergoing primary TKA for Kellgren-Lawrence grade 4 osteoarthritis were randomized to either a standard midline incision or a modified J-shaped incision. All procedures were performed using a medial parapatellar arthrotomy and standardized perioperative protocols. The primary outcome was the area of postoperative anterior knee numbness, assessed using grid-based 10-g Semmes-Weinstein monofilament mapping at two and six months. Secondary outcomes included VAS pain, WOMAC, KOOS, HSS, Kujala score, range of motion, and perioperative parameters.
resultsBaseline demographic and perioperative characteristics were comparable between groups, except for longer incision length in the J-shaped group. The standard incision group had a significantly larger sensory deficit area than the J-shaped group at both two months and six months postoperatively (7.6 ± 4.2 vs. 3.5 ± 2.9 cm.
conclusionsThe modified J-shaped skin incision significantly reduced peri-incisional numbness and early postoperative pain after primary TKA without increasing complications. This simple incision modification may improve early sensory recovery while preserving standard medial surgical exposure.
trial registrationClinicalTrials.gov, NCT07514598, ( https://clinicaltrials.gov/study/NCT07514598 ).
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